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2011 Vol.28(2)

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Global food and agriculture crisis and the pratacultural systematic engineering in China
Yu-Tang LI
2011, 5(2): 171-175.
[Abstract](1408) [PDF 750KB](793)
Abstract:
Based on the global food crisis and key affecting factors, the potential food and agricultural production crisis and the impacts of its different two developing patterns on food requirement in the world were discussed in this study. This study proposed that the creative developing road, namely pratacultural systematic engineering, was the only way to agriculture in China. Based on presenting the theoretical and scientific principles, this study proposed the core techniques in the pratacultural systematic engineering, and pointed out that the creative road of agricultural development in China would play an active role in alleviating food pressure throughout the world in the future.
Grade appraisement of grassland resource in Hebei Province
2011, 5(2): 176-179.
[Abstract](1315) [PDF 447KB](814)
Abstract:
In order to achieve the dynamic state of grassland resources in Hebei Province, the data of openair grassland survey of 110 plots,330 quadrats were obtained from 2005 to 2007.Based on grassland vegetation yield, palatability and utilization characters, the rangeland grades in Hebei Province were appraised.Results from this study indicated that: 1) The percentages of grade Ⅰ,Ⅱ,Ⅲ,Ⅳ and Ⅴin the investigated grassland plots were 0.91%, 13.64%, 31.82%, 30.91% and 22.73% respectively.The proportion of grades Ⅲ and Ⅳ, total 67.73% in the investigated grassland plots, was bigger than that of others.Different grassland types had significant different grassland grades.The temperate steppe and warm temperate tussock could be classified into grade Ⅲ and Ⅳ; the temperate meadow and mountain meadow belonged to grade Ⅲ, Ⅳand Ⅴ; the warm temperate shrubgrassland and lowland meadow were grade Ⅳand Ⅴ; and the land marsh grassland were put into grade Ⅳ.2) The proportion of grassland classified into level 1 to 8 was 7.27%、4.55 %、11.82 %、15.45%、27.27%、14.55%、10.91% and 8.18% respectively.3)Comparison with the appraisement results of grassland grades in the 1980s, the proportion of gradeⅠandⅡgrassland decreased; grade Ⅲ, Ⅳ andⅤ increased; the proportion of level 1 to 4 reduced, level 5 to 8 elevated; overall grassland resources in Hebei Province showed an worsening trend.
Life histories of endangered Astragalus membranaceus population
2011, 5(2): 180-184.
[Abstract](1520) [PDF 623KB](856)
Abstract:
Astragalus membranaceus is one of the endangered species in China.Analytical methods of the population structure, life table, survival functions are used to study life histories of A.membranaceus population in Xishui forest area of middle Qilian Mountains.The study showed that the population was declining gradually and individual plants of class I were not enough; the survival curve of the population appeared to be a type of Deevey Ⅱ; curves of survivorship, mortality rate, killing value reflected the whole population trends of dynamic changes; and functions of survival rate, cumulative mortality rate, mortality density and hazard reflected dynamic and structure of A.membranaceus population.Grazing and digging medicinal materials are main factors in imminent danger of the population.
Characteristics of biomass allocation of Cenchrus pauciflorus under arid and irrigated habitats
2011, 5(2): 185-188.
[Abstract](1437) [PDF 483KB](832)
Abstract:
Characteristics of biomass allocation of Cenchrus pauciflorus were investigated in arid and irrigated habitats in Korqin sandy land. Ramet height and biomass, biomass of root, stem, leave, spikes and sheath were measured respectively. The study showed that ramet height of C. pauciflorus in the wet condition was 41.2 cm, which was significantly taller than that in the arid condition, 33.7 cm. In the irrigated habitat, the biomass of spikes was 1.8 times of that in arid habitat. Within the two habitats, the biomass of root, stem, leave and sheath were positively significantly correlated with ramet biomass (P0.01) and marked a regular pattern of power function of y=axb; the biomass of root, stem, leave and sheath were also positively significantly correlated with each other (P0.05), which accords with the linear rule of y=ax+b. In the wet condition, the growth rate of module biomass is higher than that in the arid condition with the increasing of ramet biomass. The analysis concluded that C. pauciflorus took the strategy of survival in the arid habitat, and the countermeasure of competition and breeding growth in the wet habitat.
