Optimum conditions of cultivation for seed production of Phalaris tuberosa cv. Weining

A method of quadratic regression orthogonal rotation design was used to establish mathematical models for studying the relationships between seed yield of Phalaris tuberosa cv. Weining and five main cultivation factors (sowing rate, organic, nitrogen, phosphate and potash fertilizer) in 2008-2010. The results indicated that the order of the impact of various factors to the seed yield was the sowing ratenitrogen fertilizerorganic fertilizerphosphate fertilizerpotassium fertilizer. The analysis of twofactor interaction effects showed that the interaction effects between the seeding rate and nitrogen fertilizer; the seeding rate and the phosphorus fertilizer; or the nitrogen and the potassium fertilizer were more significant ot the seed yield. The optimum cultivation conditions for seed production of P. tuberosa cv. Weining were: sowing rate 3.75 kghm-2, organic fertilizer 7 500 kghm-2, nitrogenous fertilizer 450 kghm-2, phosphate fertilizer 750 kghm-2 and potash fertilizer 450 kghm-2. The highest seed yield was obtained at 449.50 kghm-2.