How can organic fertilizer be applied efficiently and reasonably?
Traditional agriculture holds that vegetables should be given large amounts of organic fertilizer, and some vegetable growers even believe that the more organic fertilizer, the better. However, in recent years, the results of many experiments in various places show that appropriately increasing the application of organic fertilizer can effectively control the nitrate content of vegetables, while blindly increasing the application of organic fertilizer will cause the nitrate content of vegetables to exceed the standard. Vegetable nitrate...
Applying organic fertilizer plays an important role in improving crop yield and quality. However, with the progress of science and technology and the continuous improvement of soil fertility levels, it has been found in production that excessive application of organic fertilizer has produced many adverse consequences, not only causing increased accumulation of soil salinity, but also bringing adverse effects on soil bulk density, organic matter, aggregates and microorganisms, which is unfavorable to the normal growth of crops. In order to apply organic fertilizer efficiently and reasonably, experts remind us to pay attention to the following three points:First, choose high-quality organic fertilizer. At present, more and more commercial organic fertilizer is being applied, but the quality of commercial organic fertilizer is generally low, and some is even mixed with municipal sludge, domestic waste, etc., which simply does not reach the standard for organic matter content. Even some purchased chicken manure is mixed with soil. Therefore, in production, high-quality, pollution-free organic fertilizer must be accumulated and selected, and fully decomposed. If commercial organic fertilizer needs to be purchased, it should be produced by a regular large manufacturer.
Second, strictly control the amount of fertilizer applied. Under normal circumstances, the control amount per mu per season for vegetable land is 1500-2000 kg of pure chicken manure or 50-100 kg of high-quality cake fertilizer, or 3500-4000 kg of fully decomposed high-quality human and livestock manure or farmyard manure. Fruit-type and tuber-type vegetable crops have a relatively large fertilizer requirement, so the upper limit can be used; while leafy vegetable crops have a relatively small fertilizer requirement, so the lower limit can be used.
Third, apply it together with biological fertilizer. The biological bacteria in biological fertilizer can accelerate the decomposition of organic matter in organic fertilizer, making it more conducive to crop absorption, and at the same time can decompose and transform some harmful substances in organic fertilizer to avoid harm to crops. Generally, when applying organic fertilizer as a base fertilizer, 150-200 kg of biological fertilizer can be applied per mu; when applying it as a topdressing, 20-25 kg of biological fertilizer can be applied per mu each time.