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 those rich in nitrogen, should have no adverse effects on the environment and crops (nutrition, taste, quality and plant resistance). The types of fertilizers allowed are:
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 fermenting liquid for inoculating fungi, adding some humic acid, alginic acid, amino acid, vitamins, sugar and other fertilizers (including soil active agents and rhizobium) , a nitrogen-fixing bacteria, phosphorus bacteria, silicate cells and other complex microbial fertilizers).
4. Compound fertilizer: organic and inorganic compound fertilizer prepared by scientific formula with two or more kinds of fertilizers mentioned above. Note: The last application of fertilizer should be carried out 30 days before harvest.
This article URL: How to apply fertilizer and fertilizer to pollution-free agricultural products
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