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作 者 ：易琼 赵士诚 张秀芝 杨利 熊桂云 何萍

期 刊 ：植物营养与肥料学报 2012年 18卷 4期 页码：777-785

关键词：水稻品种；实时实地氮素管理；SPAD阈值；氮素利用率；

Keywords:rice cultivars, real time and site specific N management, SPAD threshold value, N use efficiency,

摘 要 ：以扬两优6号和培两优3076水稻为材料，通过田间试验比较研究了基于SPAD值的氮素管理对水稻氮素吸收、产量和氮肥利用率的影响。结果表明，随着SPAD预设阈值的增加，氮肥用量增加，籽粒产量和氮素吸收也随之增加。实时氮素管理条件下，水稻扬两优6号和培两优3076均以SPAD值为41处理获得较高的籽粒产量和氮素利用率，该处理在籽粒产量不降低的同时节约了氮肥用量12. 8% ～33.3%；而实地氮素管理条件下，水稻扬两优6号和培两优3076均以SPAD值为39～41处理获得较高的籽粒产量和氮素利用率，该处理在籽粒产量不降低的同时节约了23.1%的氮肥用量。鉴于实地氮素管理在田间易于操作，因此建议采用39～41作为水稻关键生育期指导氮肥施用的SPAD阈值。

Abstract:Two rice cultivars of Yang liang you 6 (YLY6) and Pei liang you 3076 (PLY3076) were used in the field experiments to study the effects of SPAD values guided fertilization on nitrogen (N) uptake, yield and N use efficiency in two rice cultivars. The results showed that the N application rate, grain yield and N uptake increased with increment of preset SPAD values. Under real time N management practice (RTNM), the treatment of SPAD value for 41 obtained higher grain yield and N use efficiency for both YLY6 and PLY3076, besides, it could save N fertilizer by 12.8%–33.3% while maintaining almost the same yield level as compared with farmer’s practice (FP). Under site specific N management practice (SSNM), the treatment of SPAD value for 39–41 achieved higher grain yield and N use efficiency, and saved N fertilizer by 23% compared to FP. Taking the convenient management into consideration, it was suggested that the SPAD value of 39–41 would be adopted as the threshold value under the site specific N management practice.

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