First, the nutritional characteristics of growth.
Nitrogen makes tomatoes grow vegetatively, which is beneficial to flower bud differentiation, development and fruit enlargement. Tomatoes hi absorb nitrate fertilizer, ammonium nitrogen fertilizer if excessive, it will seriously affect fertility. When nitrate-nitrogen fertilizer is applied, the content of organic acids in tomatoes increases rapidly, and mineral cations also increase. Excessive or improper application of nitrogen fertilizer can easily cause plants to grow and fall. Phosphorus can promote tomato root growth, accelerated flowering and fruiting, increase yield and quality. Growth is inhibited in the absence of phosphorus and fruit ripening is delayed. When the phosphorus is severely deficient, the leaf back is purple-red, the root system is underdeveloped, and there is a flower falling phenomenon. Potassium can improve resistance to disease tomatoes, so that uniformly colored fruit. At the same time, it can also reduce the flowering fruit, and the amount of potassium needs to increase during the period. Different potassium fertilizers have different effects on fruit quality. Adding proper amount of sodium chloride to potassium chloride usually increases the sugar content in the fruit . Tomatoes have high calcium content and must be supplied frequently. Calcium deficiency can easily cause physiological blockage. In order to prevent browning of the fruit, increase the yield and sugar content, it is very effective to apply a small amount of boron fertilizer at the time of sowing.
Second, fertilization technology.
　　 1. Seedling fertilizer: 11 m2 on the seedbed into the decomposition of manure mixture of 100 to 150 kg, 1 kg incorporation superphosphate, potassium chloride 0.3 kg mix thoroughly. It can cultivate strong seedlings and promote flower bud formation and development. 2. Seedling stage topdressing. Combination of water, into the decomposition loose stool or 0.1% to 0.2% depending on the urea You seedlings case, slips may not topdressing. 3. Reapply the base fertilizer. According to the output of 5000 kg per mu , 5000 to 7000 kg of high- quality organic fertilizer , 25 to 50 kg of superphosphate and 10 kg of potassium fertilizer are applied . 4. Promote seedlings. When the soil is insufficient, when the seedling water is poured, 500 kg of diluted manure water or 10 kg of ammonium nitrogen fertilizer is applied per mu . When enough base fertilizer, can not chase all over this fat. 5. Promote fruit fertilizer. When the first ear is swollen, apply 500 to 1000 kg of manure or 15 to 20 kg of fertilizer when watering . This topdressing should be timely to prevent fruit malnutrition. 6. Sheng fruit fertilizer. The second and third ears, when rapidly expanding, topdressing 2 to 3 times, each application of nitrogen fertilizer 13 to 20 kg per acre , the first time after topdressing can apply 10 to 15 kg of calcium phosphate . Meet the rapid growth of fertilizer, prevent premature aging, and promote fruit fullness. 7. Shengguo late fat. It can be combined with anti-drug and foliar application of 0.3% to 0.5% potassium dihydrogen phosphate to prevent premature aging and improve fruit quality and yield.
Third, the fertilization index for the production of 1000 kg of tomatoes, the need for nitrogen 2.7 kg, phosphorus 0.7 kg, potassium fertilizer 5 kg.
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