What fertilizers are available for the production of pollution-free agricultural products?

In the production process of pollution-free agricultural products, it is necessary to optimize the formula fertilization technology, mainly organic fertilizer, to maintain or increase fertility and soil biological activity. All fertilizers, especially nitrogen-rich fertilizers, should not have adverse consequences for the environment and crops (nutrition, taste, quality and plant resistance).
Types of fertilizer allowed:
1. Organic fertilizer: compost, manure, manure, biogas fertilizer, green manure, crop straw, cake fertilizer.
2. Inorganic fertilizer: mineral nitrogen fertilizer, mineral potassium fertilizer and mineral phosphate fertilizer (phosphorus ore), limestone; nitrogen fertilizer (including ammonium bicarbonate, ammonium sulfate) and phosphate fertilizer (including phosphoric acid) prepared according to the optimized formula fertilization technical scheme guided by soil fertilizer and agricultural technology department Diammonium, monoammonium phosphate, superphosphate, calcium magnesium phosphate fertilizer, potassium fertilizer and other inorganic compound fertilizers that meet the requirements.
Trace element fertilizer: a fertilizer formulated mainly from trace elements such as copper, zinc, iron, manganese, boron, molybdenum and beneficial elements.
Medium-quantity element fertilizer: a fertilizer mainly composed of medium elements such as calcium, magnesium, sulfur and silicon.
3, microbial fertilizer: plant growth auxiliary fertilizer, using natural organic extract or inoculating beneficial bacteria fermentation broth, adding some humic acid, alginic acid, amino acids, vitamins, sugar and other fertilizers (including active four-dimensional fertilizer, soil activity And microbial fertilizers such as rhizobium, nitrogen-fixing bacteria, phosphorus bacteria, and silicate bacteria).
4. Compound fertilizer: organic and inorganic compound fertilizer prepared according to scientific formula by using two or more of the above fertilizers.

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