When the potato grows into the flowering and potato period, it is the most critical period of field management. In order to ensure high potato yield, the following points must be grasped:
1. Timely soil cultivation: At present, there is a widespread phenomenon of thin soil and narrow ridges, which can easily produce sweet potatoes and affect the commercial nature. They must be combined with cultivator and large earths once, with a thickness of 2 to 3 cm to cover the entire mulch to prevent the phenomenon of sweet potato.
2. Apply fertilizer at the root: For the weak growing potato plants, the yellow-leaved plots should be sprayed with foliar fertilizer in time, and 0.3% urea or potassium dihydrogen phosphate spray can also be used. The concentration should not be too large to avoid burned plant leaves.
3. Control of leggy: After field investigation, individual plots have a phenomenon of leggy and the plants are particularly prosperous. It is timely to spray “paclobutrazol†to regulate and promote the conversion from vegetative growth to reproductive growth. The buds that appear are removed in time to avoid consumption of nutrients.
4. Water management: Keep the soil moist from the seedling stage to the budding stage to facilitate the vegetative growth of the plant. Generally, when the seedlings are in seedling stage, water can be poured once, especially during budding period, flowering period, and potato harvesting period. Water is poured in each of the three periods depending on weather conditions. One is to increase bran, and the other is to reduce temperature, in order to facilitate the formation of tubers, expansion, water should be poured along furrows, it is best not to diffuse over the ridge roof to prevent soil surface hardening, stop watering 7 days before harvest.
5. Pest control (1) Disease. The most serious ones are the early and late blights. Found that the central diseased plant was sprayed with 25% Rhizoctonia WP 800 times solution or 72.2% pomegranate 650-800 times solution or 72% DuPont Kelu 700-800 times solution or 25% Rhizoctonillus WP 1000 times liquid, once a week, 2 or 3 times can control the disease development. (2) Insect pests. The pests that injure potatoes mainly include 28 ladybugs and aphids. Prevention of 28 ladybugs can be used in the early larval eggs hatching with 20% deltamethrin EC 1000 ~ 1500 times liquid, spray every 6 to 8 days, even spray 2 or 3 times; locusts can use 5% Acetyl Emulsifiable concentrates are 1000-1500 times liquid or 5% imidacloprid 1000-1500 times, sprayed once every 7 days, and sprayed 2 or 3 times.
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