Foliar fertilizer application techniques
1, choose the appropriate variety. In the initial stage of crop growth, in order to promote its growth and development, it is necessary to select the regulation of foliar fertilizer, if the crop lack of nutrients or root growth in the late growth period, the nutrient type foliar fertilizer should be used. Fertilizer varieties commonly used for foliar spraying on production include urea, potassium dihydrogen phosphate, calcium superphosphate, potassium sulfate and various trace element fertilizers.
2, spray concentration should be appropriate. In a certain concentration range, the speed and amount of nutrient entering the leaves increase with the increase of the solution concentration, but the concentration is too high and it is easy to produce fertilizer damage, especially trace element fertilizers, generally large and medium-sized elements (NPK, Ca, Mg and S) The use of the concentration of 500 to 600 times, trace elements iron, manganese, zinc 500 to 1000 times, boron 3000 times, copper, molybdenum 6000 times.
3, spraying time should be appropriate. When the leaves are fertilized, the longer the moistening time, the more nutrients the leaves absorb and the better the effect. Under normal circumstances, it is appropriate to keep the leaf wet time at 30-60 minutes. Therefore, it is better to conduct fertilization in the windless weather in the evening. Spraying fertilizer in the morning with dew will reduce the concentration of the solution and affect the effect of fertilization. No foliar dressing can be done before rain or rain, because the nutrients are easily lost and cannot achieve the desired effect. If the rain falls 3 hours after spraying, it should be sprayed once when the weather is fine, but the concentration should be reduced properly.
4, spraying should be uniform, meticulous, and thoughtful. Foliar fertilization requires small droplets and even spraying, with particular attention to spraying on the back of the vigorously growing upper leaves and leaves.
5, spraying frequency should not be too small, there should be intervals. The concentration of top-dressing crops is generally low, and the amount of uptake per time is very small, which is much lower than the demand for crops. Therefore, the frequency of foliar application should generally not be less than 2 to 3 times. At the same time, the interval should be at least one week or more, and the number of sprayings should not be too much to prevent harm.
6, foliar fertilizer should be properly mixed. When the foliage is topdressing, a reasonable mix of two or more types of foliar fertilizer can save spraying time and labor, and its yield increase effect will be more significant. However, after the fertilizers are mixed, they must have no adverse reactions or do not reduce the fertilizer efficiency, otherwise they cannot achieve the purpose of mixing. In addition, when the fertilizer is mixed, it is necessary to pay attention to the concentration and pH of the solution. Under normal circumstances, the pH of the solution is about 7 and neutral conditions are favorable for absorption in the leaves.
7. Add humectants to the fertilizer solution. There is a layer of thick and thin cuticles on the leaves of the crop, and the solution is difficult to penetrate. For this reason, an appropriate amount of wetting agent such as neutral soap, good quality detergent, etc. can be added to the leaf fertilizer solution to reduce the solution. The surface tension increases the contact area with the blade and improves the effect of foliar dressing.
8, the need to use the period of foliar fertilizer: 1, when encountering pests and diseases, the use of foliar fertilizer is conducive to improving plant disease resistance; 2, soil acidity, partial alkali or salinity is too high, is not conducive to plant absorption of nutrients; 3, full fruit period; 4, after the plant suffered gas, heat or frost damage, choose the right time to use leaf fertilizer is conducive to relief of symptoms.
9, it is best not to use the period of leaf fertilizer: First, the flowering period. Delicate flowers, susceptible to fertilizer damage; Second, the seedling period; Third, high temperature and strong light period.
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