Main technical measures after sweet potato cutting

Water and gas pooling. The suitable water holding capacity of sweet potato growing soil is 60%-70% in the early stage, 70%-80% in the middle stage, and 60% in the later stage. When the morning potato leaves are wilting due to drought, it is necessary to fill the "horse water" in a timely manner (can wet the ridges), and do the drainage and stain prevention work on rainy days. No irrigation for 15 days before harvesting.

High-yield group regulation. High-yield group regulation goals: early onset, early-term stable, late in the long-term and premature aging. Ways and means to achieve the goal: First, check the seedlings in time to ensure the seedlings. The second is the growth of the late-grown plots, taking control measures. The third is the late growth stage of sweet potato, the plot of poor growth, should be based on the situation of seedlings to apply quick-acting nitrogen fertilizer to prevent premature aging; leaf color is light, 1.5 kg of imported urea plus 0.2 kg of potassium dihydrogen phosphate to 60 kg of water, on sunny days Foliar spray after 4 pm, spray again every other week.

Comprehensive prevention and control of pests and diseases. The prevention and control of sweet potato pests and diseases should adhere to the principle of agricultural control and supplemented by chemical control. We will comprehensively implement agricultural control measures such as “selecting disease-resistant and insect-resistant varieties, scientifically managing water, and rationally fertilizing”. The prevention and control strategy should adhere to the principle of “prevention first, comprehensive prevention”. On the basis of making predictions and predictions, according to the situation of seedlings, weather, pests and diseases, scientific and high-efficiency, low-toxicity and low-residue agents should be selected in a timely and scientific way to prevent and control, improve the control effect, minimize the residue and reduce environmental pollution.

In recent years, the main pests and diseases of sweet potato have been characterized by heavy insect pests and light disease. Mainly: Spodoptera litura, small weevil and so on. Controlling Spodoptera litura can use Awei salt or virus polyhedral pesticides, and the control effect is better; control of small weevil can use 10% chlorpyrifos granules 2 kg or 3% phoxim granules 3 kg in sweet potato expansion crack Or when the potato is exposed, the sweet potato base is spread around the stem of the sweet potato.

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