Effects for the Different Proportion of Nitrogen,Phosphate and Potassium on the Quality of Greenhouse Tomatoes

Using'L-402'tomato as test material,effects for the different proportion of nitrogen,phosphate and potassium on tomatoes quality were studied in greenhouse by the method of'311-B'optimummixed design.The results showed that the amount of accumulated nitrate in tomato were increased by the excessive quantity of nitrogen or potassium.And that would be reduced by appropriately increment of phosphate.The sugar content was increased by increasing the amount of phosphate,and the level of the suger content soluble sugar,vitamin C and amino acid was improved by increasing the amount of potassium.So the nutritional quality of tomato would be improved through the appropriate application of nitrogen,phosphate and potassium.In the test conditions,the optimal measures for height quality ware nitrogenous fertilizer(N)of 75.0 kg/hm2,the phosphate fertilizer(P2O5)of 160.8 kg/hm2,the potasium fertilizer(K2O) of 352.0 kg/hm2.