Effects of nitrogen application rate and density on the stoichiometric characteristics of C, N, and P in oat leaves

By measuring the contents of C, N, and P in oat leaves under different densities and nitrogen applications, and calculating the ratios of C/N, C/P, and N/P, the effects of density and nitrogen application on the stoichiometric characteristics of C, N, and P in oat leaves were discussed. This study aimed to provide a reference for exploring the nutrient limitations of oat leaves in the Horqin Sandy Land. The results showed that the C, N, and P contents in the leaves varied with the increasing nitrogen application, in which the N contents first decreased and then increased. With the increasing density, the contents of C, N, and P showed a gradually decreasing trend. Under different nitrogen application rates, the ranges of leaf C/P, C/N, and N/P were 7.11～19.80, 1.95～4.13, and 4.94～12.13, respectively. At different planting densities, the ranges of leaf C/P, C/N, and N/P were 7.11～17.66, 1.64～2.80, and 2.56～12.18, respectively. When the amount of applied nitrogen and density interact, the N/P ratio was between 2.56 and 14.18, and the growth of the oats was restricted by N.