摘要
采用盆栽方法,在0、0.05、0.1、0.15、0.2 g/kg 5个N水平下对甘蓝型油菜13号（N高效基因型）和4号（N低效基因型）的N效率、N吸收效率、N利用效率,生物学产量、籽粒产量以及农学性状进行了比较研究。结果表明,在N水平0~0.2 g/kg,油菜N效率和吸收效率随N水平增加呈降低趋势,N利用效率则随N水平增加呈先增加后降低趋势;N高效基因型的N效率和吸收效率比N低效基因型对N响应更敏感。N高效与低效基因型的N效率、N吸收效率的差异在N水平较低时更显著。N水平对不同N效率油菜的生长具有相似的影响,N高效基因型的单株产量、根系生物量、地上部分生物量、总生物量、各器官生物量占总生物量的比例、单株角果数、千粒质量、株高、第一分枝高度和一级分枝数等随N水平变化而变化的规律均与N低效基因型的基本一致。N高效基因型的单株产量、根系生物量、地上部生物量、总生物量、根系、茎叶和籽粒占总生物量的比例、根冠比、收获指数、单株角果数、角果粒数、株高、一级分枝数和茎粗均高于N低效基因型,角果皮占总生物量的比例、千粒质量和第一分枝高度低于N低效基因型,其差异显著性随N水平变化而不同。
N-efficient Canola genotype （No. 13） and N-inefficient genotype （No. 4） were grown in pots under different rates of nitrogen fertilizer （0,0.05,0.1,0.15,0.2 g N/kg soil）. The nitrogen efficiency and its components nitrogen uptake efficiency and nitrogen utilization efficiency, biomass,grain yield, and agronomic traits of two canola genotypes were compared. In the range of 0 to 0.2 g/kg,N efficiency and N uptake efficiency of two canola genotypes decreased with N rate increasing while N utilization efficiency increased in the lower N rate and then decreased in the higher N rate. N efficiency and N uptake efficiency of N-efficient genotype was more sensitive to N rate than that of N-inefficient genotype. The difference of N efficiency and N uptake efficiency between different genotypes was greater when less N fertilizer was applied. N-efficient genotype and N-inefficient genotype showed similar trend that grain yield, roots biomass, shoot biomass, total biomass, percentage of different parts biomass in whole plant biomass, silique number per plant, 1000-seed weight, height, the fist valid branch height and primary branches number fluctuated with the increase of N rate. N-efficient genotype had higher grain yield, roots biomass, shoot biomass, total biomass, percentage of root biomass in whole plant biomass,percentage of stem and leaves biomass in whole plant biomass,percentage of grain biomass in whole plant biomass,root to shoot ratio,harvest index,silique number per plant,seeds per silique,height, primary branches number and stem diameter than N-inefficient genotype, while it had lower percentage of silique wall biomass in whole plant biomass, 1000-seed weight and the fist valid branch height than N-inefficient genotype. However,the differences varied according to N rate.
出处
《西北农业学报》
CAS
CSCD
北大核心
2010年第6期99-105,共7页
Acta Agriculturae Boreali-occidentalis Sinica
基金
教育部"新世纪优秀人才支持计划"项目(NCET-08-0465)
西北农林科技大学"青年学术骨干支持计划"项目
关键词
氮效率
油菜
氮肥
Nitrogen effieiency
Canola
Nitrogen fertilizer