Effects of soil managements on soil physical and chemical properties of the apple orchard in the South of Xinjiang
2011, 5(2): 189-193.
[Abstract](1536) [PDF 552KB](973)
Abstract:
In order to provide information of soil management mode in apple orchards, a field experiment was conducted with different treatments in the South of Xingiang. Treatments of the experiment included covering with straw, notillage, grass interplanted and clean tillage (CK) in apple orchards, respectively. The results of this study indicated that the treatments reduced the soil bulk density and increased the soil porosity in the certain extent compared with CK. The order of soil water contents under different treatments were covering with strawgrass interplantednotillageCK. The three treatments all increased the soil organic matter contents in 0-40 cm soil layers. The soil organic matter of the top soil layer was increased more significantly than that of the deeper soil layer. Soil available nutrients with treatments were higher than that with CK, but the total nitrogen content with grass interplanted decreased compared with CK in 0-20 cm soil layers. The order of total nitrogen contents of soil under different treatments were notillagecovering with strawCKgrass interplanted. The changes of total phosphorus and potassium contents in soil were similar, in which were grass interplantednotillagecovering with strawCK. The effects on the surface soil layer were more significantly.
Ji-Zhou LIN
2011, 5(2): 194-195.
[Abstract](1224) [PDF 349KB](1606)
Abstract:
Investigation and collection of wild forage germplasm resource in Jilin Province
2011, 5(2): 196-200.
[Abstract](1403) [PDF 543KB](808)
Abstract:
In order to provide information on the conservation, research and development of wild forage germplasm resources, a total of 191 germplasm resources of valuable wild forages were collected during 2008-2009 in Jilin Province. The results of this study showed that the 191 germplasm resources covered 18 families, 59 genera, 89 species, of which 91 were Leguminosae, 64 were Gramineae and 36 were other sections. In these wild forage germplasm samples there were not only unique local wild species and a number of adaptable, widely distributed, variations in species, but also wild species and wild relative species of excellent cultivated grasses in different habitats. Distribution of some key genera and species,and their relationships with habitat condition were also summarized. This study provided abundant wild forage germplasm resources for screening and cultivation of new varieties of grasses, and important scientific information on wild grass germplasm resource conservation, development and utilization.
Study on constructed AtPCS1 plant expression vector and transformation of Medicago sativa
2011, 5(2): 201-206.
[Abstract](1625) [PDF 612KB](842)
Abstract:
The full length of AtPCS1 gene was amplified from Arabidopsis thaliana (ecotype Columbia), and AtPCS1 plant expression vector pBI121AtPCS1 was constructed. Furthermore, the expression vector was transferred into Agrobacterium EHA105, and AtPCS1 was transferred into alfalfa (Medicago sativa) Gannong No.1 by leaf infection method. Fiftyseven transgenic alfalfa plants have been obtained after a period of 80-100 d after transformation.Six in nine random chosen plants were positive transgenic plants identified by AtPCS1specific PCR. Results from this study showed that AtPCS1 has been transferred into genome of alfalfa.
Study on constructed AtPCS1 plant expression vector and transformation of Medicago sativa
2011, 5(2): 207-216.
[Abstract](10128) [PDF 251KB](19276)
Abstract:
The full length of AtPCS1 gene was amplified from Arabidopsis thaliana (ecotype Columbia), and AtPCS1 plant expression vector pBI121AtPCS1 was constructed. Furthermore, the expression vector was transferred into Agrobacterium EHA105, and AtPCS1 was transferred into alfalfa (Medicago sativa) Gannong No.1 by leaf infection method. Fiftyseven transgenic alfalfa plants have been obtained after a period of 80-100 d after transformation.Six in nine random chosen plants were positive transgenic plants identified by AtPCS1specific PCR. Results from this study showed that AtPCS1 has been transferred into genome of alfalfa.
