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Coastal autumn and winter potato cultivation
Sandy loam soil in the coastal areas with no frost is selected for planting potatoes in autumn and winter. The market from February to April just fills the off-season of the vegetable market. The main points of cultivation techniques are summarized as follows: Site preparation. Choose coastal non-frozen areas all year round, should not be selected before the solanaceous crops (such as eggplant, tobacco, pepper, etc.) or root crops for the rotation, but before the election as cereals, beans and other crops. Planted land is preferably sandy soil with fertile soil and convenient irrigation and drainage. Land preparation. Potatoes are deeply ploughed and require deep soil and loose soil. Deep plowing should be done before the harvest, and it should be carried out as early as possible. Generally, it is 0.9 meters wide, 0.2 meters high and 0.2 meters wide. Apply base fertilizer. The amount of basal fertilizer is 30 mu for composting fecal droppings. It is applied to the field one month before the next seeding type; 50--100 kg of compound fertilizer is to be added, applied to the field in conjunction with the whole hoe or digging the culm in the rake to apply the mulch afterwards. Selection type. Kexin No. 3 and Zihua 851 can be used to produce high-yield virus-free varieties (about 130 days of growth period). Seed treatment. The third-generation virus-free seed Potato purchased from Heilongjiang was selected and cut into 30-gram lengths depending on the size of the seed potatoes. Each potato block contained 1--2 buds. Seeding timely sowing. Sowing dates range from mid-October to early December, and are harvested from early March to early Qingming. Closely planted. The general density is 3000--4000 holes per acre, spacing is 0.3 meters, and the distance between holes is 0.35 meters. Each kind of two lines, each hole, the amount of about 250--280 pounds per mu. Sowing depth. Drought and soil masses are usually 10- to 15-centimeters, and wet and soil-weighted plots are suitable for 10 cm. After sowing, it is best to use 500 kg of fire earth to cover species. Weeding. 5-6 days after sowing with butachlor spray evenly on the surface. Cultivate soil in field management. For the first time, Miao grass should be cultivated in a timely manner after Miao Qi. The second cultivator can be carried out at a height of about 10 cm. The third time in the budding stage, soil is mixed with earth and the diseased plants in the field are removed. Timely top dressing. In the seedling stage combined with seedling inspection, seedling compensation, and cultivator, the first topdressing is applied, and 10 kg of compound fertilizer is applied to the middle of the loquat, and the soil is covered with water, and 500 times the concentration of zincphos-phosphorus plus 0.5% urea is used for seedlings. To prevent underground pests. About 30 days after emergence, about 10 kilograms of mu were topdressed again, after which it was determined whether or not to catch up with the growth of seedlings. Timely watering. Seedlings should be properly watered according to the situation to ensure that the soil is moist, from budding to flowering. It is the peak period of potato water requirement. It should be combined with top dressing to water irrigation. Mushi compound fertilizer can promote 10 kilograms of tuber enlargement. Pest control. After the seedlings were sprayed with Tiandi copper pesticide to prevent epidemic diseases, the plant dragons were sprayed 1500 times every 7-10 days in the middle and late stages of growth to increase the crop resistance, and 25% Rhizoctonia sp. wettability was sprayed. 800 times of powder or 1500 times of agricultural streptomycin or 500 times of methormry copper, spray 2 - 3 times. Plants with virus-infected mosaics, leaf curls, dwarfing, etc. should be removed promptly.