Key Cultivation Techniques for Potatoes After Flooding

Select good varieties It is advisable to choose varieties with good shape, high yield, fast tuber expansion, and tolerance to high temperatures at the seedling stage, such as Kexin No. 4, and it is best to use virus-free seed potatoes.

Selecting seed potatoes and sprouting Seed potatoes should be spring potatoes harvested in the same year, and diseased potatoes, rotten potatoes, damaged potatoes, and poorly shaped tubers must be strictly removed, with small whole tubers of 20-40 g being the best. In autumn, whole-tuber sowing should be used, with seed potatoes of about 25-50 g and a sowing rate of 150-200 kg per mu. Soak whole tubers in 1 g of gibberellin mixed with 120-180 jin of water for 15-20 minutes in mid-to-late July, place them in a cool place to sprout naturally, and when the sprouts grow to 1.5-2 cm, they can be sown.

Sowing For autumn sowing, sowing should be appropriately delayed, generally from August 8 to 15, and choose weather with no heavy rain within 2-3 days for sowing. Open shallow furrows, run water into them, and sow; the furrow depth is 8-10 cm, and sow after the water has seeped down. Then cover with soil and form small high ridges, with a ridge height of 8-10 cm.

For plastic film mulching, wide and narrow row planting should be used, and sufficient base fertilizer should be applied together with sowing. Use a large row spacing of 70-75 cm, a small row spacing of 30-35 cm, and a plant spacing of about 20 cm. Broadcast 30-40 kg per mu of potassium sulfate compound fertilizer between the two small rows. After covering with soil, the ridge height is 5-6 cm and the width is 60-70 cm, then cover two rows with plastic film, and all of the plastic film must be covered with 1-2 cm of soil, preferably so that the film cannot be seen; after every heavy rain, the parts where soil has been washed away must be covered with soil again. Seedlings can emerge 4-6 days after planting, and the film can be broken to release the seedlings; at the same time as releasing the seedlings, cover the broken film openings with soil.

Fine management, scientific and reasonable watering After the seedlings are uniform, water once to ensure uniform seedlings, and after the plants form a cluster, water once more. After entering October, potatoes enter the tuber expansion stage, and the furrows should be kept moist; in dry weather, water once every 7-10 days, and never use flood irrigation.

Scientific fertilization and reasonable hilling For open-field cultivation, during the potato rosette stage, apply 2-3 cubic meters of organic fertilizer and 50-75 kg of special fertilizer for potatoes, and carry out one hilling. In mid-October, when the tuber expansion stage begins, apply another 25-50 kg of ammonium sulfate fertilizer and carry out another hilling.

Integrated control of pests and diseases The main pests harmful to potatoes include ladybugs, beet armyworms, diamondback moths, aphids, and others. Main pesticides selected: Cainong 600-800 times; 2% Yake 1500-2000 times; 2.5% Kungfu 2000-2500 times, etc., sprayed alternately, once every 7-10 days. Generally, from mid-September to mid-October, spray a protective fungicide once every 7-10 days, choosing 80% Mengfeiling, 8% Daconil M45, 58% Zaoyiling-manganese zinc, and 50% Aisite 600-800 times, applied alternately. After disease occurs, 58% Redomil, 72% Kelu, and 50% Anke mixed with Aisite 600-800 times can be selected for spraying. Once every 7-10 days, for 2-3 consecutive times.

Spraying regulators During the tuber formation stage, promptly spray "Tianda-2116" special 750-times solution for underground roots and tubers together with pest control. After an interval of 10-15 days, spray "Tianda-2116" at 750 times 2 more times at 7-10 day intervals, which can stabilize the plant cell membrane, promote growth, and control excessive growth.