Evaluation on drought resistance of different alfalfa cultivars at seedling stage and comparison of the evaluating methods
2011, 5(2): 217-225.
[Abstract](1370) [PDF 620KB](822)
Abstract:
As the methods of the drought resistance evaluation of alfalfa (Medicago spp.) in the home and abroad were nonuniform, two experiments on evaluations (with two different water stress) of drought resistance of 133 different alfalfa varieties collected from China or abroad were conducted and the methods of two different water stress were compared and modified in the study. The results of drought resistance of alfalfa base on two variables, which were the symptom index of drought response (average score index, ASI) and the survival rate after rewatering, were analyzed by using the SAS software. The results of this study indicated that 15 of 133 alfalfa varieties showed strong drought resistance and 11 varieties had the weakest drought resistance steadily; there was no significant difference (P0.05) between the two evaluation results; and the germination index of alfalfa showed a significant negative correlation with drought resistance in the first time (P0.01) and in the second (P0.05) evaluation, respectively.
Embryo rescue culture of selfing S1 generation multifoliate alfalfa
2011, 5(2): 226-230.
[Abstract](1611) [PDF 577KB](907)
Abstract:
Three alfalfa (Medicago sativa) plants of selfing S1 generation with multifolate characteristics were used to study embryo abortion rate of alfalfa inbred lines and effect of best sampling time and different levels of hormone on embryo rescue. The results pf this study showed that the average abortion rate of embryos was 37.59%. The best sampling time of embryo rescue culture was 30 d after pollination. The optimum medium of embryo rescue culture was MS medium containing 0.5 mg/L IAA and 0.07 mg/L 6BA+sucrose 30 g/L+agar 7 g/L, and pH 5.8-6.1. The average induction and differentiation rate of embryogenic callus were 85.32% and 75.66%,respectively. This study provided a theoretical basis of embryo rescue and an effective solution of low selfing fruitful rate of multifoliate alfalfa.
Preliminary study on abundance and deficiency index of available phosphorus and potassium for alfalfa in Bashang soil
2011, 5(2): 231-235.
[Abstract](1652) [PDF 586KB](743)
Abstract:
Seventeen soil samples collected from different areas of Bashang region were analyzed for their soil fertility levels in the laboratory. Five samples which had different soil fertility from 17 soil samples were chosen for pot experiments to study on the abundance and deficiency index of available phosphorus and potassium for Medicago sativa. Treatments of the experiments were included well fertilized (added right amount of N, P, K), phosphate deficiency (added right amount of N, K), potassium deficiency (added right amount of N, P) and no fertilized (did not add N, P, K). The results of this study showed when M. sativa was planted in Bashang soil, the indexes of available phosphorus in the soil at serious deficiency, deficiency, no deficiency, abundance and great abundance were 3.5, 3.5-9.8, 9.8-21.4, 21.4-27.7 and 27.7 mg/kg, respectively. The indexes of available potassium in the soil at serious deficiency, deficiency, no deficiency, abundance and great abundance were 2.4, 2.4-15.6, 15.6-63.4, 63.4-101.2 and 101.2 mg/kg, respectively.
Effects of petroleum contamination on some of physiological indexes of alfalfa
2011, 5(2): 236-240.
[Abstract](1625) [PDF 587KB](798)
Abstract:
In order to understand the phytoremediation mechanism of alfalfa (Medicago sativa) in petoleum contaminated soil, a variety Yuedongzhixing of alfalfa and soil contaminated with varying petroleum concentration were used for pot experiments. Treatments of the experiments were included non contaminated soil (CL0), non contaminated soil with 2 500 (CL1),5 000 (CL2) and 7 500 (CL3) mg/kg of petroleum, respectively. Results from this study showed that pertoleum contaminated soil inhibited alfalfa growth significantly; so that plant height, leaf numbers, the dry matter acucumulation of aerial parts and roots of alfalfa decreased significantly with increasing of petroleum contamination in soil compared with non contaminated soil. Soluble protein, starch and malondialdehyde (MDA) contents in leaves of alfalfa increased firstly at low petroleum contamination, and then decreased with the increasing of petroleum contamination in soil. The soluble protein content in leaves declined at petroleum contamination above 7 500 mg/kg in soil at very beginning. The starch and MDA contents reached the highest level with the petroleum contamination at 5 000 and 2 500 mg/kg in soil, respectively. Chlorophyll content in leaves of alfalfa treated with different concentration of petroleum increased differently compared with non contaminated soil.
