Identify and identify the characteristics of crop damage, mainly as follows:
1. Dehydration. If the fertilizer is excessive, or the soil is too dry, the local concentration of the soil will be too high after fertilization, which will cause the crop to lose water and become wilting.
2, burns. At high temperatures in the hot sun, the application of volatile chemical fertilizers (such as ammonium bicarbonate) causes the leaves or young tissues of the crop to be burned (burning).
3. Poisoning. The "biuret" component in urea exceeds 20%, or the free acid content in superphosphate is higher than 5%. After application to the soil, the roots of the crop are poisoned and rotted; a large amount of unfertilized organic fertilizer is applied due to its decomposition. Heats up and releases harmful gases such as methane, causing toxicity to crop seeds or roots.
Prevention 1. Select standardized fertilizer.
2, the right amount of topdressing. The ammonium bicarbonate should not exceed 25 kg per acre, and pay attention to deep application, cover soil or cultivating after application; urea per mu application is controlled below 10 kg; when applying foliar fertilizer, the appropriate concentration of various trace elements is generally Between 0.01% and 0.1%, a large number of elements (such as nitrogen) should be between 0.3% and 1.5%, and should be sprayed in strict and appropriate amount according to the specified concentration.
3, seed fertilizer isolation. When planting dry crops, it is advisable to first apply the fertilizer and mix it into the soil layer to avoid direct contact with the seeds.
4. Reasonable water supply. When the dryland soil is too dry, it is advisable to apply water after appropriate irrigation or fertilize the fertilizer; when applying fertile chemical fertilizer in the paddy field, it is advisable to maintain a suitable shallow layer in the field and then cultivate the field immediately after application.
5, the fertilizer is evenly applied. When applying fertilizer, pay attention to uniformity. If necessary, mix with appropriate amount of mud powder or fine sand.
6, timely fertilization. Generally, it should be mastered after the sunrise dew is dry, or fertilized in the afternoon, and should not be carried out in the air in the hot sun. In addition, it is necessary to adhere to the application of organic fertilizer by tanning. During the process of applying fertilizer, care should be taken to place the unfertilized fertilizer in the downwind to prevent the volatilized gas from being blown to the crop by the wind to avoid injury.
If the above-mentioned fat damage occurs in the crop, it is advisable to take appropriate measures such as appropriate irrigation, drainage, or removal of the affected part to control its development and promote normal growth.
1. Dehydration. If the fertilizer is excessive, or the soil is too dry, the local concentration of the soil will be too high after fertilization, which will cause the crop to lose water and become wilting.
2, burns. At high temperatures in the hot sun, the application of volatile chemical fertilizers (such as ammonium bicarbonate) causes the leaves or young tissues of the crop to be burned (burning).
3. Poisoning. The "biuret" component in urea exceeds 20%, or the free acid content in superphosphate is higher than 5%. After application to the soil, the roots of the crop are poisoned and rotted; a large amount of unfertilized organic fertilizer is applied due to its decomposition. Heats up and releases harmful gases such as methane, causing toxicity to crop seeds or roots.
Prevention 1. Select standardized fertilizer.
2, the right amount of topdressing. The ammonium bicarbonate should not exceed 25 kg per acre, and pay attention to deep application, cover soil or cultivating after application; urea per mu application is controlled below 10 kg; when applying foliar fertilizer, the appropriate concentration of various trace elements is generally Between 0.01% and 0.1%, a large number of elements (such as nitrogen) should be between 0.3% and 1.5%, and should be sprayed in strict and appropriate amount according to the specified concentration.
3, seed fertilizer isolation. When planting dry crops, it is advisable to first apply the fertilizer and mix it into the soil layer to avoid direct contact with the seeds.
4. Reasonable water supply. When the dryland soil is too dry, it is advisable to apply water after appropriate irrigation or fertilize the fertilizer; when applying fertile chemical fertilizer in the paddy field, it is advisable to maintain a suitable shallow layer in the field and then cultivate the field immediately after application.
5, the fertilizer is evenly applied. When applying fertilizer, pay attention to uniformity. If necessary, mix with appropriate amount of mud powder or fine sand.
6, timely fertilization. Generally, it should be mastered after the sunrise dew is dry, or fertilized in the afternoon, and should not be carried out in the air in the hot sun. In addition, it is necessary to adhere to the application of organic fertilizer by tanning. During the process of applying fertilizer, care should be taken to place the unfertilized fertilizer in the downwind to prevent the volatilized gas from being blown to the crop by the wind to avoid injury.
If the above-mentioned fat damage occurs in the crop, it is advisable to take appropriate measures such as appropriate irrigation, drainage, or removal of the affected part to control its development and promote normal growth.
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