Six kinds of fertilizers are not suitable for growing vegetables.
Seed fertilizer refers to fertilizer applied at the same time as sowing or mixed with seeds. The role of seed fertilizer is mainly to meet the nutrient needs of seedling roots, because fertilizer is near the seeds, seedling roots can quickly absorb nutrients. Planting fertilizer has a great effect on vegetable seeds, such as proper selection can ensure the smooth germination of vegetable seeds and the healthy growth of seedlings, but some fertilizers are not suitable to be used as vegetable fertilizers, which should be paid attention to when buying. The chemical fertilizers that are not suitable for vegetable seed fertilizer are as follows: 1. Ammonium bicarbonate and ammonia have strong volatility and are easy to hurt seeds and seedlings. 2. Universal calcium is disadvantageous to seed germination and seedling growth, so it is not suitable to be used as seed fertilizer. 3. Urea can produce toxic effect on seeds and seedlings and affect seed germination, so it is not suitable to be used as seed fertilizer. 4. Ammonium chloride and potassium chloride will produce water-soluble chloride to burn out the seedlings after being applied to the soil, so it is not suitable to be used as seed fertilizer. 5. Fertilizers such as ammonia nitrate, potassium nitrate and potassium nitrate will affect seed germination and should not be used as seed fertilizer. 6. Strong alkaline fertilizers such as steel slag phosphate fertilizer and pit ash potash fertilizer are easy to burn seedlings and should not be used as seed fertilizer. Vegetable fertilizer, generally only need to apply a small amount of phosphate fertilizer or compound fertilizer.
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Skillful fertilization-- the principle of fertilizer use
What kinds of fertilizers are commonly used in apple orchards? The basic fertilizer of apple orchard is mainly organic fertilizer, combined with appropriate amount of nitrogen, phosphorus, potassium fertilizer and trace element fertilizer; topdressing mainly uses chemical fertilizer; when correcting element deficiency, it is necessary to apply trace element fertilizer on the basis of normal fertilization. (1) Organic fertilizer: loop compost, compost, chicken manure, human manure.
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The difference between hygienic insecticides and general pesticides
First, according to the climate characteristics and the law of diurnal activity of pests, the pesticide should be applied in a favorable period of time. The suitable time of application is from 9 am to 10:00 and after 4 pm. Because at 9: 10 in the morning, the dew on the crop leaves is dry, and it is the time when sunrise pests are most active. When the medicine is applied at this time, it will not be because of dew.
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