The relationship of different seed coat color and seed yield component of Sorghum sudanense cv. Qita
2011, 5(2): 241-244.
[Abstract](1825) [PDF 433KB](765)
Abstract:
In order to explore the influence of different seed coat color (black, red and yellow)on seed yield, the period of procreation, seed morphology and seed yield structure of Sudan grass (Sorghum sudanense cv. Qitai) were analyzed in the study. The results of this study showed that the weight of one thousand seeds with black, red and yellow theca were 14.66, 13.36 and 12.77 g (blackredyellow); the seed numbers of single tassel seed with black, yellow and red theca were 1 319, 1 217 and 908 pills (blackyellowred); the single tassel seed yield with black, yellow and red theca was 18.59,16.29 and 14.65 g (blackyellowred); and the total yield of seeds with black, red and yellow were 3 593.52, 2 654.89 and 2 649.60 kg/ha (blackredyellow),respectively.
Effects of salinealkaloid stress on the seed germination of Achantherum splendens
2011, 5(2): 245-250.
[Abstract](1604) [PDF 566KB](853)
Abstract:
The effects of five salinealkaloid (NaCl, Na2SO4, NaHCO3, Na2CO3 and a mixed solution of them at the ratio of 1∶9∶9∶1) in different concentrations on Achnatherum splendens seed germination were studied in this paper. The results of this study showed that the germination percentage, germination index and germination energy were decreased with the increase of salt concentration and the rejection capability was gradually increased on the seed germination. Low concentrations (80 mmol/L) of NaHCO3 and the mixture can promote seed germination. The order of rejection capability of five salinealkaloid was carbonatesalt mixturesulphatesupercarbonatesalt chloridate. The trend of seed germination showed that the number of days in the initial seed germination was delayed and the number of germinated seeds in seed germination peak period was decreased with the increase of salt concentrations.
Study on the allelopathic effects of Flaveria bidentis on seed germination and seedling growth of two vegetables
2011, 5(2): 251-254.
[Abstract](1770) [PDF 483KB](777)
Abstract:
In order to reveal the allelopathy of Flaveria bidentis grown in Hengshui Lake on Brassica napus and Lactuca sativa, it was studied that allelopathic effects of aqueous extracts from root and stem+leaf crumbs of F. bidentis on the seed germination and seedling growth of B. napus and L. sativa. The study indicated that the aqueous extracts of F. bidentis had significantly depressed seed germination and germination speed index of L. sativa,but did not affect that of B. napus. The aqueous extracts of F. bidentis also siginificantly inhibited the length of root and seedling of B. napus and L. sativa. In general, synthetic inhibitory effect (SE) of F. bidentis on B. napus and L. sativa increased with the enhancing of extract concentration, and the allelopathic inhibition of F. bidentis root extracts was stronger than that of its stem+leaf. The allelopathic effect of F. bidentis on L. sativa was stronger than that on B. napus. The inhibited effect on root growth was greater than that of the seedling length. Allelopathic susceptibility was significant different between seedling stage and germination stage, and the former was more susceptible than the latter.
Study on the adaptability of Trifolium repens in the East of Sichuan
2011, 5(2): 255-259.
