EDTA螯合钙对无土栽培生菜生长及品质的影响

以"富兰德里"生菜(Lactuca sativa‘Flandria’)为试材,采用基质栽培的方法,研究了EDTA螯合钙对无土栽培生菜生长的影响,以期探索用EDAT螯合钙替代游离钙离子作为无土栽培营养液钙源的可行性,避免营养液施配过程中钙肥有效性降低的问题。结果表明:与对照CK相比,T1、T2处理生菜在冠部鲜质量、品质性状上未表现出明显差异,且符合生产商品性要求。随着营养液螯合钙浓度的进一步增大,生菜的SPAD值虽然有所增加,但累积蒸腾耗水、地上部鲜质量和营养液利用效率均受到显著抑制。因此,采用螯合钙剂作为无土栽培作物营养液的钙源时,要注意控制营养液的螯合钙浓度不宜超过20 mg·L^-1,防止产量降低、营养液利用效率下降。

Effects of Chelating Calcium on Growth and Quality of Soilless Lettuce

Taking lettuce(Latuca sativa L.cv.‘Flandria’)as experimental materials,the method of substrate culture was used,in order to study the effect of chelating calcium(EDTA-Ca)on growth of lettuce in greenhouse and investigate the feasibility of chelated calcium replacing free calcium ions as the calcium source of nutrient solution,which could avoid decreasing the availability of calcium fertilizer in nutrient solution.The results indicated that there were no significantly difference in shoot fresh weight and quality among treatments T1,T2 and control.The commodity character of lettuce was also good for the treatments T1 and T2.With the increasing of EDTA-Ca concentration in nutrient solution,the SPAD value of lettuce was increased,but the accumulated transpiration,shoot fresh weight and nutrient solution use efficiency were significantly decreased.Therefore,when the EDTA-Ca could be used as calcium fertilizer source for nutrient solution making under soilless culture condition,the concentration of EDTA-Ca should not be higher than 20 mg·L^-1 to avoid reducing the yield and nutrient solution use efficiency.