棉花学报2023，Vol.35Issue(6)：473-486,14.DOI:10.11963/cs20230023
氮素对棉花幼苗生长、养分分配及氮素利用效率的影响
Effects of nitrogen on cotton growth,macronutrients distribution and nitrogen use efficiency
摘要
Abstract
[Objective]This study aims to screen the suitable nitrogen(N)concentration and investigate its effects on the growth,macronutrients uptake and N use efficiency of cotton at seedling stage.[Methods]HM3097 was used and cultured with nutrient solution for 21 d of six N concentrations with 0,0.04,0.4,1,4,8 mmol·L-1 Ca(NO3)2,named N0,N0.04,N0.4,N1,N4,N8,respectively.The root and shoot morphology,biomass,absorption and distribution of macronutrients,photosynthetic capacity,N uptake efficiency(NUpE)and N utilization efficiency(NUtE)of cotton seedlings were determined.[Results]With the increase of N concentration,the growth(include root and shoot),biomass,macronutrients accumulation and photosynthetic capacity of cotton seedlings increased first and then decreased,and 4 mmol·L-1 Ca(NO3)2 was the most appropriate N concentration for cotton at seedling stage,at which the cotton growth was the most vigorous.The maximum accumulations of N,P,K,and Ca of cotton seedlings were 34.4 mg,6.3 mg,41.6 mg,and 16.5 mg per plant,respectively,with the ratio of 1∶0.2∶1.2∶0.5.NUpE and NUtE were positively correlated with root-shoot ratio,and the change trend were also consistent with the root biomass distribution proportion,root average diameter,and the root macronutrients distribution proportion,which decreased with the increase of N concentration.In the range of 0-4 mmol·L-1 Ca(NO3)2,the contents of N,K,and Ca,leaf biomass and the shoot macronutrients distribution proportion all increased with the increase of N concentration.[Conclusion]4 mmol·L-1 Ca(NO3)2 was the most appropriate N concentration for cotton at seedling stage,which could significantly promote the absorption of N,P,K,and Ca of cotton seedlings.1 mmol·L-1 Ca(NO3)2 could increase the root macronutrients distribution proportion,promote root elongation and proliferation,and improve NUpE and NUtE.关键词
棉花/氮/根系形态/养分分配/光合作用Key words
cotton/nitrogen/root morphology/macronutrients distribution/photosynthesis引用本文复制引用
陈丹丹,王金玉,彭杰,谢晓麒,卢丽文,杜轩,孟令浩,杨国正..氮素对棉花幼苗生长、养分分配及氮素利用效率的影响[J].棉花学报,2023,35(6):473-486,14.基金项目
湖北洪山实验室项目(2021hszd006) （2021hszd006）
