Problems in fertilization and principles of fertilization
In light of the problems of light potassium fertilizers with diarrhea and phosphorus in the production of radish, the imbalance of nitrogen, phosphorus and potassium, the unreasonable application period of phosphorus and potassium fertilizers, the obvious shortage of organic fertilizers, and the insufficient attention to the application of trace elements, the following principles of fertilization were proposed: ) Optimize the use of nitrogen, phosphorus, and potassium according to soil fertility conditions and target yield, and pay special attention to the adjustment of N and P fertilizers and application of potash fertilizer; (2) The content of effective trace elements such as manganese, zinc, boron, and molybdenum in northern calcareous soil is low. Attention should be paid to the supplementation of trace elements; when the acidification of vegetable fields in the South is severe, lime soil and other acidic soil conditioners should be used; (3) Rational application of organic fertilizers can significantly increase radish yield and improve quality, avoid the use of organic fertilizers that are not adequately decomposed, and promote the use of commodities. Organic fertilizers and decomposed farmyard fertilizers.
Fertilizer amount and method
(1) The amount of organic fertilizer: The small radish (1000 1500 kg/mu) of small radish (such as radish of the four seasons) can be applied with organic fertilizer 0.5-1 square meter/mu; the production level of organic fertilizer is high in the range of 4500-5000 kg/mu. Fertilizer 2-3/mu. (2) The output level is above 4000 kg/mu: nitrogen fertilizer (N) 15-18 kg/mu, phosphate fertilizer (P2O5) 5-7 kg/mu, potassium fertilizer (K2O) 12-14 kg/mu. (3) Output level 2500-4000 kg/mu: Nitrogen fertilizer (N) 10-13 kg/mu, Phosphorus fertilizer (P2O5) 4-6 kg/mu, Potash fertilizer (K2O) 10-12 kg/mu. (4) Output level 1000-2500 kg/mu: nitrogen fertilizer (N) 6-9 kg/mu, phosphate fertilizer (P2O5) 3-5 kg/mu, potassium fertilizer (K2O) 8-10 kg/mu.
If basal fertilizer is not applied with organic fertilizer, it may be appropriate to increase nitrogen fertilizer (N) 3-5 kg/mu and potassium fertilizer (K
2O) 2-3 kg/mu. For plots prone to lack of boron micronutrients, or for plots that have exhibited symptoms of boron deficiency in previous years, one kilogram of borax can be applied per acre before sowing, or 0.1%-0.5% of borax can be used during late growth of radish or The boric acid aqueous solution is sprayed on the leaves (it can also be sprayed with pesticide), sprayed every 5-6 days, and sprayed 2-3 times.
All organic fertilizers were used as base fertilizer, 40% of the total nitrogen fertilizer was used as base fertilizer, 60% were used as top dressing in rosette stage and 2 times in the early stage of fleshy root growth; Phosphorus and potassium fertilizers were all used as base fertilizer, or 2/3 potash was used as base fertilizer, 1 / 3 in the early stage of growth of fleshy root topdressing.
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