作物学报2016，Vol.42Issue(8)：1176-1187,12.DOI:10.3724/SP.J.1006.2016.01176
机插条件下低氮密植栽培对“早晚兼用”双季稻产量和氮素吸收利用的影响
Effect of Low Nitrogen Rate Combined with High Plant Density on Yield and Nitrogen Use Efficiency of Machine-transplanted Early-late Season Double Cropping Rice
摘要
Abstract
In order to alleviate the contradictions of growth period mating problem of machine-transplanted double cropping rice in Changjiang Rive regions, a field experiment with three nitrogen rates (0, 110–140, and 176–189 kg N ha–1) and three plant den-sities (36.4, 28.6, and 19.0 hill m–2) was conducted using conventional early variety “Zhongjiazao 17” in both early and late sea-sons to explore the effects of machine transplanting densities and N application on yield and N recovery efficiency (REN) in 2014–2015. Adopting the same conventional early variety was able to reach the high yield in machine-transplanted early-late sea-son double cropping rice. The treatment of high density (36.4 hills m–2) with high nitrogen rate (176 kg ha–1 in early season, 189 kg ha–1 in late season) had the highest yield of 16.94 t ha–1 in 2014 and 16.99 t ha–1 in 2015, but not significantly higher than the treatment of high density with low nitrogen rate (110 kg ha–1 in early season, 140 kg ha–1 in late season). REN declined with in-creasing N application and improved with increasing density. The treatment of high density with low nitrogen rate showed the highest REN of 62.77%, 55.75%, 65.82%, 64.37% in early and later season 2014 and 2015, which are 12.11%, 9.01%, 8.49%, and 2.14% higher than the treatment of high density with high nitrogen rate, respectively. The treatment of high density with low ni-trogen rate displayed certain advantages of dry matter accumulation and radiation use efficiency compared with the treatment of low density (19.0 hills m–2) with high nitrogen rate. As a result, adopting high planting density and low nitrogen fertilizer could not only achieve high yield, but also significantly improve REN in early-late season double cropping rice. The key technology provided in the study would be available for machine-transplanted double cropping rice cultivation in the Yangtze River regions.关键词
双季稻/机插密度/施氮量/产量/氮素利用率Key words
Double cropping rice/Machine-transplanting density/N application/Grain yield/Nitrogen use efficiency引用本文复制引用
陈佳娜,曹放波,谢小兵,单双吕,高伟,李志斌,黄敏,邹应斌..机插条件下低氮密植栽培对“早晚兼用”双季稻产量和氮素吸收利用的影响[J].作物学报,2016,42(8):1176-1187,12.基金项目
本研究由国家现代农业产业技术体系建设专项子课题水稻栽培与土壤岗位科学家项目(2011-2015)(CARR-01)资助。 This study was supported by the China Agriculture Research System (CARR-01) （2011-2015）