[Abstract](1506) [PDF 499KB](714)
Abstract:
The adaptability of two varieties, Ladinos and Huia, of Trifolium repens was studied in the Dazhou Fodder and Forage Grass Station of Sichuan Province from 2003 to 2008 by testing plant、root growth and development, the ratio of leaves to stem, grass and seed yields in the field, respectively. The results of this study indicated that both varieties adapted to the hot late summer weather in the Eastern Sichuan and were able to complete the reproductive cycle; there was no any obvious brown period during the growth period; the rate of oversummering was 100%; good diseaseresistant; and with higher and stable grass yield. The annual average of fresh grass yield of Ladinos was 87 784 kg/ha; that of Huia was 89 865 kg/ha. The annual average of dry grass yield of Ladinos was 12 483 kg/ha; that of Huia was 12 847 kg/ha. Two varieties can be used as main plants for artificial grassland construction at high temperature and drought region of the Eastern Sichuan Province, but not suitable for seed production.
Effect of fertilization on growth and yield of Lolium multiflorum
2011, 5(2): 260-265.
[Abstract](1514) [PDF 637KB](860)
Abstract:
Effect of fertilization on growth, content of chlorophyll and grass yield of Lolium multiflorum was studied through the field trail. The results of this study showed that the treatments of NPK combined fertilization and organic manure (OM) with same N content had significantly promoted growth and fresh grass yield of L. multiflorum. The plant tillers, height and the apparent leaf area of L. multiflorum under NPK treatment were significant higher than these under CK, PK and NK treatments, and the OM treatment was similar to NPK treatment. The NPK and OM treatments obviously increased the content of chlorophyll. The content of chlorophyll a of L. multiflorum under NPK treatment was 205.6%,189.5%, 29.9% and 3.1% higher than that under CK, PK, NK and NP treatments, respectively, and the content of chlorophyll b of L. multiflorum under NPK treatment was 292.3%, 218.8%, 50.0% and 2.0% higher than that under CK, PK, NK and NP treatments, respectively. The fresh yield of L. multiflorum treated with NPK combination fertilizer could rise by 255.0%, 329.1%, 37.5% and 9.0% compared with CK, PK, NK and NP treatments, respectively. The results of this study also indicated that the N fertilizer significantly promoted the L. multiflorum growth, and the impacts of P and K fertilizer were relatively lower. The effects of OM treatment were similar to NPK combined fertilization treatment.
Effect of root competition on growth of Vicia angustifolia:tragedy of the commons?
2011, 5(2): 266-272.
[Abstract](1383) [PDF 636KB](855)
Abstract:
A study was conducted with Vicia angustifolia, a common species in alpine meadow in Gannan, for comparision of the effects of different nutrients, pot partitions and activated carbon on root growth, proving whether the existence of tragedy of the commons, and understanding root identification mechanism. The treatments were included 3 factors which were nutrients, pot partitions or activated carbon under 2 levels of nutrient solutions (0.5 or 0.1 strength Hoaglands solution). Results from this study indicated that reproduction biomass had prominent response to the nutrient solution only; pot partition and activated carbon treatments affected the most of tested parameters significantly. Root biomass, aboveground biomass, total biomass, reproduction biomass, radio of reproduction biomass to total biomass, flower and pod numbers had increased significantly under non pot partition treaments compared to pot partitions. Allocation of biomass in V. angustifolia plants in response to root competition did not show the existence of tragedy of the commons and there was no balance bewteen root overproduction and reproduction allocation. However, the root identification mechanism of V. angustifolia is allelopathy.
The morphological diversity of endophytic fungus in Festuca sinensis in Gansu Province
2011, 5(2): 273-278.
[Abstract](1656) [PDF 567KB](986)
Abstract:
All of the Chinese fescue (Festuca sinensis) samples tested in the study were collected from Sangke and Ganjia grassland of Gansu Province.A total of 48 endophytic fungal strains were isolated and purified from Chinese fescue seeds and plants.Based on the observation and measurement of the morphological characteristics of the appearance of colony, conidia and conidiophores, all isolated examples were classified into 3 types. 13 of 48 strains were belonging to the ZHYMⅠ morphological group, 20 were ZHYMⅡ, 15 were ZHYMⅢ. A significant diversity was observed among the 48 strains in morphology.
A study on the epidemic pattern of rust disease and germplasm resistance evaluation in Zoysia japonica in Beijing
2011, 5(2): 279-285.
