Organic fertilizer and compound fertilizer can not replace potash
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From the perspective of the main crops, the potassium deficiency leaves of the rice are dark green to bronze, the heart leaves are straight, the leaves of the old leaves are soaked, the stems are easy to fall and break, the open rate is high, and the leaf spot and sheath blight are susceptible. . The tip and edge of the old potassium leaf of wheat are gradually browned, and the stem is slender and easy to fall. Young leaves of potassium deficiency in maize turn yellow, and the plants are small and easy to fall. Peanut deficiency potassium leaves light green, leaf edges are scorched, and fertility is inhibited. The potassium-deficient leaves of cotton have yellow-white plaques, brown spots on the tip and leaf margins, which are rolled down, the cotton bolls become smaller, and the bolls are not smooth. It can be seen that potash is crucial in agricultural production.
Now, some farmers have misunderstood the investment in potash fertilizer. First, they think that there is enough potassium fertilizer in organic fertilizer, and secondly, there is already potassium fertilizer in compound fertilizer, and there is no need to apply potassium. On the other hand, some farmers feel that the price of potash has soared too fast in recent years, and it is not worthwhile to invest more. Due to these misunderstandings, the rational investment in potash is hindered.
According to the existing scientific and technical data, in organic fertilizers, the content of potassium oxide in human excrement is 0.2%~0.3%, the content of potassium oxide in pig manure is 0.44%, and the content of potassium oxide in cow manure. For 0.15%, the potassium content of chicken manure is 0.9%, and the potassium content of duck manure is 0.6%. In crops and dried straw, the content of potassium oxide is generally about 1%, the highest corn stalk is 2.28%, and the lowest barley hull is 0. 28%. In the high-content compound fertilizer of chemical fertilizer, the content of potassium oxide is 15% to 16%, which is equivalent to potassium chloride or potassium sulfate of 12.5 to 13.45 kg.
From the point of view of the potassium demand of the field crops, generally 15 to 20 kilograms of potassium chloride or potassium sulfate should be applied per acre. For insect-resistant cotton, the amount of potassium needed is more, and the amount of potassium per acre cannot be less than 25 to 30 kilograms.
The analysis of the above data shows that although organic fertilizer plays an important role in improving soil properties and fertility, it has a limited potassium content. In the high-content compound fertilizer of chemical fertilizer, the ratio of potassium fertilizer is still at a certain distance from the potassium demand of crops. Therefore, in guiding agricultural production, it is necessary to timely supplement potassium fertilizer according to the potassium demand of different crops, and how much to make up. It is not possible to replace potash with organic fertilizer and compound fertilizer.
Huaxian Liu Huimin