设施和露地白菜生产中肥料的偏生产力分析

在对云南省滇中地区3个州(市)4个县(市)共41个白菜种植农户进行的田间实地访问和问卷调查基础上,探讨了设施和露地白菜生产中肥料施用量与肥料偏生产力的关系,并对农户施肥合理性进行了评价。结果表明,云南省露地白菜的肥料偏生产力为67.3kg/kg,其中氮(N)、磷(P2O5)、钾(K2O)肥的肥料偏生产力分别为123.0、425.5、228.5kg/kg。设施白菜化肥的肥料偏生产力为84.7kg/kg,其中氮(N)、磷(P2O5)、钾(K2O)肥的肥料偏生产力分别为190.3、362.1、263.5kg/kg。露地与设施白菜化肥的肥料偏生产力均随着施肥量增加而下降,但不是简单的直线下降,而是随着施肥量的增加呈负指数幂的趋势降低,这也说明施肥量是影响肥料偏生产力的因素之一,但不是唯一的因素,其还与作物产量以及影响作物产量的因素有关。对于肥料偏生产力来说,氮、磷、钾肥都表现出同一规律,即与较高施肥阶段的肥料偏生产力相比,较低施肥阶段的肥料偏生产力提高至少1倍。

Studies on Partial Factor Productivity(PFP) of Chinese Cabbage Fertilization in Protected and Open Land

Partial factor productivity(PFP) reflects the overall status of soil fertility andfertilizer use.Fertilizer amount application can affect the fertilizer PFP.In this study,41 Chinese cabbage cultivating farmers distributed in 4 counties,3 prefectures in central district of Yunnan province were visited through questionnaire,and the relationship between fertilization rates and fertilizer PFP was discussed,and the reasonable fertilizer was evaluated.Results indicated that the total fertilizer PFP in Chinese cabbage of open land was 67.3 kg/kg,and PFP for N,P and K fertilizers were 123.0 kg/kg,425.5 kg/kg and 228.5 kg/kg respectively.Results indicated that the total fertilizer PFP in Chinese cabbage of protected land was 84.7 kg/kg,and PFP for N,P and K fertilizers were 190.3 kg/kg,362.1 kg/kg and 263.5 kg/kg respectively.Nitrogen application and nitrogenous fertilizer PFP,Phosphorus application and Phosphate fertilizer PFP,Potassium application and Potash fertilizer PFP,total Nutrient rate and total fertilizer PFP were all of negative exponential power relationship.