不同母质类型水稻土上莲藕施肥效应研究

目的]为莲藕科学施肥技术提供依据。方法]采用微区试验研究了施用氮磷钾配比肥料及有机肥对潮土性水稻土和黄棕壤性水稻土上莲藕生长和产量的影响。结果]不同母质类型的水稻土上,莲藕的长势长相和总产量相差不大,但潮土性水稻土上莲藕施K肥产量效果优于黄棕壤性水稻土,施P肥产量效果明显差于黄棕壤性水稻土,施有机肥和N肥的产量效果基本一致。2种类型水稻土上莲藕产量与不同阶段立叶总面积均呈显著正相关。潮土性水稻土上莲藕N、P和K的净吸收量之比平均为1∶0.25∶2.71,黄棕壤性水稻土上平均为1∶0.36∶5.43,说明莲藕对K素的需求明显高于N素。结论]2种土壤比较而言,潮土性水稻土上莲藕的N素利用率较高,K素利用率较低,P素利用率相差不大。

Effect of Fertilization on Root Lotus in Paddy Soils Derived from Different Parent Materials

Objective] The aim of the research was to provide base for scientific fertilization technique of root lotus.Method] In micro-plot experiment the effect of applying N,P,K matching fertilizer and organic fertilizer on the growth and yield of root lotus(Nelumbo nucifera)in fluvo aquic paddy soil and yellow brown paddy soil was studied.Result] In paddy soils derived from different parent materials the growth vigor and total yield of root lotus had little difference,but the effects of K and P fertilization on the yield of root lotus in fluvo aquic paddy soil were higher and lower than that in yellow brown paddy soil resp.and the effect of organic fertilizer on yield was basically consistent with that of N fertilizer.The yield of root lotus in two types of paddy soils showed a significantly positive correlation with total area of erect leaves in different growth stages.The ratios of N,P and K uptake of root lotus in fluvo aquic paddy soil and in yellow brown paddy soil were 1∶ 0.25∶ 2.71 and 1∶ 0.36∶5.43 resp.,which indicated that lotus root had a much larger demand of K than of N.Conclusion] Comparison on two types of paddy soils showed that the use efficiency of N was higher and that of P was lower in fluvo aquic paddy soil,and there was not much difference on P use efficiency between the two types of paddy soils