BB fertilizer (large-grain blended fertilizer) is the latest fertilizer new product introduced in the 1990s. It is based on the soil fertility level, the crop needs and directly a large fertilizer NPK mixed fertilizers such as a fertilizer. After extensive exploration and research, the Soil Fertilizer Institute of Zhejiang Academy of Agricultural Sciences has applied a special sustained-release film on the nitrogen fertilizer in BB fertilizer, which has become a slow-release BB fertilizer with stable fertilizer effect. The fertilizer has been tested and demonstrated in the Dongshu Town of Donghu Town, Shaoxing City, Shaoxing City since 1997. Through continuous 3 years of practice, we have the following experience. First, slow-release BB fertilizer is a good fertilizer, it has the following advantages 1. Nitrogen, phosphorus and potassium nutrient ratios are flexibly formulated. Based on the determination of soil nutrient content, we used early- and late-season rice nutrients for different nutrient requirements to produce special slow-release BB fertilizers for early and late rice with higher phosphorus content in early rice and higher potassium content in late rice. Obviously, the real balanced balanced fertilization technology has been implemented; Fertilizer consumption is reduced and utilization rate is increased. Because the nitrogen fertilizer particles in the fertilizer are coated with a sustained-release film, the fertilizer effect is 20-30 days longer than the ordinary uncoated ones. The loss of leaching and volatilization is reduced, and the amount of fertilizer can be reduced by 10% to 20% compared with conventional fertilization. Easy to use, labor safety. The fertilizer has a high nutrient content (more than 40% of the active ingredient) and is easy to use in granular form. With the available fertilizer can be used as a one-time application of base fertilizer, fertilization labor reduction by about 1/3. With safe application, no fertilizer damage has occurred; 4. Save money and increase production. Due to the reduction in the amount of fertilizers and labor, the cost per mu is generally around RMB 30. According to the results of repeated experiments in six plots and multiple regional comparison tests, the fertiliser exhibited a steady and long-lasting fertility, no deterrence at later stages, and resistance to disease. The general yield increase ranged from 2.6% to 12.4% with an average of 4.5%. Increase production by about 20kg. Due to the increase in production costs, it is generally possible to increase the net income by about 50 yuan. At present, the fertilizer has been widely applied in our city, and it has been applied as the main measure in the 1999 National Comprehensive Agriculture Development Office project “Demonstration and Extension of Soil Testing and Fertilization Comprehensive Technology in Shaoxingâ€. Second, through three years of practice, we believe that the following issues should be paid attention to when applying slow-release BB fertilizers: 1. The soil nutrient content must be determined and the law of fertilizer requirement for crops should be mastered. On this basis, a reasonable fertilizer formula can be formulated to formulate various special applications. Slow release BB fertilizer; 2. In order to ensure the early-stage requirement of rice for nutrient, it is necessary to pay attention to the combination of quick-effect and steady-effect fertilizers when applying fertilizer. In general, our regular practice is to use ammonium bicarbonate 25 kg plus slow-release BB fertilizer 15-20 kg, all as base fertilizer one-time application, in order to meet the needs of rice early-onset; 3. Medium-term must strictly control the amount of fertilizer. Because the slow-release BB fertilizer does not produce fertilizer effect immediately as conventional fertilizer, many households think that fertilizer is not enough to supplement, and often there is too much fertilizer in the later period. Therefore, no fertilizer is generally applied in the mid-term. After replanting, the growth status of the rice seedlings can be adjusted as per mus of 0-5 kg ​​of urea as panicle fertilizer. We must strengthen publicity and education and gradually promote it. Sustained release of BB fertilizer is a new breed of fertilizer, which farmers do not understand very well. Therefore, promotion must use all propaganda tools to introduce its characteristics and fertilization points to farmers, and gradually demonstrate and popularize them by doing something.
