柳杉苗木综合营养诊断I.田间DRIS图解法

Diagnosis and recommendation integrated system of Cryptomeria fortunei seedlings I.Diagrammatizing method of DRIS in field

应用N、P、K三元二次旋转回归法,根据1年生柳杉苗木现实生物量的差异,划分2种不同的产量类型,以高产量类型作为最适值,结合DR IS诊断图的绘制和应用,研究氮、磷、钾肥不同施肥配比条件下苗木体内氮、磷、钾的养分含量及其需求程度,对柳杉苗期进行营养诊断分析.结果表明:柳杉苗期叶片3元素浓度最佳比值范围为:N/P=9.439 8±1.345 7,N/K=3.263 9±0.178 7,P/K=0.359 2±0.045 6.以三元二次旋转回归法设计的各处理苗木为例,列出各元素的DR IS诊断相对需肥次序,证实了营养诊断的准确性.

Two different types of outputs were divided by the real biomass of one-aged Cryptomeriafortunei seedlings, and application of the ternary quadratic rotary recursive fertilizer design of N, P and K. Moreover, DRIS diagnosising diagram was drawn by optimal values deduced from the N, P and K nutrient elements contents of high-yielded type and applied to determine the demand of seedling. The nutrition diagnosis was analyzed on the C. fortunei seedlings. The results showed that the rational scales of ratioes among the nutrient elements were as following, N/P = 9. 439 8 ± 1. 345 7, N/K = 3. 263 9 ± 0. 178 7, and P/K = 0. 359 2 ± 0. 045 6. The application of examples treated by ternary quadratic rotary recursive fertilizer design confirm the diagnosing accuracy, and list sequence of nutrients demanding through DRIS.