毛竹纸浆竹林施用氮磷钾肥料效应的研究

THE EFFECTS OF N, P AND K FERTILIZER APPLIEDIN PULP BAMBOO STAND

采用三因素二次通用旋转组合设计方法，建立了氮、磷、钾施肥与毛竹纸浆林新竹产量相对生长率之间的效应模型，经检验二次回归模型拟合较好。通过对肥料主效应的分析，明确了本次试验氮、磷、钾三因素对毛竹新竹产量的增产作用依次为氮肥＞钾肥＞磷肥；对两因素交互效应的分析得出：氮、钾之间存在一定程度的正交互效应，而氮磷、磷钾间的交互效应不明显。模型经微机模拟寻优，氮、磷、钾因素取９５％置信域的高产施肥组合方案为：尿素３２５５～４１３５ｋｇ／ｈｍ２，过磷酸钙２０８５～２９５５ｋｇ／ｈｍ２，氯化钾１９８～２６７ｋｇ／ｈｍ２。并对其相应的经济效益作了分析。

お? With three elements design of universal quadratic rotation combination, the models are established about the effects of N, P and K fertilizer on the relative growth rate of culm output of Phyllostachys pubescens stand. By testing, the quadratic regression medel has better simulation effect than others. The analysis of the principal effect of fertilizer shows that N, P and K have different effects on the increase of the output of P.pubescens stand, and the action order is: N>K>P in this test. 2factor interaction analysis shows that there is a positive interaction between N and K to certain extent, but there is no significant interaction between N and P, as well P and K. By computersimulating, the optimum fertilization combination is designed (within the confidence limits of 95%), i.e.urea 3255～4135kg/hm2, superphosphate 2085～2955kg/hm2 and potassium chloride 198～267kg/hm2. Finally, the consequent economic benefit is analyzed.