Different fertilizers have different characteristics. Even chemical fertilizers with poor physical and chemical properties, a reasonable mix of chemical fertilizers based on the characteristics of fertilizer absorption and soil properties of the crops can not only fully exert their fertilizer efficiency, but also reduce production costs and achieve high yields.
First, the response of different crops to chemical fertilizers Different corn, wheat and other cereals with ammonium nitrogen fertilizer (such as ammonium bicarbonate, ammonium sulfate, ammonium chloride, urea) or nitrate nitrogen fertilizer (such as ammonium nitrate) is also effective. Potato and sweet potato are also suitable for ammonium nitrogen fertilizer. Ammonium nitrate can improve the quality of tobacco, and ammonium nitrogen can help the flammability of tobacco. Chlorine-containing fertilizers (such as ammonium chloride), however, reduce the flammability of tobacco and should be avoided. In addition, different crops have different requirements for nitrogen. Leafy crops such as leafy vegetables and tea leaves require more nitrogen fertilizer for crops to be harvested. Legume crops only need to apply a small amount of nitrogen fertilizer when the root nodule has not functioned in the early stages of childbirth. In the saline-alkaline soil areas, it is not appropriate to purchase ammonium chloride containing more chloride ions in order to avoid increasing soil salinity. In alkaline soils, ammonium nitrate fertilizers are absorbed and utilized by crops, but attention should be paid to prevent ammonium nitrogen from decomposing and evaporating.
Second, different crops respond to phosphorus Different leguminous crops (soybeans, peanuts), sugar crops (beet, sugar cane), fiber crops (cotton), potato crops (potato, sweet potato) and melons, fruit trees need more phosphorus Increased phosphate fertilizer has a good fertilizer effect. General calcium phosphate and heavy superphosphate are water-soluble phosphate fertilizers, which are easily absorbed and utilized by crops. "Heavy calcium" has a higher content of available phosphorus, which is 2 to 3 times that of "precursor calcium". The amount of heavy calcium can be reduced by referring to the amount of "precursor calcium". The seasonal crops can only absorb a small part of the phosphate fertilizers. Most of them are left in the soil, and they can also show a yield increase effect on the lower crops. Therefore, it is not necessary to apply phosphate fertilizers in successive years in plots where there is a large amount of phosphorus, so as to avoid waste.
Third, different crops respond to potash fertilizer. Wherever there are more carbohydrates in the crops, such as tobacco, potatoes, sweet potatoes, sugar beet, watermelon, fruit trees, etc. require large amounts of potassium, it is said that the potassium plant. However, these potassium-promoting crops are free from chlorine. If potassium chloride is applied to these crops, chloride ions will inevitably lead to a drop in yield and quality. Potassium chloride is also not suitable for long-term application on saline-alkali land. Base fertilizers and topdressing can be used on non-chlorinated crops, but it is not suitable for seed fertilizers. Potassium sulfate is suitable for all kinds of soil and crops and can be used as base fertilizer, seed fertilizer, topdressing fertilizer and top dressing fertilizer.
IV. Different crops respond differently to sulfur, sodium and chlorine
Horsebells, soybeans, peanuts, and oilseeds are also sulfur-loving crops. The use of "prepared calcium" is better than "heavy calcium." Because "heavy calcium" does not contain calcium sulfate. Sweet Lai is a hi sodium crop, and sodium nitrate is a good fertilizer for sweet Lai. Ammonium chloride contains up to 61% chlorine, and the chlorine crop is prohibited. But it is suitable for cotton, hemp and other crops, because chlorine can increase the fiber's toughness and pulling force.
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