摘要
采用田间小区试验研究了莲藕氮肥合理用量与运筹方式,结果表明:在理论产量处于29 000～32 000 kg/hm2范围且基本相等的条件下,采用线性+平台模型得到的莲藕临界施氮量(350～417 kg/hm2),低于用二次型模型得到的莲藕最佳经济施氮量(469～604 kg/hm2),根据湖北莲藕生产和施肥现状,以及藕田土壤氮素肥力水平,提出湖北莲藕氮肥(N)合理用量为300～375 kg/hm2。氮肥运筹可采用"40%基肥+20%立叶肥+40%坐藕肥"和"60%出叶肥+20%立叶肥+20%坐藕肥"2种分配方式,前者适用于在4月上、中旬莲藕移栽之前施基肥的藕田,后者适用于在莲藕抽出2～3片立叶后才施第一次肥的藕田。
Rational nitrogen （N） fertilizer application rate and assignment on rhizome lotus were studied by field experi- ments. Results showed that under an almost equal theoretical rhizome lotus yield of 29 000 - 32 000 kg/hm2, the critical value of N application rate that determined by linear ＋ plateau model （350 -417 kg/hm2） was greatly lower than the opti- mum economic N application rate that determined by quadratic model （469 -604 kg/hm2）. Taken the present status of rhi- zome lotus production, fertilization of farmer practice and lotus field soil N fertility into consideration, rational N application rates on rhizome lotus in Hubei province were suggested to be 300 ~ 375 kg/hm2. Two rational N fertilizer assignment styles were proposed, one was ＂40% basal fertilizer ＋ 20% top-dressing in early June ＋ 40% top-dressing in late June or early Ju- ly＂, the other was ＂60% top-dressing in early or middle May ＋ 20% top-dressing in early June ＋ 20% top-dressing in late June or early July＂. The former was suitable for lotus field where the basal fertilizers were applied just before rhizome lotus transplanting in early or middle April, and the latter was suitable for lotus field where the first fertilizers application was con- ducted after 2 - 3 standing leaves developed.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2013年第2期66-71,共6页
Soil and Fertilizer Sciences in China
基金
国家科技支撑计划课题(2012BAD27B02)
湖北省农业科技创新项目(2011-620-003-03-05)
国际植物营养研究所(IPNI-HB-24)项目
关键词
莲藕
氮肥
合理用量
合理运筹方式
rhizome lotus
nitrogen fertilizer
rational application rate
rational assignment
作者简介
刘冬碧（1971-），女，湖北恩施人，副研究员，主要从事作物营养与优化施肥技术研究。
通讯作者为熊桂云。
