When using compound fertilizer, pay attention to go out of the wrong area

Compound fertilizer has obvious superiority compared to single fertilizer. However, when choosing, please pay attention to the following mistakes.

1, regardless of the type of crop used. Different crops have different requirements for the form and proportion of nutrients in compound fertilizers. However, it is more common to use blindly in the production regardless of crop type. For example, low-phosphorus fertilizers for early rice and rapeseed could not meet the needs of these crops for phosphorus, while low-potassium fertilizers could not meet the high potassium requirements for corn, late rice, sweet potato, flue-cured tobacco and sugarcane. Crop needs. In particular, compound fertilizers containing a relatively large amount of chlorine are used on tobacco crops such as flue-cured tobacco, tea leaves, and watermelons, causing deterioration of the flammability of the flue-cured tobacco, unsatisfactory saltiness of the flue-cured tobacco, and death of new leaves of the tea, thereby seriously reducing the quality of the agricultural product. Therefore, according to the characteristics of different crops need fertilizer to select the appropriate compound fertilizer varieties. In general, cereal crops fertilization should be mainly based on increasing yield, and the nutrient form and ratio in the compound fertilizer should be determined based on the nutrient abundance of soil. The demand for nitrogen, phosphorus and potassium in economic crops is more than potassium> nitrogen> phosphorus, and economic. Applying potassium fertilizer to crops can not only increase yield, but more importantly, it plays an important role in improving quality. As with most economic crops, tuber root crops (such as sweet potatoes), root crops (lotus medica, polygonatum odoratum, etc.), corn, and late rice, etc. should preferably use compound fertilizers with relatively high potassium content; in contrast, early rice, peanuts, and sesame , rape, pepper and other crops should pay attention to the use of high phosphorus compound fertilizer; leaf vegetables should use a higher nitrogen compound fertilizer. The sulfur-based compound fertilizer with low chlorine content should be used for the chlorine-free crops such as watermelon, strawberry, grape, citrus, flue-cured tobacco and tea. In view of the fixed fertilizer nutrient ratio, it should be used in conjunction with single fertilizer. Mainly compound fertilizer, single fertilizer to regulate and supplement. Promote the use of special compound fertilizers, such as special rice fertilizer, citrus fertilizer, watermelon special fertilizer.

2, regardless of the type of soil used. If nitrate-containing compound fertilizers are used in paddy fields, they will be seriously lost due to leaching and denitrification and denitrification; compound fertilizers containing barium-soluble phosphates (such as calcium, magnesium, phosphate fertilizers) will have poor fertilizer efficiency when used in calcareous soils (alkaline). . In view of this, nitrate-containing compound fertilizers should be used on dry land, and should not be used in paddy fields; compound fertilizers containing chloride ions and ammonium ions should not be used on saline-alkali soils; sulfate-containing compound fertilizers should not be used on paddy fields. The use of calcium magnesium phosphate compound fertilizer should be used in acidic soils and neutral soils.

3. Improper application period and location. For example, the use of compound fertilizer in the later growth period of crops causes late-maturing lust, and fertilizers contact seeds to cause fertilizer damage. Compound fertilizers decompose slowly and are not easy to lose and evaporate. Fertilizers last longer, and they should be used primarily as base fertilizers. It is not advisable to use compound fertilizer at the later stage of crop growth. If fertilization is required, quick-effect fertilizer can be added in time. When the compound fertilizer is used in a small amount, it can be used as a seed fertilizer, but the seeds and the fertilizer are separated. When the fertilizer is used in a large amount, the base fertilizer can be used as a deep layer in the whole plough layer, and can be used as a surface fertilizer in the paddy field.

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