Early application of topdressing nitrogen fertilizer should not be too late in topdressing, and potassium fertilizer should be the mainstay in the middle and later stages. It can be divided into 2 to 3 applications. When the seedlings are grown, the topdressing is performed for the first time to promote early-onset growth and increase photosynthesis area. At this time nitrogen fertilizer accounted for 30% of the amount of nitrogen applied, and potassium accounted for 20% of the total potassium application.
The top-hatching potato needs more micronutrients such as calcium, magnesium, sulphur, boron and zinc. Therefore, in order to combine the local soil fertility status with the growth status of the potato, external root fertilization (generally referred to as foliar fertilization) should be performed in a timely manner. ) to increase potato resistance and yield. From the time when the potato seedlings start to leaf, the mixture of 0.1% magnesium sulfate, 0.3% potassium dihydrogen phosphate, and 1000 times triacontanol is applied once every 7 to 10 days, and the spray is sprayed 3 to 5 times, evenly. Wet leaf.
The combination of the two fertilizers outside the roots can prevent potato stems and leaves from affecting tuber enlargement and quality. When budding, the second topdressing is performed to promote the continuous growth of stems and leaves, increase the area of ​​photosynthesis, which is conducive to the enlargement of tubers, thereby promoting the high yield and stable production of potatoes.
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