There is an old saying in the countryside that “the crop is a flower, and the whole is dependent on the fat.†Fertilization is an important step in the growth of crops. However, experienced growers are adding urea to the leaves of the crops when they apply iron, zinc and boron fertilizers. Why? The following Hui Nong network Xiaobian compiled a lecture by Hunan Hongda Plant Protection College visiting professor Duan Hongtao on this fertilization technique, let's learn together!
When we find that the crop lacks trace elements such as iron, zinc and boron, it will spray iron, zinc and boron-containing fertilizer through the foliar surface. This should be a very quick way to supplement, low cost, low cost and effective. fast.
Supplemental iron fertilizer is generally based on cheap ferrous sulfate; supplemented zinc fertilizer is generally based on very economic zinc sulfate; supplemented with boron fertilizer, earlier with borax decahydrate (about 10% boron), but water solubility is not good, need Dissolved in hot water. Some people also use industrial boric acid (about 17% boron), the effect of boron supplement is very good, but the water solubility is not very good. Later, mainstream enterprises in the market are promoting sodium octahydrate tetrahydrate (more than 20% boron). The sodium octahydrate is really good. It not only contains high boron, but also dissolves in cold water. It is very convenient to use. good.
When we supplement these single trace element fertilizers separately, it can be directly sprayed with water, and the effect is also good. Today, the fertilizer Xiangjun introduces a little experience, and adds some urea to the trace element liquid fertilizer sprayed on these foliages. The absorption is faster and the effect will be more prominent!
It is well known that urea is suitable for all crops and all soils, and can be used as base fertilizer and top dressing, but should be applied in depth. Because urea contains more or less biuret, it is easy to cause burning and burning, so it can not be used as a seed fertilizer.
Why do you add more urea to iron supplementation, zinc supplementation, and boron supplementation? Let us look at the reason why urea is most suitable as a top dressing (foliar spray):
1. Urea is a neutral organic substance with small ionization, which can be regarded as non-electrolyte, which is not easy to cause separation of the wall and has little damage to the stems and leaves of the crop;
2. The volume of urea molecules is very small, only 3-4 times that of water molecules, and its permeability coefficient is close to that of water molecules, so it is particularly easy to penetrate cell membranes;
3. The urea molecule has good hygroscopicity, which can keep the leaf surface moist for a long time and increase the absorption amount;
4. After urea enters the leaf cells quickly, it can easily participate in the metabolism of the substance, and the fertilizer effect is particularly fast. The fertilizer effect can be produced 30 minutes after the spraying of the leaves.
Remarks: The nitrogen source in the general water foliar fertilizer is basically urea, so when spraying such foliar fertilizer, it is not necessary to add urea.
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