亚高山草甸土青稞肥料效应与优化施肥研究

 采用三因素五水平二次正交回归设计和田间小区试验,研究亚高山草甸土青稞的肥料效应,并建立肥料效应数学模型。结果表明：在该试验条件下,氮、磷、钾肥施用对青稞产量都有明显的增产作用,其肥料效应顺序为钾肥>磷肥>氮肥。利用计算机对数学模型直接摸拟法寻优,青稞最高产量3909kg/hm ²,施肥量分别是氮（N）：120kg/hm ²、磷(P₂O ₅)120kg/hm ²、钾(K ₂ O)99kg/hm ²。最佳利润施肥量分别是氮（N）：30kg/hm ²;磷(P₂O ₅) 30kg/hm ²;钾(K ₂O)30kg/hm ²。

Optimal NPK Fertilization and Its Effect on Naked Barley Yield in Sub-highland Region

Optimal fertilization is imperative in increasing both naked barley (Hordeum vulgare var．nudum hook.f.) yield and fertilizer efficiency in highland region. Field trials were conducted in a highland meadow soil at Zhongdian County, Yunnan province to study the optimal fertilizer rates of nitrogen (N), phosphate (P) and potassium (K) and their effect on highland barley (H. vulgare). The experimental design was an orthogonal rotational combination of 3 factors (N, P and K) and 5 levels. The regression equations were developed to determine the relationship between N, P, K rates and barley yield; and the relationships of N, P and K rates with their effects on the yield. The results showed that, N, P and K fertilization increased barley yields significantly. The fertilizer response order was K >P > N. Based on the mathematical model calculation and regression analyses,the highest yield of 3909kg/hm ² was obtained when fertilizer rates were N 120kg/hm ², P₂O ₅120kg/ hm ² and K ₂O 99kg/hm ², respectively．The fertilizer rates for maximum profit were N 30kg/hm ²、 P₂O ₅30kg/hm ² and K ₂O 30kg/hm ² , respectively．