腐植酸对水培生菜产量和水分及养分利用的影响

通过营养液水培试验,研究了生育期不同腐植酸浓度对生菜产量和水分及养分利用的影响。结果表明,在0~1.41mg/g腐植酸浓度内,随着腐植酸浓度的增加,生菜地上部和地下部鲜干重随之增加,腐植酸浓度为1.41mg/g时,上述指标同时达到最大。腐植酸浓度在0~1.41mg/g内,随着其浓度的增加,生菜水分利用效率逐渐增大,对矿质元素的利用效率逐渐提高。腐植酸对生菜吸收矿质元素的影响不显著,不同的腐植酸处理,生菜吸收无机养分的能力不同。综合产量、水分和养分利用等因素,添加1.41mg/g的腐植酸可达到高产、节水、省肥的生产效应。

Effect of Humic Acid Application on Yield and Absorption of Water and Nutrients by Lettuce in Hydroponic Culture

Hydroponic experiment were done on the effect of humic acid application on yield and absorption of water and nutrients by lettuce.The results showed that the FW and DW of hydroponic lettuce increased with the humic acid concentration raising with 0~1.41 mg/g.The 1.41 mg/g concentration humic acid,which was the concentration of the highest volume for each aforementioned in-dex.Humic acid is cushion for the nutrient solution pH value.At the condition of 0~1.41 mg/g concentration humic acid,water use efficiency (WUE)and use efficiencies of mineral elements increased with the humic acid concentration rising.The effect of humic acid application on nutrient absorption of lettuce is not significant.The ability to absorb inorganic nutrients is different with different humic acid concentrations treatments.Synthesize the yield,water and nutrient absorption factor,effect of high yield,water saving, fertilizer production would achieve when humic acid with 1.41 mg/g concentration were added in Yamazaki formula.