氮肥用量对甘薯干物质积累和氮磷钾吸收的影响  

Nitrogen Applying on Dry Matter Accumulation and N, P and K Absorption Efficiencies of Sweet Potato

作　　者：陈娟[1] 曲明山[1] 郭宁[1] 陈保华[1] 张静 张怀文 廖洪[1] 

机构地区：[1]北京市土肥工作站,北京100029 [2]北京市顺义区农业科学研究所,北京101300

出　　处：《农学学报》2014年第3期35-38,共4页Journal of Agriculture

基　　金：北京市财政项目"2010年测土配方施肥项目"(pxm2010-036205-094901)

摘　　要：在北京顺义区农科所基地开展田间试验,设置5个氮水平处理,研究不同氮肥用量对甘薯干物质积累及氮磷钾吸收效率的影响。结果表明:施氮量为210 kg/hm2时,甘薯的鲜薯产量达到最大值30.4 t/hm2;甘薯干物质积累量为21423 kg/hm2,氮磷钾累积值也达到最大;当施氮量超过210 kg/hm2时,干物质积累量随着施氮量的增加而不再增加,而呈平台反应;施氮量为210 kg/hm2时,甘薯磷、钾累积值也最大,分别是145.7 kg/hm2和247.4 kg/hm2。因此,本试验条件下甘薯的最佳氮肥用量为210 kg/hm2。Field experiments were conducted at the station of Shunyi Agriculture Sciences Institute in Beijing.This study is about the effects of 5 levels of nitrogen applying on dry matter accumulation and N, P and Kabsorption efficiencies of sweet potato. It indicated that yield reached the highest value of 30.4 t/hm2 at N levelof 210 kg/hm2, and the ~＇orresponding dry matter reached 21423 kg/hm/ and the P and K accumulationsreached the highest values of 145.7 kg/hmz and 247.4 kg/hm1. When the N level exceeded 210 kg/hm2, drymatter did not increase with the increase of N applying which showed a platform relationship. We can concludethat 210 kg/hm2 N was the optimum N level for sweet potato.

关 键 词：甘薯 干物质积累 氮磷钾吸收效率 

分 类 号：S531[农业科学—作物学]