肥水互作对莴笋产量和硝酸盐含量的影响

Effect of fertilization and soil moisture on the yield and nitrate content of lettuce

通过盆栽试验研究了养分量比(NPK)和土壤水分互作对莴笋茎、叶产量和硝酸盐含量的影响。结果表明:不同处理莴笋茎、叶产量差异极显著。3个土壤水分下N2P3K1和N3P2K1处理对莴笋茎、叶产量的效应较好。随水分含量增加,莴笋茎、叶产量增加,不同土壤水分间莴笋茎、叶产量的比值大小以YW25/YW15>YW20/YW15>YW25/YW20。不同施肥处理莴笋茎、叶硝酸盐含量在3个水分下高低各异。随土壤水分含量的增加相同处理莴笋茎、叶硝酸盐含量表现出不同的变化规律。莴笋(茎、叶)硝酸盐含量以W25下较低。

In pot experiment, the effects of application ratio of N, P, K and soil moisture on the yield and nitrate in lettuce leaf and stem were studied. The results indicated that the yields of lettuce (stem and leaf) had significant difference. N_2P_3K_1 and N_3P_2K_1 treatments were better to the leaf and stem yield under three soil moistures. With the increment of soil moisture, the yield of lettuce increased. The ratio of yield of lettuce leaf and stem was in the order of Y_(W25)/Y_(W15)>Y_(W20)/Y_(W15)>Y_(W25)/Y_(W20).The nitrate contents in lettuce leaf and stem were different under different soil moisture. When the soil moisture was increased,nitrate contents of lettuce leaf and stem in same treatment had different change. The nitrate content of lettuce leaf and stem was lower under W25 soil moisture.