Organic fertilizer and compound fertilizer cannot replace potassium fertilizer
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From the perspective of the main crops, the potassium-deficient leaves of the rice turned dark green to bronze, the leaves were straight, the leaves of the old leaves were coke-like, the stems were easy to fall off, and the emptying rate was high, and they were susceptible to leaf spot and sheath blight. . The potassium-deficit old leaves of the wheat are gradually yellowed and their stems are slender and easy to fall. The lack of potassium in young leaves of yellow maize plants is easy to pour. The potassium leaf color of Peanuts is light green, and the leaves are in the foreground and the fertility is inhibited. The potassium-deficit leaves of cotton have yellow-white patches, brown spots on the tip and leaf margins, and rolling down, the cotton bolls become smaller, and the bolling is not smooth. It can be seen that potassium fertilizer is very important in agricultural production.
Now, some farmers still misunderstand the use of potash fertilizer. One is that there are enough potassium fertilizers in organic fertilizers, and the other is that there are already potassium fertilizers in compound fertilizers and potassium can be dispensed with. On the other hand, some farmers think that the price of potash has soared too fast in recent years and it is not worth the investment. Due to these misunderstandings, the reasonable investment in potash fertilizer is hindered.
According to the existing scientific and technological data, in the organic fertilizer, the content of potassium oxide in human excreta is 0.2%~0.3%, the content of potassium oxide in pig manure is 0.44%, and the potassium oxide content of cow dung. At 0.15%, chicken manure has a potassium oxide content of 0.9% and duck manure has a potassium oxide content of 0.6%. The content of potassium oxide was generally about 1% in crop air-dried plants, the highest corn stalk was 2.28%, and the lowest barley husk was 0. 28%. In the high-content compound fertilizers for chemical fertilizers, the content of potassium oxide is 15% to 16%, equivalent to 12.5 to 13.45 kg of potassium chloride or potassium sulfate.
From the perspective of potassium requirements for crops grown in Daejeon, potassium chloride or potassium sulfate 15 to 20 kg should be applied per acre. For insect-resistant cotton, a greater amount of potassium is required, and no less than 25 to 30 kg per mu.
Comprehensive analysis of the above data shows that although organic fertilizers play an important role in improving the soil properties of farmland and fertility, the potash fertilizer content is limited. In the high-content compound fertilizer with chemical fertilizer, the ratio of potash fertilizer is still a certain distance from the potassium requirement of the crop. Therefore, in guiding agricultural production, according to the amount of potassium needed by different crops, it is necessary to add potassium fertilizer in a timely manner, and how much is to be compensated for, and organic fertilizer and compound fertilizer cannot be used instead of potash fertilizer.