Improve the structure of winter-sowing potato fertilizer

Understand the characteristics of potato growth and fertilizer requirements. Potatoes are not tolerant to high temperatures and are resistant to high temperatures. They germinate at 4°C, but they stop growing when the soil temperature reaches 30°C, making it difficult to form potato stalks. Fertility and nutrient uptake are faster. The ratio of NPK needs to be 2.2:1. : 4.6; The total demand for fertilizers is relatively large, the demand for nutrient elements is comprehensive, and it is sensitive to the lack of nutrients. Therefore, fertilization should be based on nutrient-rich organic fertilizers supplemented by chemical fertilizers; apply basic fertilizers, apply topdressing as early as possible, and apply more potassium fertilizer.

The scientific formula applies basal fertilizer. It has been determined that for every 500 kg of potato produced, 1.75-3 kg of nitrogen, 0.9-1.5 kg of phosphorus pentoxide and 4-6 kg of potassium oxide should be absorbed from the soil. High-yield potato must adhere to the formula balanced fertilization, basal fertilizer accounted for about 70% of total fertilizer requirements. It is recommended that basal manure Mushi 250,000 kilograms of farmyard fertilizer, should not use unfamiliar chicken and duck dung and pig manure, and apply 15 to 20 kg of urea, 25 to 40 kg of phosphate fertilizer, 20 to 25 kg of potassium sulfate, or application of the corresponding content of the composite fat. Farmers who have not accumulated farmland fertilizers can apply 50-60 kg of sulfur-containing compound fertilizer to Mushi and 150-200 kg of commodity organic fertilizer. After the emergence of seed potatoes, fertilizer should be applied as soon as possible, depending on the situation of seedlings chase 2 or 3 times. In the flowering period, 0.2% Sonic Boron solution can be sprayed out of the root, and then 1% potassium sulfate and 0.2%-0.3% potassium dihydrogen phosphate solution can be sprayed later.

To deal with the lack of disease prevention. In the process of potato production, if it is improperly applied, it will cause physiological diseases. For example, if nitrogen is insufficient, fertility will be slow, leaf color will fade after being faded first, and the lower leaves will wither, the leaf area will be stretched, the tubers will be small, and the yield will be low. Excessive nitrogen can lead to leggy plants, weak stem base, and susceptibility to disease or lodging. Such as lack of phosphorus, thin plants, slightly curled leaves, reduced carbohydrate tubers, hollow easily occur, potato block rust spots, difficult to cook. If the potassium is insufficient, the stems of the plants are dwarfed by clusters, some are bent, the internodes are short, and the leaves are dark green and coppery. Some leaf margins are scorched and the veins are subsidence. The potato shape changes into a spindle shape. black. In the absence of boron, potato chips degenerate and have a cracked pattern. Therefore, according to different soil quality and fertility, the missing elements should be supplemented early to prevent diseases.

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