采用三因素二次回归正交旋转组合设计,建立撑绿竹纸浆林新竹产量与氮磷钾肥施用量的回归模型.通过对肥料主效应的分析得出,氮磷钾肥对产量的影响程度依次是:磷(x2)＞钾(x3)＞氮(x1),对两因素交互效应的分析得出:磷、钾之间存在一定程度的正交互效应.通过对回归方程进行模拟寻优,得到本试验条件下,撑绿竹最高产量(7 881.47 kg,/hm2)和最佳经济效益(2 963.19元/hm2)的氮磷钾编码值分别为0.37、1.68、1.68和0.05、1.12、1.03.最高产量时尿素、过磷酸钙和氯化钾的施用量分别为601.32、978.46、549.77 kg/hm2;获得最佳经济效益时,氮磷钾肥施用量分别降低了79.12、162.69、106.42 kg/hm2,产量降低了5.82％,但经济效益却增加了7.29％.说明扩大撑绿竹林面积比单纯增加施肥量可获得更多的产量和效益.%A model of application effect of IS , P and K fertilizer on yield of Bambusa pervariabilis x Dendrocalamopsis daii was established by quadratic regression orthogonal rotational design of three factors in the current work. The analysis of the principal effect of fertilizer showed that N, P and K had different effects on the increase of the bamboo output, and the function order was: P(χ2) ＞ K (χ3)＞ N(χ1) . Two-factor interaction analysis showed that there somewhat existed a positive interaction between P and K. By computer simulation, the optimum fertilization combinations, N0.37P1.68K1.68 for maximum yield (7 881.47 kg/hm2 )and N0.05 P1.12K1.03 for the best economic income (2 963.19 yuan/hm2) were obtained. Under this experimental condition, the best fertilization program for the maximum yield was combination application of 601.32 kg/hm ure-a, 978.46 kg/hm2 superphosphate, and 549.77 kg/hm2 potassium chloride. Compared with the maximum yield fertilizer program, the fertilizer amounts of urea, superphosphate and potassium chloride for the best e-conomic income decreased by 79. 12 kg/hm2, 162. 69 kg/hm2 and 106.42 kg/hm2, respectively, by which the bamboo yield reduced 5. 82% and economic benefits increased 7. 29% . Therefore, the enlargement of plantation area is more effective in comparison with increase of fertilizer application.
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