摘要
应用反射仪测定棉株叶组织硝态氮含量 ,研究了硝态氮作为棉花氮营养诊断和追肥推荐指标的可行性。结果表明 ,棉花不同部位硝酸盐含量依次为叶柄 >主茎 >叶片 ,植株顶部 >植株底部 ;不同生育期棉花硝酸盐含量变化明显 ,盛花期最低 ,蕾期最高。棉花倒四叶叶柄硝酸盐含量比较稳定 ,可以灵敏的指示棉花氮素营养状况 ,可作为棉花追肥推荐的诊断部位。棉花蕾期倒四叶叶柄硝酸盐含量与产量显著相关 ,可以灵敏地指示棉花氮素营养状况 ,可作为棉花追肥推荐的诊断时期。盛花期由于灌溉和追肥的影响 ,倒四叶叶柄硝酸盐含量只与硝酸盐含量微弱相关。初步确定了棉花蕾期氮素营养诊断指标和追肥推荐量。用反射仪快速准确测定棉花蕾期硝酸盐含量并进行追肥推荐 ,速度快 ,诊断结果可靠 ,是一项前景很广的农业技术。
Field experiments were conducted to study cotton nitrogen diagnosis and topdressing recommendation by measuring cotton tissue NO 3 - concentration with Reflectoquant . Results showed that the order of NO 3 - concentration in different cotton plant tissues is petiole > stem > leaf, and upper parties> lower parties. There was significant change in different growth period, that was, NO 3 - concentration in bud period was the highest whereas it was the lowest in flourish blooming period. NO 3 - concentration in the 4th expanding petiole is relatively stable and sensitively indicate cotton nitrogen state so it was chosen as diagnosis tissue. NO 3 - content in bud period was significantly correlated with seed cotton yield so it was chosen as diagnosis period. Primary cotton's nitrogen diagnosis index and amount of topdressing was formulated by method of regression of NO 3 - concentration against seed cotton yield. It was not only rapid and accurate but also timesaving and credible by using Reflectoquant to diagnosis cotton nitrogen states and side dressing recommendation, so it is an agricultural technical with grand prospect.
出处
《中国农业科学》
CAS
CSCD
北大核心
2002年第12期1500-1505,共6页
Scientia Agricultura Sinica
基金
中国科学院"百人计划"项目 (2 0 0 10 0 7)
新疆生产建设兵团农业局资助项目
关键词
新疆
棉花
氮营养诊断
追肥
推荐施肥
Cotton
N nutrition diagnosis
Topdressing recommendation
Xinjiang
