When planting crops, we can adjust the fertilizer application according to the total salt content of the shed.
In recent years, due to the large investment in fertilizers, many vegetable farmers have begun to pay attention to soil testing and fertilization in order to reduce investment. Like Liu Shifu, a vegetable farmer in the ancient city of Shouguang City, after taking the garden in the greenhouse, he took the soil samples to the Shouguang City Soil and Fertilizer Testing and Research Center for soil testing, in order to understand the content of various nutrients in the greenhouse soil, and then targeted fertilization. At the same time as reducing the input of fertilizer, the vegetables in the shed should be of high quality and high yield.
The test showed that the total salt content in the soil of Master Liu's greenhouse reached 2.68g/kg, which exceeded the requirement of 2.0g/kg for the growth of suitable vegetables. This is mainly due to the excessive potassium and phosphorus in the soil, so pay attention to change. The amount of fertilizer applied reduces the total salt content in the soil.
First of all, the organic matter content in the soil of Master Liu's greenhouse is 18.92g/kg, which is different from the requirement of 20.0g/kg of organic matter suitable for vegetable growth, so it should continue to increase the application of organic fertilizer. It is recommended that Master Liu apply about 15 square meters of rice husk or chicken manure into the soil during high temperature suffocation in summer, and increase the application of biological fertilizer to promote the fermentation of manure at high temperature and suffocate, and quickly convert manure into soil organic matter. The fermenting of manure is used to improve the soil, promote the formation of soil aggregate structure, and utilize the adsorption of mineral particles on the soil to reduce the influence of salt in the soil on the roots of vegetables.
Second, increase the application of nitrogen fertilizer. The nitrogen content of Liu Shifu's soil is 68.00mg/kg, which is lower than the requirement of 80-120mg/kg of soil hydrolyzed by suitable vegetables. So Master Liu can increase the application of nitrogen fertilizer when the greenhouse is swelled at high temperature, such as 30-35 per acre. About a kilogram of diammonium to increase the content of nitrogen in the soil. At the same time, the nitrogen in the diammonium is ammonium nitrogen, which can be converted into nitrate nitrogen with the fermentation of organic fertilizer when the temperature is suffocated at high temperature, thereby avoiding the loss and volatilization of nitrogen fertilizer with water and improving the utilization of fertilizer. rate. After the vegetables are planted, the use of nitrate nitrogen fertilizer can be used.
Again, reduce the amount of phosphorus and potassium fertilizer used. The content of available phosphorus in the greenhouse of Master Liu is 142.03mg/kg, which can reduce the amount of phosphate fertilizer. Because the organic matter content in the soil is low, most of the phosphate fertilizer in the soil is fixed by the soil, so it should continue to be used. It can be used in an amount of about 150 kg of fertilizer with a phosphorus content of 15% per acre, and can be used according to half of the general application and half of the concentrated use of the planting line to increase the utilization rate of the phosphate fertilizer. For potash fertilizer, the available potassium content in the soil reaches 539.0mg/kg. Master Liu can use 20-30 kg of potassium fertilizer in the base fertilizer, which is 1/3-2/3 of the normal potassium fertilizer dosage, then Note that after the vegetable is planted, when it enters the flowering result period, it can be supplemented by means of flushing. In order to prevent the accumulation of potassium fertilizer in the soil, it is best for the vegetable farmers to apply the fertilizer with high utilization rate when planting the fertilizer, such as “Lighthouse†brand water-soluble fertilizer, Fangrun, etc., 5-8 kg per acre. Just fine.
(Le Qing)
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