【摘要】 选用NFT主栽生菜品种为材料 ,采用通用营养液配方 ,研究了不同培养液浓度对生菜生长发育的影响。结果表明 ,浓度为 5 /4倍时生育最好 ,产量最高 ,其余的依次为 1倍 >3/4倍 >3/2倍 >1/2倍 >1/4倍。但从生产实用性综合选择 ,以 3/4倍浓度最适。形成产量差异的原因是 :适宜浓度下 ,生菜分化叶片快 ,叶绿素含量高 ,叶形比低 ,叶片生长快 ;发根早 ,根系多 ,根重大。叶片和根系中N ,P ,K ,Ca ,Mg含量与培养液浓度并不成线性关系。更多还原

【Abstract】 A mainly used variety and a commonly used formula were adopted to study the effects of solution concentration on growth and development of lettuce.Fastest leaf differentiation and growth,highest chlorophyll content,lowest leaf shape ratio,earliest rooting and most flourishing roots were observed.The results indicated that plants under the 5/4 St treatment grew best and bore highest yield.The rest are 1St,3/4St,3/2St,1/2St and 1/4St,successively.However,the optimal selection for practical use is 3/4St,which cost less than 5/4St.The contents of N,P,K,Ca and Mg both in the leaf and in the root are not linear to the solution concentration.更多还原