[Abstract](1498) [PDF 798KB](854)
Abstract:
From 2008 to 2009 the authors have investigated the pathogen, the epidemic pattern, and the resistance trait of rust disease in Beijing about 162 Zoysia japonica individual plants which collected from 6 different areas in China. The results of this study showed that: 1) All pathogens of rust disease found in this research were Puccinia zoysiae pathogens, no other species was founded. 2) In 2009, the rust disease occurrence index showed a single peak pattern. The disease started in the early June to the mid July,reached a peak at the mid September to the early October,and ceased at the end of November when frost came. 3) Among all tested individual plants, 3 groups (SD1, SD2, and SD3) were characterized by their rust resistance ability primarily,and 14 resistant plants and 29 susceptible plants were selected. The above results may provide a pathological basis and proper germplasms for further breeding program and genetic research on rust disease resistance in Z. japonica.
Research progress on effects of climate change on ecological environment in Northwest China
2011, 5(2): 286-295.
[Abstract](1929) [PDF 1236KB](1026)
Abstract:
Global change and terrestrial ecosystem are important content in recent global change researches. One of focuses on global change researches is the impact of climate change on terrestrial ecosystem. The impact of climate change on the ecological environment of Northwest China was reviewed generally. Through overall understanding and analyzing the impact of climate change on vegetation,biodiversity,wetland and water resources respectively, the paper also discussed response of the ecological environment of Northwest China with climate change and the existing problems, and proposed countermeasures against the impact of climate change on the ecological environment of Northwest China,based on recent research trends.
Research progress on ultradry seed storage
2011, 5(2): 296-303.
[Abstract](1415) [PDF 886KB](847)
Abstract:
Ultradry seed storage is a method in which low moisture seeds are storied in a closed container at room temperature and aim to replace partly or entirely the low temperature seed storage bank. Ultradry seed storage could improve the storage stability of seeds, but not the seed moisture content the lower the better. Protein, inoxidizable system, sugar and membrane system all affected desiccation tolerance of seeds. Ultradry seed storage not only improves seed viability but also keep seed genetic stability.
Evaluation of the efficacy of 8 types of biocide for controlling grasshoppers in field
2011, 5(2): 304-307.
[Abstract](1821) [PDF 489KB](789)
Abstract:
Experiments on the efficacy of 8 biocides for controlling grasshoppers were carried on in field, which included 4 types of Metarhisiums,Beauveria,0.3% Azadirachtin,1% Matrine and Sendebao, for screening out several good biocides to popularize in a large scale. The results of this study showed that the effect of 0.3% Azadirachtin,1% Matrine and Sendebao were better than that of other 5 biocides on controlling grasshoppers and their efficiency reached 90% on the 11th day after spraying in field. The effect of 4 types of Metarhisiums reached 65% on the 11th day after spraying and Beauveria was poorer. Metarhisium,Azadirachtin,Matrine and Sendebao can be used as substitutes for organic phosphorus and cycloprothrin pesticide in field due to their goodeffect, lowpoison and stemming from vegetation.
Research progress on economic and ecological threshold of grassland locust control
2011, 5(2): 308-312.
[Abstract](1417) [PDF 698KB](770)
Abstract:
Since the 21st century, grassland locust plague has occurred successive years in China, which has threatened animal husbandry development and north ecological security seriously. The study on the economic and the ecological threshold which offers the decision basis for locust control is one of the important research subjects in grassland plant protection field. The concept and theory of economic and ecological threshold for pest control were reviewed and discussed. The research progress on economic and ecological threshold of locust control and the relation of two thresholds in practical application in China was summarized and analyzed. At present, lacks of the systematic and sustained research in this area lead to ineffective direction about the complex situation of locust plague in China. Therefore, some suggestions were put forward for the future research.
Approaching the jointstocksystem cooperation operation pattern for grasslandtakingA case study in Maqu County
Chun-Lei YANG
2011, 5(2): 313-318.
