A method of spraying a fertilizer solution to obtain a nutrient element through a leaf, which is called foliar fertilization, and a fertilizer for directly applying the nutrients required for the crop to the leaf surface for foliar absorption, which is called foliar fertilizer. In recent years, with the development of fertilization technology, foliar fertilization has been rapidly promoted and applied as a fertilizer for strengthening crops and preventing some diseases. Practice has proved that foliar fertilization is one of the fertilization techniques with rapid fertilizer efficiency, high fertilizer utilization rate and low dosage.
Foliar fertilization allows nutrients to enter the body directly from the leaves, participating in the metabolism of the crops and the synthesis of organic matter, and thus is more rapid and effective than soil fertilization. Therefore, it is often used as an effective measure to treat crop deficiency in a timely manner. In the case of fertilization, it is also possible to carry out staged spraying and replenishment according to the growth period of the crops and the actual condition of the seedlings and soil fertilization, so as to give full play to the characteristics of rapid foliar fertilizer response, so as to ensure the normal growth of the crop under suitable fertilizer and water conditions. Development, to achieve high-yield and high-quality purposes. However, only the correct application of foliar fertilization technology can fully exert the effect of increasing yield and increasing income of foliar fertilizer. Therefore, the issues to be aware of when using foliar fertilization are:
Choosing the appropriate spray concentration Foliar fertilization concentration is directly related to the effect of spraying. If the solution concentration is too high, it will easily burn the crop leaves after spraying; the solution concentration is too low, which not only increases the workload, but also does not reach the supplementary crop nutrition. Requirements. Therefore, in the application, it should be formulated according to the local conditions due to different fertilizers and crops.
Choose the appropriate spraying method. The solution should be evenly distributed. The spray mist should be evenly distributed.
Mastering the spraying period When foliar fertilization, it is necessary to select the nutrient elements according to the different growth stages of various crops, and select the most nutrient elements of the crops and spray them at the most urgent time to achieve the best results.
Choosing the appropriate spraying time The effect of foliar fertilization is directly related to temperature, humidity, wind, etc. For foliar application, it is best to choose no wind, cloudy or humid, and the evaporation is small at 9 am. In the past, it was most appropriate to carry out after 4 pm. If it rains 3-4 hours after spraying, it needs to be refilled.
Choosing the appropriate spraying site The upper, middle and lower leaves and stems of the plant differ greatly in their ability to absorb external nutrients due to their different metabolic energies. It is necessary to select an appropriate spraying site.
Adding auxiliaries When spraying fertilizer on the foliage, appropriate additives are added to improve the adhesion of the fertilizer to the leaves of the plants and promote the absorption of fertilizer.
Combined with soil fertilization, because the root has a larger and better absorption system than the leaf, for large amounts of nutrients such as nitrogen, phosphorus, potassium, etc., it is determined that more than 10 times of foliar fertilization can reach the total amount of nutrients absorbed by the roots. . Therefore, foliar fertilization cannot completely replace the root fertilization of crops and must be combined with root fertilization.
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