Excessive application of chemical fertilizers can also cause imbalances between nutrients. If the phosphorus is high, the zinc is insufficient, and the zinc deficiency in the soil must be iron deficiency. Excessive application of high-nitrogen and high-potassium fertilizers will inhibit the absorption of calcium ions in the soil by vegetables, causing calcium deficiency, which will affect the normal results of vegetables.
In fact, there is a limit to the amount of organic fertilizer required by vegetables. It is not the more organic fertilizers are applied. For greenhouses planted for more than 3 years, the application rate of organic manure such as chicken manure and duck manure should be controlled at about 3,000 kg per mu. For new sheds, organic fertilizer can be added as appropriate. For the old sheds planted for many years, it is necessary to pay attention to the application of humic acid fertilizer and biological bacterial fertilizer to increase the soil carbon-nitrogen ratio, loose soil ventilation, and salt damage. At the same time, according to crop demand, appropriate supplementation of trace elements such as boron and zinc to balance soil nutrition.
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