作 者：
李鹏程;郑苍松;孙淼;刘绍东;张思平;王国平;李亚兵;赵新华;董合林
单 位：
中国农业科学院棉花研究所/棉花生物学国家重点实验室
关键词：
土壤全氮含量;施氮水平;棉花;籽棉产量;氮肥利用率
摘 要：
为探讨不同土壤全氮含量水平下棉花的氮肥施用效应,采用盆栽试验,研究不同土壤全氮含量(0.58、0.64、0.74、0.83、1.29 g·kg~(-1))和施氮水平(每盆施加量分别为0、1.75、3.50 g)对棉花籽棉产量、氮素吸收、氮肥利用率的影响。结果表明,棉花单株籽棉产量和干物重随施氮量增加而显著增加,土壤全氮含量与施氮水平对棉株根、茎、铃壳部位的干物质积累具有显著的互作效应。同一土壤条件下,棉花单株氮素积累量随施氮水平增加而显著增加。氮肥表观回收率随土壤全氮含量上升呈先降后升的变化趋势,且在土壤全氮含量0.74 g·kg~(-1)时较低,但土壤全氮含量在0.58~0.83 g·kg~(-1)内,不同施氮处理间氮肥表观回收率差异不显著。氮肥农学利用率随土壤全氮含量增加呈下降趋势。土壤全氮含量0.74 g·kg~(-1)时的氮肥生理利用率高于土壤全氮含量0.58、0.64和0.83 g·kg~(-1)。土壤全氮含量1.29g·kg~(-1)条件下,低氮水平氮肥利用效率(表观回收率、农学利用率、生理利用率)显著优于高氮水平;土壤全氮含量0.58~0.74 g·kg~(-1)时,高氮可实现增产增效;土壤全氮含量0.83~1.29 g·kg~(-1)时,低氮能维持较高的产量和氮肥利用率。本研究结果为不同土壤全氮条件下棉花氮肥投入提供了参考。
译 名：
Effects of Total N Content of Soil and N Application Levels on Seed Cotton Yield and N Use Efficiency
作 者：
LI Pengcheng;ZHENG Cangsong;SUN Miao;LIU Shaodong;ZHANG Siping;WANG Guoping;LI Yabing;ZHAO Xinhua;DONG Helin;State Key Laboratory of Cotton Biology/Institute of Cotton Research of Chinese Academy of Agricultural Sciences;
关键词：
total N content of soil;;N fertilization levels;;cotton;;seed cotton yield;;N use efficiency
摘 要：
In order to study the effect of total N content of soil and nitrogen( N) fertilizer application level on dry matter accumulation,seed cotton yield and N use efficiency of cotton,a pot experiment was carried out with five total N contents of soil( 0. 58,0. 64,0. 74,0. 83,and 1. 29 g·kg~(-1)) and three N application levels( 0,1. 75,3. 50 g of every pot,respectively). The results showed that seed cotton yield and dry matter weight of cotton plant increased significantly with the increase of N application level,and N application level and total N content of soil had significant interaction effect on dry matter accumulation of root,stem,and boll shell in cotton plant. Under the same total N content of soil,N accumulation of the cotton plant increased significantly with the increase of N application level. Apparent N recovery of cotton plant decreased when total N content of soil increased from 0. 58 to 0. 74 g·kg~(-1),then increased when total N content of soil was 0. 83 g·kg~(-1)and declined when total N content of soil was 1. 29 g·kg~(-1). No significant differences were found in N recovery of cotton plant under different N application level when total N content of soil ranged from 0. 58 to 0. 83 g·kg~(-1). Agronomic N use efficiency of cotton plant declined with the increase of total N content of soil,while physiological N use efficiency with total N content of soil 0. 74 g·kg~(-1)was higher than that with total N content of soil0. 58,0. 64 and 0. 83 g·kg~(-1). When total N content of soil was 1. 29 g·kg~(-1),apparent N recovery,agronomic N use efficiency and physiological N use efficiency of cotton plant at low N application level was significantly superior to that at high N application level. When total N content of soil ranged from 0. 58 to 0. 74 g·kg~(-1),higher N input improved both seed cotton yield and N use efficiency,while when total N content of soil ranged from 0. 83 to 1. 29 g·kg~(-1),less N input could maintain both higher seed cotton yield and N use efficiency. The results should provide references for input of N fertilizer in cotton field under different total N content of soil.
