Compound fertilizer has obvious superiority compared with single fertilizer. However, you should pay attention to the following misunderstandings when choosing.
1. Use regardless of crop type. Different crops have different nutrient forms and proportions in compound fertilizers. However, it is more common to use blindly in the production regardless of the type of crop. For example, low-phosphorus compound fertilizer used in early rice, rapeseed and other crops can not meet the needs of these crops for phosphorus. Low-potassium compound fertilizer can not meet the needs of corn, late rice, sweet potato, flue-cured tobacco, sugar cane and so on. Crop needs. In particular, the compound fertilizer containing more chlorine is used in tobacco crops such as flue-cured tobacco, tea, watermelon, etc., causing the burning property of flue-cured tobacco to deteriorate, the watermelon to become salty and not sweet, and the death of new leaves of tea, which seriously degrades the quality of agricultural products. Therefore, it is necessary to select appropriate compound fertilizer varieties according to the characteristics of fertilizers required for different crops. Generally speaking, the fertilization of cereal crops should be based on increasing yield. The nutrient forms and ratios of compound fertilizers should be determined according to the soil nutrient abundance. The demand for nitrogen, phosphorus and potassium in economic crops is potassium > nitrogen > phosphorus. Potassium application in crops can not only increase yield, but more importantly, it can play an important role in improving quality. Like most cash crops, root crops (such as sweet potatoes), root crops (lianthus, polygonatum, etc.), corn, late rice, etc. should use compound fertilizer with higher potassium content; relatively speaking, early rice, peanuts, and sesame seeds. For rapeseed, pepper and other crops, it is necessary to pay attention to the selection of compound fertilizer with higher phosphorus content; for leafy vegetables, compound fertilizer with higher nitrogen content should be used. Water-based crops such as watermelon, strawberry, grape, citrus, flue-cured tobacco, and tea should be selected from sulfur-based compound fertilizers with low chlorine content. In view of the fixed proportion of compound fertilizers, it is necessary to use single fertilizer when using. The compound fertilizer is mainly used, and the single fertilizer is used for regulation and supplementation. Promote the use of special compound fertilizers, such as rice special fertilizer, citrus special fertilizer, watermelon special fertilizer.
2. Use regardless of soil type. For example, if the nitrate-containing compound fertilizer is used in paddy fields, it will be seriously lost due to leaching and denitrifying denitrification; the compound fertilizer containing strontium-soluble phosphate (such as calcium magnesium phosphate) will be poorly used in calcareous soil (alkaline). . In view of this, the nitrate-containing compound fertilizer should be used on dry land and not in paddy fields; the compound fertilizer containing chloride ion and ammonium ion should not be used on saline soil; the sulfate-containing compound fertilizer should not be on the paddy field. For use, calcium-magnesium-phosphorus fertilizer compound fertilizer should be used on acidic soil and neutral soil.
3. Improper application period and location. For example, the use of compound fertilizer in the late stage of crop growth and development causes gluttony and late maturity, fertilizer exposure to seeds causes fertilizer damage, etc.; compound fertilizer decomposition is slow, not easy to lose and volatilize, fertilizer effect lasts longer, should be mainly used as base fertilizer. In the later stage of crop growth, it is not advisable to use compound fertilizer. If fertilization is needed, the quick-acting fertilizer can be supplemented in time. When the compound fertilizer is used in a small amount, it can be used as a seed fertilizer, but the seed should be separated from the fertilizer; when the fertilizer is used in a large amount, the compound fertilizer can be used as a base fertilizer for deep application, and can be applied as a noodle fertilizer in rice fields.
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