At the end of May and early June, potatoes will gradually enter tuber enlargement period. At this stage, potatoes are more sensitive to water and fertilizer, and the demand is relatively large. It is also a period of high incidence of diseases and insect pests. Next, according to the investigation of the Qiangying and Daqi early spring mulching potato growth, the regional station staff put forward the following technical points for the late-stage mulching potato late-stage management.
In addition to membrane culture soil, when the stalks and leaves of potato mulching potatoes reached a height of about 30 cm in the early spring, the tubers began to swell before and after potato sprouting. When the outside temperature stabilized at around 25°C, the mulching film on the ground should 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. Earthing can increase potatoes yield and prevent the occurrence of potato tuber scab.
Watering and fertilizing potato tuber enlargement requires sufficient water and fertilizer supply. When the size of the tuber is walnut, it can be combined with water to top-dress. Potatoes are hi potassium-type crops, and there is a large demand for potash fertilizer. When watering, Mu topped 20 kg of nitrogen and potassium fertilizers, topdressed once every 10 days, and continuously top-dressed twice. When encountering continuous dry weather, it is necessary to pay attention to watering in time to prevent soil drought from affecting tuber enlargement.
Pest control Potatoes enter the late growth stage. The main insect pests are 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 10% imidacloprid 800 times spray control, medication once every 7 days, continuous medication twice. Cockroach is a major underground pest that affects potato production. It mainly bites potato tubers, causing a decrease in yield and a deterioration in the quality of goods, which affects the planting income. The prevention and control method is to use phoxim to irrigate the roots, and the dosage per hectare is 1-1.5 kg. In combination with watering and rooting before and after the evening, it can play a significant control effect, increase the output and commodity, and increase the planting efficiency.
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