Effect Of Integrated Management Of Irrigation And Fertilization On Fruit Yield And Quality And Fertilizer Use Efficiency Of Cherry Tomatoes

Integrated management of irrigation and fertilization is a modern agricultural management technique with the advantages of saving resources and protect the environment. The paper via the field and frame experiment under the condition of drip irrigation fertilization to research on the effect of growth, dry mass and nutrient accumulation and distribution, nutrient transport, fruit yield and quality, fertilizer use efficiency and the change soil nutrient content in cherry tomatoes on different fertilizer level, different species of nitrogen fertilizer and different ration between ammonium and nitrate. The results are as follows:(1) Integrated management of irrigation and fertilizer was not significant influence on the growth of cherry tomatoes. Among all,60%-70%of conventional fertilizer application of drip irrigation fertilization was the most beneficial to cherry tomatoes’stem girth and height increased. Calcium nitrate and urea was the nitrogen species which was the most conductive to the cherry tomatoes’plant height increased in the vegetative and reproductive growth period respectively. The optimum ratio of nitrogen fertilizer between ammonium and nitrate for increasing the stem girth and plant height was1:1.(2)60%-70%of conventional fertilizer application of drip irrigation fertilization was the most beneficial to dry mass accumulation of cherry tomatoes, continued reduction would reduce the accumulation of dry mass. Calcium nitrate was the nitrogen species which was the most conductive to the cherry tomatoes’dry mass accumulation. The optimum ratio between ammonium and nitrate for dry mass accumulation was1:3. (3) The nutrient accumulation of cherry tomatoes generally decreases with the increased of the fertilizer reduction amplitude Drip irrigation fertilization of different species of nitrogen fertilizer was not significant on the influence on the nutrient accumulation of the whole plant. The most benefit ratio of ammonium and nitrate for the cherry tomatoes to accumulate nitrogen was1:1, and1:3as phosphorus and potassium. Nutrient distribution of cherry tomatoes organs shows more stable while the ammonium and nitrate nitrogen were mixed to fertilize.(4) Any fertilization treatment could increase the fertilizer use efficiency and unit of fertilizer production, but there was not significant difference between different species of nitrogen fertilizer. Increasing the proportion of nitrate nitrogen fertilizer could improve the fertilizer use efficiency.(5) Drip fertilization has significant effects on yield and quality of cherry tomatoes.60%-70%of conventional fertilizer application was beneficial to form the yield and quality of cherry tomatoes. Drip irrigation fertilization of ammonium nitrogen fertilizer was beneficial to reduce the nitrate content of the fruits. It could increase the yield, weight, total sugar, Vc and sugar-acid ratio of cherry tomatoes while the ratio of ammonium and nitrate were1:3.To sum up, under the condition of60%-70%of conventional fertilizer application of drip irrigation fertilization neither had significant effect on the growth of cherry tomatoes, nor changed the law of the dry mass accumulation or distribution and nutrient absorption or utilization, but significant increased the fruit yield and quality of cherry tomatoes and fertilizer use efficiency. It was most beneficial to reduce nitrate content and increase the total sugar, Vc and sugar-acid ratio and so on while the ratio of ammonium and nitrate were1:3. Therefore, the ratio between ammonium and nitrate was1:3as60%-70%of conventional fertilizer application via drip irrigation fertilization is an appropriate mode of integrated management of irrigation and fertilization for cherry tomatoes.