摘要
经回归统计分析,张掖市加工型马铃薯N素经济效益最佳施用量为0.100 t/hm2,N素最佳施用量时的理论产量为42.89 t/hm2。P素经济效益最佳施用量为0.076 t/hm2,P素最佳施用量时的理论产量为40.98 t/hm2。K素经济效益最佳施用量为0.198 t/hm2,K素最佳施用量时的理论产量为43.58 t/hm2。经增产效应和经济效益分析,加工型马铃薯产量随N、P、K素用量增加而增加,但边际产量、边际产值、边际利润、肥料贡献率则随N、P、K用量增加而递减,此趋势符合报酬递减律。
The regression analysis showed that the optimal economic benefits of the processed-potato in Zhangye city could be obtained under the uses of 0.100 t/hm2 of nitrogen, 0.076 t/hm2 of phosphorus and 0.198 Vhm2 of potassium, respectively, with the corresponsive theoretic yields of 42.89 Vhm2, 40.98 Vhm2 and 43.58 t/hm2, respectively. With the increase of nitrogen, phosphorus and potassium fertilizers, the yield of processed-potato increased but the marginal yield, product value and profit, fertilizer contribution rate decreased, which were accord with the law of diminishing returns.
出处
《土壤》
CAS
CSCD
北大核心
2011年第4期570-575,共6页
Soils
基金
国家科技支撑计划基金项目(2007BAD89B17)
甘肃省科技计划项目(1006NCXG012)资助
关键词
加工型马铃薯
氮磷钾
经济效益
最佳施用量
Processcd-potatocs, Nitrogen-phosphorus-potassium, Economic benefits, Optimal fertilizer use
作者简介
秦嘉海（1954-），男，甘肃张掖人，教授，主要从事植物营养与施肥方砥研究。E-mail：qinjiahai123@163．com
