After the potato seedlings emerge, they should immediately cultivate 1-2 times in order to promote seedlings and hair roots. In case of drought, a small amount of water should be poured. About 10 cm high when the seedlings, combined irrigation, topdressing urea 20-25 kg per mu, or fully decomposed human excrement 500-750 kg.

From the onset of buds, the shoots and leaves above the ground are basically ridged, and the underground stems enter into a rapid expansion period. It is necessary to combine 15 to 20 kg of urea, 15 kg of potassium chloride or potassium sulphate per acre.

One month before harvest, top dressing was performed with 0.1% potassium sulfate and 0.1%-0.2% potassium dihydrogen phosphate alternately 2-3 times. During tuber expansion, keep the soil moist and stop watering for a week before harvest.

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