Fertilization applied to the base fertilizer potato is mainly based on base fertilizer, which generally accounts for 70% to 80% of the total fertilization amount. The base fertilizer is often applied in combination with organic fertilizer and chemical fertilizer, and is applied in combination with soil preparation or soil covering. The base fertilizer is based on the application of 2500-3000 kg of high-quality organic fertilizer per acre, and the 60-80 kg of Schulsi series compound fertilizer.
When the application of the fertilizer is insufficient, or when the cultivated land is too late to fertilize, it is often used as a seed fertilizer when planting a special compound fertilizer of 15-20 kg. The application of seed fertilizer is mainly carried out by means of ditch application or acupoint application, but the fertilizer should not be in direct contact with the seed potato to avoid burning the seed potato.
Early application of topdressing nitrogen fertilizer should not be too late in topdressing, especially in the later stage, to avoid stems and leaves and affect tuber swelling and quality. In the middle and late period, potassium fertilizer is the main application. It can be divided into 2 to 3 applications. When the seedlings are used, the first top dressing is carried out to promote early growth and increase the photosynthesis area. At this time, nitrogen fertilizer accounts for 30% of the nitrogen application rate, and potassium fertilizer accounts for 20% of the total potassium application rate. At the time of the bud, the second top dressing is carried out to promote the continuous growth of the stems and leaves, and increase the area of ​​photosynthesis, which is conducive to the expansion of the tuber.
Appropriate root-external topdressing potatoes have a relatively large demand for micronutrients such as calcium, magnesium, sulfur, boron, zinc, etc. Therefore, it is necessary to combine external soil fertility conditions and potato growth conditions, and timely external fertilization (generally referred to as foliar surface) Fertilization) to increase potato resistance and yield. From the time when the potato seedlings began to spread, every 7 to 10 days, the leaves were topped with 0.1% magnesium sulfate, 0.3% potassium dihydrogen phosphate, 1000 times triacontanol mixture, sprayed 3 to 5 times, evenly sprayed. Wet blades.
Supplementing the period of rapid expansion of the underground tuber of magnesium fertilizer potato, 50-60 grams of magnesium sulfate per plant, drenched with clear water or decomposed manure, or digging shallow ditch around the plant to promote rapid expansion of underground tubers.
Avoid applying chlorinated potato to avoid chlorine crops. Do not apply potassium chloride or compound fertilizer containing chloride ions. Rational fertilization is a prerequisite for high yield and stable yield of potato.
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