Tomatoes should be fertilized in tomato production. The production of 100 kg of tomato requires 0.4 kg of nitrogen, 0.45 kg of phosphorus, and 0.44 kg of potassium. According to the calculation of 5,000 kilograms per mu, 2000 kg of high quality organic fertilizer, 15 kg of ammonium sulfate, 50 kg of superphosphate, and 15 kg of potassium sulfate are used as base fertilizer before planting. When the first fruit is enlarged to the size of the egg, it should be top-dressed for the first time. The seedlings should be treated with 18 kg of ammonium sulfate, 15 kg of superphosphate, and 16 kg of potassium sulfate. When the third and fourth panicles are enlarged to the size of the eggs, they shall be topped off in a timely manner to apply "rich fruit fertilizers." In this case, a large amount of fertilizer is required, and the amount of fertilizer should be appropriately increased. Each time, the amount of ammonium sulfate 29 kg per acre, superphosphate 18 kg, potassium sulfate 20 kg. Each top dressing should be combined with watering. During the fruiting period, foliar spraying was performed with 0.1%-0.2% potassium dihydrogen phosphate and sessile fruit. Tomatoes cultivated in facilities must be given more organic fertilizer than open field cultivation, with less fertilizer applied, and combined with irrigation water application in order to prevent the occurrence of salt barriers.
In view of the fact that the current usage of tomato nitrogen fertilizer is generally high, resulting in accumulation of nitrogen and phosphorus in the soil, the imbalance of nitrogen, phosphorus and potassium nutrients supply and vegetable demand imbalance, resulting in problems such as soil quality, vegetable quality decline, etc. Follow the following principles:
1. Based on soil fertility conditions, comprehensive consideration should be given to the supply of environmental nutrients, and the amount of nitrogen and phosphorus fertilizers should be appropriately reduced.
2. The old vegetable shed should pay attention to the use of more compost containing more straw and less chicken manure, duck dung and other poultry manure, so that it can restore soil fertility and supplement carbon dioxide in the shed, which is also good for removing salt and reducing continuous cropping obstacles.
3, early spring temperature is low, soil nutrients supply is slow, early to keep up with fertilizers, in May after the reduction of nitrogen fertilization, increase the use of potash; early autumn high temperature, soil organic nutrient supply capacity, dominated by control, do not topdressing.
4. The recommended fertilization should be closely combined with reasonable irrigation. It is recommended to use sub-film furrow irrigation, drip irrigation, etc. Each irrigation per mu does not exceed 30 square meters, and sandy soil does not exceed 22 square meters.
5. For the tomato that grows in winter, grow sweet corn in summer and use it to achieve a reasonable crop rotation and overcome continuous cropping obstacles.
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