Effects Of Contolled-release Fertilizers On Dynamic Changes Of Nutrient And Fruit Quality Of Vegetable Of Nightshade

Many studies showed that CRFs nutrient release rate was accordant with plant nutrientabsorption, they could improve the use efficiency of fertilizer. In this paper, release in waterexperiment, tomato potted plant and plug –seedling, capsicum potted plant was conducted forthis study. The purpose of this paper was: 1)to illustrate nutrient efficiency and the dynamicchange of nutrient availability in soil and plant 2) to increase the effects of quality invegetable of nightshade after using CRFs, The research results were as follows:1.The nutrient release curve of CRFs in water showed a shape of parabola or "S". Threerelease stages were found in CRFs releasing curve. Release rate increased with time in thefirst stage , fastigium and decreased with time in the third stage. The fastigium of release ratebetween the two stages could content plant nutrient needing in maturation and expanding of agreat lot fruits.2. The effects of the CRF on the tendency of the vegetables of nightshade: The coatedCRF was meet demand in plant was it supplied by its constant release nutrient, and because ofthe lagging of release , can meet the nutrient demand of later period of terminal fructification.In the course of growth of the plants, the constant supply of the nutrient, had promoted theabsorption of the nutrient of plants: Having raised the content of chlorophyll, especially thebest fruiting period when a large amount of fruit was riping, the content of chlorophyll oftreatments of CRF was higher than treatments of CCF; Promoting buds to split up and playinga role in increasing production and benifit.3. The effects of the coated CRF on the quality of the vegetables of nightshade : Thequality of the vegetables of nightshade could be improved evidently by using CRF. Thequality of fruit could be increased markedly at the lower fertilization, the proportion ofnitrogen potassium of tomato is 1:1.75 and the capsicum is 1:1.2. ,moreover,,soluble protein,soluble sugar , content of dissociating aminophenol and Vc were the highest, 10-25percentage points higher than other treatments of CRF and CCF of using more fertilizers,showing that using CRF needs certain nutrient proportion too..