In the middle and late stages of the potato

     At present, the arched potato enters the flowering and fruiting period. This period is a key period for potato field management. It is necessary to strengthen water and fertilizer management, timely carry out cultivating, soil cultivation, weeding, pay attention to prevention of prevention, timely prevention and control of various pests and diseases, and propose the following management measures for capturing high yield:

Fertilizer management

    The field with sufficient base fertilizer and strong plant growth can be sprayed with urea 3 per acre , potassium dihydrogen phosphate 4 , brown sugar 5 and 50 kg of water , or sprayed with Tianda 2116 plant growth nutrient solution ( plant cell membrane homeostasis) agent) to improve the resilience of potato and promote healthy plant growth and prevent premature aging. Plants thin, yellow leaves was significantly Tuofei plots, to timely fertilizer Mushi 10 kg of urea, potassium sulfate 10 kg, 20 to 25 kg phosphorus, local conditions, irrigation can be combined, for flushes, while Spraying Tianda 2116 plant growth nutrient solution.

Cultivating soil and weeding

    It is necessary to timely cultivate and cultivate soil, remove field weeds, avoid grass and potato competition, and thicken soil layer, enhance soil permeability, increase soil temperature, increase soil range of tuber growth, increase underground rhizome, and benefit tubers. Inflated, it plays an important role in increasing production. In addition, it is necessary to prevent the potato chips from being exposed, forming green potatoes and reducing the quality.

Prevent the length

    The potatoes are long, the plants are heavily crowded, the branches and leaves are shaded, and the underground potato blocks are enlarged and the high yield is adversely affected. Relevant measures should be taken to curb the length of the apprentice. The currently used inhibitors mainly include paclobutrazol and chlormequat. Potato squaring to flowering, paclobutrazol per acre with 15% wettable powder 50 to 80 grams of water, 30 to 50 kg, a solution of Chlormequat or foliar spray 1-6 milligrams per kilogram, spray interval of 7-10 days second, and even spray 2, has a significant inhibitory effect on the operation of the nutrients in the stems and leaves to the tubers have a good role in promoting, to prevent leggy plants, raise big potato rate, to increase production. In addition, timely removal of diseased branches, weak branches, enhance ventilation and light transmission, reduce disease. In the flower bud formation period, timely removal of flower buds and toppings to suppress the top advantage, avoid nutrient consumption, promote nutrient concentration supply of tubers, increase production.

    Prevention of late blight and aphids

    Late blight. The main symptoms are irregular brown spots on the front of the leaves and white hyphae around the lesions on the back of the leaves. The prevention and treatment methods are as follows: 1. The central disease plant is treated. When the central disease plant is found in the field, all the roots and potato pieces should be dug out, and the field should be buried deep ( more than 1 meter in depth ) . The diseased spots should be lime-disinfected and sprayed on the plants within 50 meters of the diseased plants. 58% of metalaxyl manganese zinc was controlled. 2. Daejeon chemical control. Each 58% metalaxyl mu MnZn WP 77--120 grams (active ingredient 45-70 g), 58% metalaxyl or MnZn powder 80-100 grams, or 72% bis-urea powder 75 MnZn Gram, spray 50 kg of water on the field. Depending on the incidence of the field, spray every 7-10 days. If it rains within 8 hours after spraying , it should be refilled in time.

    aphid. Aphids use plant sap, curl the leaves, consume a lot of nutrients, and destroy the photosynthesis of the leaves, but also spread the virus, which has a great impact on the production of potatoes. Control method: use 2.5% imidacloprid 40-60 ml / mu, or 4.5% beta-cypermethrin 5-27 g / mu, spray 30-50 kg of water , alternate use of chemicals, continuous control 2 - 3 times, can effectively control potato aphids The harm.

    The field management of the potato in the middle and late stages must be early action and early prevention.   
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