Potato fertilizer requirement and formula fertilization technology

September 09 10:13:01, 2020

The characteristics of potato fertilizer need: the amount of fertilizer in the seedling stage is small, the amount of fertilizer in the flowering stage increases rapidly, reaching the peak in the early stage of potato production, and the amount of fertilizer is drastically decreased. The three factors of nitrogen, phosphorus and potassium were absorbed in each growth period, and the percentage of total absorption was calculated as 6% to nitrous, 8% to phosphorus and 9% to potassium in the emergence period; the growth period was 38%, 34% and 36% respectively; The potato period is 56%, 58%, and 55%. Among the three factors, potato has the highest absorption of potassium, followed by nitrogen and phosphorus. Tests show that for every 1000 kg of tubers produced, nitrogen (N) 5-6 kg, phosphorus (P2O5) 1-3 kg, potassium (K2O) 12-13 kg, nitrogen: phosphorus: potassium ratio of 2.5:1:5.3 The requirement of NPK for potato increased with the increase of stems and tubers. The amount of fertilizer needed in the period of tuber formation was about 60% of the total fertilizer requirement, and the total fertilizer requirement was 20% in the initial and final stages of growth.

Potato fertilization technology: Potato fertilization technology should follow the principle of farmyard manure, supplemented by chemical fertilizer, base fertilizer and proper topdressing.

1. Reapply the base fertilizer. The application method of the base fertilizer is that it is applied in a planting ditch and a hole, and is about 15 cm deep. The specific fertilization amount is about 1500 kg per mu, and the organic fertilizer is 1500-2500 kg, the urea is 20 kg, the calcium is 20-30 kg, the potassium fertilizer is 10-20 kg, and the fertilizer is applied to the seed potato 2-3 cm.

2, early topdressing. In the seedling stage, it is necessary to apply nitrogen fertilizer, combined with cultivating and cultivating soil, and chasing urea 5-8 kg, which is conducive to seedling protection. After the flowering of the potato, it is generally not necessary to carry out the rhizosphere topdressing. The main application is to apply the phosphorus and potassium fertilizer on the page. Spray 50-kg of 0.3-0.5% potassium dihydrogen phosphate solution on the acre page, spray once every 10-15 days, and spray 2-3 times.
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