Jiangmen Duramp Electric Co., Ltd , https://www.durampled.com
External fertilization is a commonly used fertilization method, which is to dissolve chemical fertilizers such as nitrogen, phosphorus and potassium, trace element fertilizers and human excrement in water, spray on the surface of crop leaves, so that crops can be absorbed and utilized, so it is also called leaves. Face fertilization. There are many benefits of fertilization outside the roots. The main manifestations are: fast fertilizer: the fertilizer is dissolved in water and sprayed onto the leaves of the crop. It can enter the flesh in more than 10 minutes, and the fertilizer can be used in a few hours. For example, when the lettuce leaves are sprayed with urea solution, the leaves turn from yellow to green after 3 days, and the roots are topdressed for 7 days. High fertilizer efficiency: general root topdressing, the utilization rate of fertilizer in the season is only 25% to 70%, while foliar application is as high as 90%. Less dosage: fertilization outside the roots, such as urea, the amount of 667 square meters is not more than 1 to 1.5 kg , and the amount of root dressing is several times more difficult, and it is difficult to apply evenly. The method is simple: the external fertilization only needs to dissolve the fertilizer in the water, and can also be combined with the prevention and control of pests and diseases and chemical agents, and it is more than one. The top dressing is more troublesome, and it will cause mechanical damage to the crop due to inadvertent operation. The effect of increasing yield is obvious: if 0.05 % ammonium molybdate solution is sprayed in the peanut phase , the yield can be increased by more than 15%; spraying potassium dihydrogen phosphate or superphosphate in corn flowering and filling stage can promote grouting, increase grain weight and increase yield 5 % to 7%. It is important to note that although the effect of fertilization outside the roots is good, the amount of fertilization is limited, and the fertility of the leaves is not as good as that of the roots. Therefore, it cannot replace the root topdressing in the early stage of crop growth, but can only be used as an emergency or remedy. Supplementary use.
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