1. Fertilization principle Most of the northern regions such as North China are solar greenhouses. Most of the central and southwestern regions are small and medium-sized arch sheds. The amount of nitrogen, phosphorus and potassium fertilizers used in production is high, the proportion of nutrient input is unreasonable, soil nitrogen, phosphorus and potassium nutrient accumulation is obvious, and excessive irrigation It leads to serious nutrient loss, widespread soil acidification, obstacles in the supply of elements such as calcium, magnesium and boron, and continuous crop failure, which leads to serious deterioration of soil quality, decreased nutrient absorption efficiency and decreased vegetable quality. The following fertilization principles are proposed:
(1) Rational application of organic fertilizer, adjustment of the amount of NPK fertilizer, non-calcium soil and acid soil need to supplement calcium, magnesium, boron and other trace elements;
(2) Rationally distribute chemical fertilizer according to crop yield, sorghum and soil fertility conditions, most of the phosphorus fertilizer application, nitrogen and potassium fertilizer application; it is not suitable for frequent topdressing in the early stage of growth, and pay attention to post-flowering and late-stage topdressing;
(3) Combined with drip fertigation technology, adopting the principle of “small number of times†to rationally fertilize fertilization;
(4) The old sheds with soil degradation need to be returned to the field or applied with high C/N ratio organic fertilizer, less manure manure, increased number of rotations, desalination and reduction of continuous cropping obstacles;
(5) When the vegetable acidification is serious, an acidic soil conditioner such as lime should be applied in an appropriate amount.
2. Fertilization advice
(1) The seedling fertilizer is added to the decomposed organic fertilizer and the phosphate fertilizer is applied. 60~100 kg of decomposed poultry manure per 10 m2 seedbed, 0.5~1 kg of calcium, magnesium and phosphate fertilizer, 0.5 kg of potassium sulfate, and sprayed 0.05%~0.1% urea solution 1~2 times according to the seedling condition;
(2) 4 yuan/mu of high-quality organic fertilizer applied to base fertilizer;
(3) The production level is 8000~10000 kg/mu, the nitrogen fertilizer (N) is 25~30 kg/mu, the phosphate fertilizer (P2O5) is 8~9 kg/mu, and the potassium fertilizer (K2O) is 45~50 kg/mu;
(4) The production level is 6000~8000 kg/mu, nitrogen fertilizer (N) 20~25 kg/mu, phosphate fertilizer (P2O5) 6~8 kg/mu, potash fertilizer (K2O) 35~45 kg/mu;
(5) The production level is 4000~6000 kg/mu, nitrogen fertilizer (N) 15~20 kg/mu, phosphate fertilizer (P2O5) 5~7 kg/mu, potash fertilizer (K2O) 25~35 kg/mu.
When the soil pH of the vegetable field is less than 6, the calcium, magnesium and boron are easily deficient. The base can be applied with lime (calcium fertilizer) 50~75 kg/mu, magnesium sulfate (magnesium fertilizer) 4~6 kg/mu, and the root is applied 2~ 3 times 0.1% boron fertilizer.
More than 70% of the phosphate fertilizer is used as the base fertilizer strip (point), and the rest is applied with compound fertilizer, 20%~30% nitrogen and potassium fertilizer base application, 70%~80% after the flowering to the ear expansion period, 4~8 times with water Shi, each time the application of nitrogen fertilizer (N) does not exceed 5 kg / mu. If drip fertigation technology is used, the amount of nitrogen (N) per application can be reduced to 3 kg/mu.
This article URL: 2016/2017 autumn and winter tomato science fertilization guidance advice tomato fertilization skills
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