Effects Of Nitrogen Application On Absorption And Distribution Of Nutrition And Yield-Quality On Processing Tomato

Field plot experiment was conducted by modified nitrogen application(NO-no N,N1- 150 kg/hm~2, N2-300 kg/hm~2 and N3- 450 kg/hm~2) on tomato in this study.The objective of the study is to measure the contents of N,P and K in different organs of the plant during the different organ nitrogen,phosphorus and potassium,and to measure the quality of tomato parameters.The results combined with the outputs the concentrations of nitrate during different periods of leaves,the effects of nitrogen application on absorption and distribution of nutrition and yield-quality on processing tomato was investigated.The main results are as follows:1.The nutrient accumulation and distribution of the accumulated of total volume in various stages of the processing of tomatoes were affected by different nitrogen fertilizer rate,while the trend of the accumulation of total nutrient was not affected.The nutrient accumulation of processing tomato was represented as "S"-type.The accumulation rate was slow during seedling stage,was to accelerate during early flowering,and was fastest before the prolific period.Then,the accumulation rate was slow down.2.The demands of N and K were far greater than that of P for the processing tomato;Nitrogen application can greatly promote the absorption of nitrogen of the processing tomato.The absorption of N, P and K in N treatment were 75.8%~189.2%,82.1%~162.7%and 104.9%~176.8%more that in no N treatment,respectively.Among a certain scope of N contents,the absorption of N,P and K of processing tomato were increased with the increase of nitrogen application rate,while the absorption rates were decreased with too much nitrogen.Excessive nitrogen will extend the period of strong growth of the processing tomato.3.The outputs of Tomato was obviously increased by nitrogen fertilizer application.The economic output was 95259 kg/hm~2 by reasonable application of nitrogen(N2),which was a twice time more than that of N0.The increase production was 50812 kg/hm~2,while increase income was 27,303 yuan/hm~2.The nitrate concentration of petiole was increased with the increase of nitrogen application rate.However,After the pilot schools found that before the prolific period nutritional diagnosis of processing tomato as a more reasonable period of time,the diagnostic critical values is 4182 mg/kg.4.Reasonable application of nitrogen can improve the nutritional quality of processed tomatoes, while excessive application of nitrogen fertilizer results the decrease of the nutritional quality.The more nitrogen is added,the lower the proportion of sugar-acid is.Therefore,it's best not to apply nitrogen.