Key techniques of Rice Straw mulching cultivation of Autumn Potato (part two)

4. Timely early sowing potato prefers cool climate, and the sowing time is suitable for daily average temperature to drop below 25 ℃. In the hilly area of Pingba below 500 meters above sea level, the suitable sowing time is from late August to early September, and in the low mountain area of 500 meters above sea level, the suitable sowing time is in late August.

5. reasonable close planting, applying sufficient bottom fertilizer to intercropping fields with potato and rape, and planting potato and rape in wide and narrow rows. The wide row of potato is 0.6m, the narrow row is 0.2m, the distance between nests is 0.22m, and the potato is sown with about 7000 nests per mu. In the middle of October, two rows of rape were planted in a no-tillage pry nest in the middle of each row of potatoes. The dense fertilizer experiments of different varieties showed that the sowing density of potato planted with rice stubble should reach 1-11000 nests per mu, row spacing 0.33m and litter spacing 0.16m-0.18m. When sowing potatoes, there is no need to dig nests, just press the seed potatoes on the topsoil by hand according to the prescribed row spacing, so that the seed potatoes are in close contact with the soil. The growth period of autumn potato is short, and it is difficult to top fertilizer after covering rice straw, so the base fertilizer is generally used. It is required to apply 1100-1500 kg of organic fertilizer per mu, 10 kg of urea, 25 kg of superphosphate, 150kg of plant ash (or 15 kg of potassium chloride), or 1100-1500 kg of organic fertilizer plus 35% compound fertilizer per mu. The potato can be sprayed twice with 0.35% potassium dihydrogen phosphate solution 50 kg at full bloom, each time at an interval of 7-10 days.

6. the experiment of rice straw mulching rice stubble net potato straw mulching showed that the unit proportion of corn straw and sorghum straw was large, and the mulching was not comprehensive, which affected the commercial characters and nutritional value of potato. On the other hand, straw is easy to obtain, low cost and easy to popularize. therefore? Do you know how to feed Qiao Qiao, Jing Jing, Jing Xun, Xun Xun, sleigh, and team enzyme? 1300 kilograms. The specific method is as follows: immediately after sowing and fertilizing the potato, the straw is uniformly covered with the whole box by the method of perpendicular to the box and the tip of the straw to the tip of the grass, and the thickness of the grass cover reaches 10-15cm.

7. Aphids and grubs are the most harmful pests to potato. Spray 2.5% deltamethrin with 2500 times water at the initial stage of aphid occurrence; prevent grubs from being sprayed on 35 kg fine soil with 500 grams of water added by 90% crystal trichlorfon and sprinkled into the box during sowing. The main diseases of potato are late blight, bacterial wilt, ring rot and virus. Generally through the selection of disease-resistant varieties, production of virus-free seed potatoes and reasonable rotation, not continuous cropping with Solanaceae vegetables and other measures to prevent the outbreak of virus disease, ring rot and bacterial wilt. In the early stage of the onset of late blight, that is, if there are central diseased plants in the field at the early flowering stage, 25% metalaxyl WP500 or 100 grams of potato plague should be sprayed immediately, once every 7-10 days, for a total of 2-3 times.