The vegetable farmer in the ancient city street of Shouguang City changed his planting tomatoes in the past two years. The yield and benefits have been good, because he is more concerned with soil testing and fertilization. Last year, when measuring soil, his greenhouse soil organic matter reached 27.25g/kg, because of high soil organic matter content, this year did not use organic fertilizer, but according to 40 kg of compound fertilizer per mu, 75 kg of potassium sulfate applied base fertilizer. However, before the second chef spent the second spike, there was brick red material on the surface, and tomato roots grew poorly, which was obviously caused by the increase of soil salt damage. For future purposeful fertilization, the regular chef took soil samples to the Shouguang Soil and Fertilizer Testing and Research Center for soil testing.
The test results showed that the content of available potassium in Changshi's soil reached 1356.89 mg/kg, which greatly surpassed the requirement of 400 mg/kg for soil available potassium content; the total salt content in soil reached 2.38 g/kg. The high concentration of salt ions in the soil is mainly due to the large amount of potash fertilizer used by the regular chefs.
For the old shed, Shangyu vegetables absorb a large amount of nitrogen, phosphorus and potassium from the soil, but because of the large amount of base fertilizer used by the vegetable farmers before planting and the constant top dressing in the result period, it greatly exceeds the need for vegetable growth, resulting in soil. The remaining nutrients such as nitrogen, phosphorus and potassium are still very high, so the vegetable growers can use less or less fertilizer in the base fertilizer. In addition, the demand for potash fertilizer in vegetable seedlings is relatively small, and regular chefs should not use potassium fertilizers in large amounts.
Potassium fertilizers are present in an ionic state, which will lead to an increase in the total salt content in the soil. The salt damage will be aggravated and will not be conducive to the growth of vegetables. Potash fertilizers will also easily run off with water, causing waste of fertilizers; excessive use of potash will also affect tomatoes. Absorption and utilization of magnesium, iron, zinc, etc.
For the soil salt damage caused by the extensive use of potash by the regular chefs, the salt content in the soil can be reduced by using water pressure salt to wash the soil with too much salt.
At present, the content of organic matter in the regular master greenhouse is 23.84g/kg, and the content of organic matter in the soil is still high. The higher the content of organic matter in the soil, the more conducive to the improvement of soil buffering capacity. However, due to the fast decomposition of organic matter in greenhouse soil, it is advisable to use regular organic fertilizer for regular use in order to ensure organic matter content.
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