Quality Improvement Efficiency of Hydroponic Lettuce after Replacement Two Nitrogen Level Nutrient Solutions by Nitrogen-free Solution

doi:10.7668/hbnxb.2015.S1.081

Abstract

Abstract: To analyze the effects of nitrogen level on nitrogen-free hydroponic solutions effectiveness and reveal the mechanism how nitrogen condition effect nitrogen-free hydroponic solutions effectiveness on lettuce.Purple lettuce was grown hydroponically under nitrogen level 10,15 mmol/L respectively,then cultivated with KCl solution for five days before harvest.The results showed that nitrogen-disruption treatment didn't change the biomass remarkably.The phenols relative contents didn't change significantly with the reducing of nitrogen levels before and after nitrogen-disruption treatment.And the contents of ascorbic acid and soluble sugar improved significantly and the nitrate contents of leaves and leaf blades dropped greatly after treated by nitrogen-disruption.The nitrogen-disruption treatment improved the nutritional quality of the lettuce strikingly without reducing production.And the ascorbic acid content increasing speed was effected by nitrogen level greatly,it enhanced significantly as the nitrogen level reduced.

Key words: Nitrogen-free, Nitrogen level, Lettuce, Quality, Hydroponic

CLC Number:

S143.1

YU Yi, YANG Qi-chang, LIU Wen-ke. Quality Improvement Efficiency of Hydroponic Lettuce after Replacement Two Nitrogen Level Nutrient Solutions by Nitrogen-free Solution[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2015, 30(S1): 446-448. doi: 10.7668/hbnxb.2015.S1.081.

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