摘要
以长叶莴苣 (Lactucasativavar.longifoliaLam .)为试材 ,研究了NFT栽培条件下莴苣水分与养分吸收特性 ,以及NFT对其生长发育的影响。试验结果表明 ,莴苣蒸腾效率前期 >中期 >后期 ;整个生育过程中 ,P、K、Mg的吸收成分组成浓度 (养分与水分吸收比 ,n/w)均低于原始营养液浓度 ,而Ca则相反 ;NO-3 N因处理浓度不同而异。叶片中各无机成分含量随生育过程而提高 ,同一生育期随营养液浓度提高而增加 ;综合莴苣产量因子与商品性状 ,以 3/4倍园试均衡液最佳。
The absorption of moisture and nutrient and their effects on the growth and development of Lactuca sativa var.longifolia Lam.in NFT culture were sudied.Results are the following:the transpiration rate of leaves at early stage>that at mid-stage>that at later stage.Throughout the grwoth duration,the absorptive component content(n/w)of P,K and Mg were lower than that in the initial nutrient solution,respectively,but Ca was contrary.The n/w value of NO - 3-N varied with treatments,The contents of inorganic component in leaves increased along with growth pace,and varied with the solution concentration at the same stage.Summing up the yield factors and commercial characters,we concluded that 3/4 strength of Enshi nutrient solution was optimum.
出处
《园艺学报》
CAS
CSCD
北大核心
2003年第2期152-156,共5页
Acta Horticulturae Sinica
基金
国家教育部留学基金项目 (978110 34)
