The late growth period of sweet potato is a critical period for the expansion of tuberous roots (potatoes), and the weight gain accounts for 60% to 70% of the total weight. Therefore, if we want to increase the yield of sweet potato, we must strengthen the cultivation and management of the late growth period and extend the photosynthesis time of the leaves. The major measures are now described below.
One, topping, pruning and picking the top of the heart for a total of two times, the first time in the fries grow to 30 to 40 cm long, remove l ~ 2 cm long hair; the second time when the branches grow to 30 cm When left and right, remove the tender tips again. For the more prosperous potato field with branches, scissors can be used to cut off 2 or 3 branches, so that the nutrients can flow back, allowing the roots to get more nutrients, improve the light transmission, and speed up photosynthesis. However, poor soil should not be topping.
Second, the clever application of cracking fertilizer in September is sweet potato root swelling, cracks in the surface soil layer, irrigation cracking fertilizer can promote sweet potato root swelling. Fertilizers that can be used for grouting are: 1) 750-1,000 kilograms of composted manure per acre, and about 500 kilograms of clean water mixed at about 5 pm. 2 500 grams of potassium dihydrogen phosphate per acre, first dissolved in warm water, then mixed with 500 kilograms of water, water in the cracks. 3 2.5 kg of urea per mu, 10 kg of superphosphate, dissolved in a small amount of water, 500 kg of water to root. 4 Use 100 kg of ash per acre to dissolve in water. After soaking for 5 hours, remove impurities and 500 kg of water to root.
It is worth noting that no matter which method is used to irrigate the roots, the action should be slow, and immediately after the fluid is applied, the cracks should be sealed with fine topsoil. This will not only reduce the volatilization of the fertilizer, but also play the role of drought resistance and seedling protection. .
Third, foliar spray fertilizer to prevent early growth of sweet potato growth, the ability of the roots to absorb nutrients weakened and fertilizer inconvenience, then you can take extra-root fertilizer measures, can effectively prevent premature aging of leaves, enhance stamina, to achieve a good increase in production and income. Use 0.5% urea diluent, or 2% to 3% of superphosphate solution, or 5% of plant grey water, or 0.2% to 0.3% of potassium dihydrogen phosphate solution and 1% of urea. Spray 10 times a day, spray 2 or 3 times.
Fourth, reasonable drainage sweet potato root swelling period, such as more rain, should clear the field drains in time to reduce the waterlogging. If there is an autumn drought, it should be watered in time. However, watering should be stopped before the sweet potato is harvested for half a month to prevent the high water content of the potato block and affect the storage of the potato block.
Fifth, control of tigers, earthworms can be used to kill poison bait, with 80% trichlorfon wettable powder 60 to 100 grams, first with a small amount of water, and sauteed cottonseed cake or rapeseed cake 5 ~ 7 kg mix evenly. You can also use poisonous grass to seduce, take fresh grass 25 to 40 kilograms, smashed into 1.7 centimeters long, and 90% of trichlorfon 50 grams of water mixed evenly, in the evening sprinkled in the ground near the potato roots to kill.
6. The timely harvesting of sweet potato roots did not show significant maturity. When the average temperature dropped to 15°C, the roots stopped expanding and the excavation was timely. The latest should not be lower than 12°C. Too late will cause the roots to suffer cold damage, reduce the quality and storage capacity. If planting potatoes, they must be harvested 10 to 15 days before the frost.
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