Application of Liquid Fertilizer Containing Humic Acids(UAN Type)on Leafy Vegetables
In order to investigate the application effect of liquid fertilizer containing humic acids(UAN type)on leafy vegetables,a field trial is conducted with competitive liquid fertilizer as the control and leaf mustard,Brassica chinensis L.,lettuce,and spinach as the experimental objects.The results show that compared with the control treatment,the plant height,aboveground and underground fresh weight of the four leafy vegetables treated with liquid fertilizer containing humic acids(UAN type)are higher than those of the control treatment.The relative chlorophyll content(SPAD value)of Brassica chinensis L.and spinach leaves is lower than that of the control treatment,while the SPAD value of leaf mustard and lettuce leaves is higher than the control treatment.The vitamin C content of the four leafy vegetables is lower than that of the control treatment,while the nitrate content is higher than that of the control treatment.
humic acidliquid fertilizerurea ammonium nitrate solution(UAN)leaf vegetablefertilizer efficiency test
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