Crop foliar topdressing (root top dressing) is very common, and it is an effective way to quickly supplement nutrition, promote crop growth and increase yield. However, the concentration of foliar fertilizer is very important. If the concentration is too high, it will cause fat damage, "burning" the damaged leaf surface and tissue; if the concentration is too low, the fertilizer effect is not obvious. The concentration of several commonly used foliar fertilizers is described below.
1. Urea: The usual spray concentration is 1-1.5% (ie 100 kg water plus 1-1.5 kg urea). Dicotyledonous plants, the lower limit of concentration; monocotyledon, the upper limit of concentration can be taken; the seedling stage, the concentration can be appropriately lower; in the seedling stage, the concentration can be appropriately higher.
2. Potassium dihydrogen phosphate: a commonly used spray concentration of 0.1-0.3%. The preparation method is to take 100-300 g of potassium dihydrogen phosphate plus 100 kg of water, and fully dissolve and spray.
3. Superphosphate: The commonly used spray concentration is 2-3%. After the fertilizer is added with water, it should be thoroughly stirred. After standing for 24 hours, it is filtered and the supernatant is sprayed.
4. Potassium sulfate: The commonly used spray concentration is 1-1.5%.
5. Zinc Sulfate: The commonly used spray concentration is 0.1-0.2%. Spray a small amount of lime solution in the solution.
6. Ammonium molybdate: The commonly used spraying concentration is 0.05-0.1%.
7. Borax (or boric acid): The usual spray concentration is 0.2-0.3%. When preparing the solution, first dissolve the borax with a small amount of 45 ° C hot water, and then the water.
8. Grass ash: The commonly used spray concentration is 3-5%. After adding water with grass ash, the mixture was stirred, allowed to stand for 15 hours, and then filtered for reuse.
9. Rare earth: The spraying concentration for vegetables and food crops is 0.05%, and that of fruit trees is 0.08%.
10. Increasing bacteria: The spraying concentration of field crops is usually 15-30 ml, and spraying 40-50 kg of water. The fruit trees are sprayed with 80-100 ml of water and 100-150 kg of water.
Huaxian County Shang Hongyan
1. Urea: The usual spray concentration is 1-1.5% (ie 100 kg water plus 1-1.5 kg urea). Dicotyledonous plants, the lower limit of concentration; monocotyledon, the upper limit of concentration can be taken; the seedling stage, the concentration can be appropriately lower; in the seedling stage, the concentration can be appropriately higher.
2. Potassium dihydrogen phosphate: a commonly used spray concentration of 0.1-0.3%. The preparation method is to take 100-300 g of potassium dihydrogen phosphate plus 100 kg of water, and fully dissolve and spray.
3. Superphosphate: The commonly used spray concentration is 2-3%. After the fertilizer is added with water, it should be thoroughly stirred. After standing for 24 hours, it is filtered and the supernatant is sprayed.
4. Potassium sulfate: The commonly used spray concentration is 1-1.5%.
5. Zinc Sulfate: The commonly used spray concentration is 0.1-0.2%. Spray a small amount of lime solution in the solution.
6. Ammonium molybdate: The commonly used spraying concentration is 0.05-0.1%.
7. Borax (or boric acid): The usual spray concentration is 0.2-0.3%. When preparing the solution, first dissolve the borax with a small amount of 45 ° C hot water, and then the water.
8. Grass ash: The commonly used spray concentration is 3-5%. After adding water with grass ash, the mixture was stirred, allowed to stand for 15 hours, and then filtered for reuse.
9. Rare earth: The spraying concentration for vegetables and food crops is 0.05%, and that of fruit trees is 0.08%.
10. Increasing bacteria: The spraying concentration of field crops is usually 15-30 ml, and spraying 40-50 kg of water. The fruit trees are sprayed with 80-100 ml of water and 100-150 kg of water.
Huaxian County Shang Hongyan
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