Effect Of Mixed Controlled-Release Fertilizer On Greenhouse Tomato

Due to slow/controlled release fertilizer nutrient release and crop absorption synchronization, leaching to reduce nitrogen fertilizer volatile, so as to promote crop growth and yield and fertilizer use efficiency increased, but the slow/controlled release fertilizer membrane material prices higher. Controlled release blend the characteristics of of fat both release fertilizer ordinary fertilizer production process is simple, low cost, slow/controlled release the mast area of promotion the main direction. In greenhouse vegetable cultivation in the presence of low fertilizer use, soil nutrient supply imbalance, the poor quality of the vegetables and the negative impact on the environment, selection of low-cost, controlled-release period120d, biodegradable, water-soluble polymers package film urea, using the method of combining indoor simulation experiments with greenhouse plot experiment, the study of nutrient release characteristics of controlled release blend fertilizer and its application in greenhouse tomato effect, in order to release blend bulk fertilizers in the application and popularization of solar greenhouse provide a theoretical basis. The main findings are as follows:1. The controlled release urea in the thermostat hydrostatic release was "S" shaped curve, the whole process can be divided into three phases:the slow release rate increased, rapid increase and gradual reduction stage. Controlled release urea significantly speed up the release rate in the first7days,28days fertilizer nutrients accumulated emission reached16.03%,121days nutrient release rate of85.37%. Differential solubility of nutrients was0.72%, basically meet the demand of tomatoes throughout the growing period of nitrogen nutrition.2. Controlled release urea can effectively reduce nitrogen volatilization control nitrogen than0,25%,45%,65%,100%of the processing ammonia volatilization compared with the ordinary urea, ammonia volatilization decreased by19.88%,25.94%,42.84%,46.13%. Each treatment28days in culture, volatilization peaked.3. Fertilization treatments can significantly increase soil nitrogen and nitrogen content, the ordinary urea soil total nitrogen content and nitrogen content was a downward trend has been to control nitrogen25%and45%for total nitrogen content was first decreased and then increased trend. Nitrogen control65%of the treatment and control of nitrogen100%of soil total nitrogen content has been increased. Control nitrogen than the soil nitrogen content decreased first and then a small increase.4. Each treatment can significantly increase soil nitrate content, the curve of each treatment. The ordinary urea treatment in a relatively short period of time, the highest soil nitrate content. The blending processing, soil nitrate content reached the highest value of time is extended with the increase in the ratio of nitrogen control. The ammonium nitrogen of each treatment is first at a small increase, followed by a gradual decline. The CRNF treatment at a later stage can significantly increase soil urease activity.5. Control nitrogen than processing plant height, stem diameter, number of leaves, leaf area than ordinary urea treatment significantly increased. T5, T6to deal with the most obvious. Tomato planting60days, T5processing plant height, stem diameter, number of leaves, leaf area than ordinary fertilization treatments, respectively, an increase of6.93%,6.06%,6.91%,6.92%.6. Release fertilizer blending fertilizer significantly increased rate of Pn, Tr, Gs, Ci, the T5treatment is better. Each treatment significantly increased the chlorophyll content of the tomato growth period. The NR of the treatment5is the highest. Significant reduction fertilization treatment than ordinary urea treatment effect7. Each treatment can increase the tomato plants N, P, K content, control nitrogen than100%treatment in various periods of N, P, K content is always at a high level. The curve of N, P, K content of each treatment is similar. The tomato quality the T5treatment is the best.8. Each treatment than ordinary urea were increased by15.69%to27.92%, the highest yield in T6. The various processing nitrogen use efficiency of9.08%～17.35%, T5highest. T6is in the best economic performance. The fertilizer rate of the treatment of T7is15.1%.