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Appropriate application of seed fertilizers When the base fertilizer is insufficient or the cultivated land is too late to fertilize, often 15 to 20 kilograms of special compound fertilizer is applied as seed fertilizer when planting. 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 method. Can be divided into 2 to 3 applications, the first time after the seedlings to topdress, promote early hair, increase the area of â€‹â€‹photosynthesis. 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 â€‹â€‹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 Magnesium Fertilizer When the underground tubers of the potato are rapidly expanding, 50 to 60 grams of magnesium sulfate per plant is applied, and the water or the decomposed manure is applied to the plants, or shallow ditch is applied around the plants to promote the rapid expansion of the underground tubers.
Avoid applying chlorine fertilizer. Potato is a chlorine-free crop. 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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