[Abstract](1891) [PDF 915KB](843)
Abstract:
Household responsibility system for grassland carried out in the Maqu County of east part of QinghaiTibet Plateau provides a basic for economic development in this pastoral region, consequently, resulting in some problems in the grassland ecology and in the living and production conditions of herdsmen, therefore, reforming the household responsibility system for grassland is necessary to improve the grassland management pattern. Based on successful jointstocksystem management pattern for grassland appeared in the some village of Maqu County, this study proposed that the jointstocksystem cooperation operation pattern was a optimal pattern to grassland management by optimizing the resources allocation and introducing the mechanism of jointstocksystem, and this pattern consisted of partnerships cooperative management in the winter and spring and village cooperative management in the summer and autumn, and would balance the relationship between grassland conservation and living and production conditions of herdsmen. This study suggested that the jointstocksystem cooperation operation pattern for grassland would benefit the sustainable development of animal husbandry production by improving the household responsibility system for grassland.
Design of the solar drying greenhouse and drying equipment for the QinghaiTibet Plateau
2011, 5(2): 319-322.
[Abstract](1373) [PDF 509KB](759)
Abstract:
In order to dry fresh forage with low cost in QinghaiTibet Plateau, a scheme is presented which utilizes solar energy to work in this study. In the scheme, air is firstly heated by a solar collector, and then the hot air enters a hot greenhouse to dry the forage. The forage can be further dried by a rotary dryer. The cost of the scheme for drying is expected to be reduced remarkably since a little of regular energy is needed, so it is suitable for drying forage in QinghaiTibet Plateau.
The effect of different additives on Caragana korshinskii silage
2011, 5(2): 323-326.
[Abstract](1673) [PDF 462KB](787)
Abstract:
The effects of additives on Caragana korshinskii silage were studied. The plants of C. korshinskii during flowering stage were harvested and ensilaged with 3 treatments: 1) CK, 2) adding formic acid (6 mL/kg) and 3) sucrose (2%), then bagged in seal bags for 360 d. The results of this study showed that the silage fermentation quality was improved with the additives of formic acid and sucrose respectively. The pH of C. korshinskii silage were decreased significantly with adding sucrose (P0.05), lactic acid content increased significantly (P0.01) and ammonia nitrogen content decreased significantly (P0.01). The lactic acid content increased significantly (P0.01) and ammonia nitrogen content decreased significantly (P0.01) with adding formic acid. The dry matter recovery of the silage increased with addition of formic acid and sucrose (P0.05) respectively. The nitrate content reduced after ensilaged.
The current situation and development trend of Medicago spp. grass industry in Gansu Province
2011, 5(2): 327-330.
[Abstract](1444) [PDF 634KB](797)
Abstract:
Gansu is one of the biggest provinces in artificial grassland construction in China, the area of the artificial grasslands is in the second position and the area of alfalfa is in the first position, the grass industry science and technology holds the important position as well. But the grass industry in Gansu has still faced several problems, for examples, the contradiction between the huge investment demand and the actual investment serious insufficient; between market demand and the quantity or quality of products; between the enhancement of profession overall benefit and the market, the natural condition dual risks; and between product structure optimization promotion demand and scientific research investment management lag. This study indicated that the current artificial pasture construction still showed reducing tendency; but the grass industry market was still active; the marketing price was rising steadily, and the artificial pasture construction and livestock production maintained the positive development tendency continually.
Analysis of the current utilization of grassland agriculture resource in the Longdong Loess Plateau A case study at Huan County, Gansu
2011, 5(2): 331-333.
[Abstract](1636) [PDF 486KB](775)
Abstract:
Huan County is located in the typical agropastoral area of the Longdong Loess Plateau. Due to improper use of agricultural structure and resources, the agricultural system development was fettered. This study was conducted to understand and analyze the current situation and advantages of local natural resources and agricultural structure, and also suggested that it would be very important to utilize and protect natural grassland rationally, increase artificial grassland construction, and pay an attention to the utilization of crop straw for promoting the sustainable development of animal husbandry and maintaining natural ecosystems.