玉米马铃薯间作施肥的偏生产力分析

Analysis on the Partial Factor Productivity(PFP) in Maize and Potato Intercropping

肥料偏生产力(PFP)是反映土壤基础养分水平和化肥施用量综合效应的重要指标。通过对云南省玉米马铃薯间作主要种植区4个县(市)8个乡16个村共120个农户的田间访问和随机问卷调查,获得了云南省玉米马铃薯间作施肥的第一手资料,并从肥料偏生产力(PFP)角度进行了分析研究。结果表明,云南省玉米马铃薯间作主要种植区总养分投入量为838.96 kg/hm2,其中化学养分总投入量为564.91kg/hm2,化肥施用的偏生产力为20.01 kg/kg,按氮(N)、磷(P2O5)和钾(K2O)计算则肥料偏生产力分别为27.41、137.17和164.39 kg/kg。与单作玉米相比,氮(N)、磷(P2O5)和钾(K2O)的肥料偏生产力分别增加7.34、47.61、47.93 kg/kg;与单作马铃薯相比,氮(N)、磷(P2O5)和钾(K2O)的肥料偏生产力分别增加9.1、103.29、124.9 kg/kg。玉米马铃薯间作在提高肥料利用效率上与单作相比具有明显优势。

Partial factor productivity(PFP) is an important index reflecting the status of soil basic fertility and the effect of chemical fertilizers application.120 typical farmers conducting maize and potato intercropping practice distributed in 8 villages,4 prefectures in Yunnan province were selected to investigate the status of fertilizer application,then the partial factor productivity(PFP) of chemical fertilizers in maize and potato intercropping in Yunnan province was analyzed.The results indicated that the total nutrients input in maize and potato intercropping system was 838.96 kg/hm2 averagely and the chemical nutrients input was 564.91 kg/hm2.The total fertilizer PFP in maize and potato intercropping was 20.01 kg/kg,the PFP of N,P2O5 and K2O fertilizers were 27.41,137.17 and 164.39 kg/kg respectively.Compared with that in monocropping,the PFP of N,P and K2O of maize increased by 7.34,47.61 and 47.93 kg/kg respectively,the PFP of N,P2O5 and K2O of potato increased by 9.1,103.29 and 124.9 kg/kg.Maize and potato intercropping were better than monocropping in increasing fertilizer use efficiency.