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以紫花苜蓿为试材,采用‘3414’部分实施方案,研究氮磷钾不同配比施肥对旱地紫花苜蓿性状及产量的影响。结果表明:不同氮磷钾配比施肥下,各茬次紫花苜蓿在整个生长过程中呈‘S’型生长曲线,符合限制密度下的种群Logistic增长模型;5年生旱地紫花苜蓿获得最佳产量栽培的氮磷钾施肥量方案为N2P4K3,即纯N为54kg·hm~(-2),P_2O_5为135kg·hm~(-2),K_2O为15kg·hm~(-2),产量为466.2t·hm~(-2)。
With alfalfa as test material, using ’3414’ part of the implementation of the program to study the different proportion of nitrogen, phosphorus and potassium fertilizers on dry land characteristics and yield of alfalfa. The results showed that under different N, P and K fertilization rates, the growth curves of ’S’ showed the ’S’ growth curve in different growth stages, which accorded with the logistic growth model of population density under limited density. The optimal yield of five-year-old alfalfa The nitrogen, phosphorus and potassium fertilization program is N2P4K3, that is, the pure N is 54kg · hm -2, the P 2 O 5 is 135kg · hm -2, the K 2 O is 15kg · hm -2 and the yield is 466.2t · hm ~ (-2).