Plastic film potatoes are planted in large areas in the central and southern parts of Fujian Province such as Handan, Shijiazhuang and Baoding. At present, potatoes are about to enter tuber enlargement stage. This stage is sensitive to water and fertilizer, and the demand is large. It is also a stage of high insect pests. Below, introduce the technical aspects of late-stage management of mulching potatoes.
First, in addition to membrane soil. When the shoots and leaves of the potato's ground reach a height of about 30 cm, and before and after potato sprouting, when the tubers begin to swell, when the outside temperature stabilizes at 30°C, the covered plastic film must be promptly removed. After removing the mulching film, weeds should be removed from the ridges in time and soil should be cultivated twice at the potato roots. Potato production can be increased by cultivating soil to prevent the occurrence of potato tuber scab.
Second, water and fertilizer. Tuber enlargement of potatoes needs sufficient water and fertilizer supply. When tubers have the size of walnuts, they can be top-dressed with watering. Potatoes are hipotassium-based crops, and there is a large demand for potash fertilizer. When watering, Mu topped 20 kg of nitrogen and potassium fertilizers, and then top-dressed it once every 10 days, continuously topdressing twice. When encountering continuous dry weather, it is necessary to pay attention to watering in time to prevent soil drought from affecting tuber enlargement.
Third, control pests. When potatoes enter the late growth stage, the main insect pests are two pests, aphids and cockroaches. Locusts damage the leaves and suck the sap of potato leaves, and it is also very easy to spread potato virus disease, which obviously affects the yield of potatoes. Can use 800 times imidacloprid spray control, medication once every 7 days, continuous medication twice. Wolfberry is a common pest in potato production. It mainly bites potato tubers, causing a decrease in yield and a loss of commercial quality, which affects planting income. The prevention and control method is to use phoxim to irrigate the roots, and the dosage per acre is 1 to 1.5 kg. Watering and irrigating the roots before and after the evening can play a significant control effect.
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