中国生态农业学报2011，Vol.19Issue(2)：265-270,6.DOI:10.3724/SP.J.1011.2011.00265
太湖地区稻麦轮作体系下秸秆还田配施氮肥对水稻产量及经济效益的影响
Effects of different N-fertilizer rates with straw incorporation on rice yield and economic benefit of rice-wheat rotation system in Taihu Lake region
摘要
Abstract
The application of fertilizers along with straw incorporation was a common practice in sustainable crop production. A field experiment under different N-fertilizer application rates with full straw incorporation was conducted to explore N application rate for optimal crop yield and economic benefit in Taihu Lake region. Five treatments were designed with 0 (N0), 120 kg(N) · hm-2 (N1), 180 kg(N) · hm-2 (N2), 240 kg(N) · hm-2 (N3) and 300 kg(N) · hm-2 (N4) N-fertilizer application rates each with 6 t · hm-2 incorporated straw. Results showed that rice yield initially increased with increasing N-fertilizer rates and then decreased. The maximum rice yield in 2007 and 2008 was 8 543 kg · hm-2 and 7 772 kg · hm-2, respectively. Compared with N0 treatment, rice yield for the two years of N-fertilizer application (treatment N1～N4) increased by 9.6％～19.4％ and 13.0％～17.8％, respectively. Compared with N0～N3 treatments in 2008, N4 treatment presented obviously lower marginal yield (4.5 kg · kg-1), agronomic use efficiency of N-fertilizer [3.0 kg · kg-1(N)], seed setting rate (69.9％), 1000-grain weight (25.1 g), additional net-income rate (0.91％), and marginal cost return rate (1.03 Yuan · Yuan-1). A fitted rice yield, economic benefit and N-fertilizer application rate equation showed an optimal N-fertilizer rate of 218～223 kg · hm-2, under which the optimum rice yield and maximum economic benefits were 7 686～8 295 kg · hm-2 and 7 413～8 607 Yuan · hm-2, respectively. Optimum N-fertilizer application with full straw incorporation not only achieved the best economic benefits, but also the highest rice yield and nitrogen utilization efficiency.关键词
秸秆还田/氮肥用量/水稻产量/氮肥利用率/经济效益/太湖地区Key words
Straw incorporation/ N-fertilizer application rate/ Rice yield/ Nitrogen utilization efficiency/ Economic benefit/Taihu Lake region分类
农业科技引用本文复制引用
汪军,王德建,张刚..太湖地区稻麦轮作体系下秸秆还田配施氮肥对水稻产量及经济效益的影响[J].中国生态农业学报,2011,19(2):265-270,6.基金项目
中国科学院知识创新工程项目(KZCX2-YW-440)和家自然科学基金项目(40871145)资助 （KZCX2-YW-440）
