Key management techniques for chives in hot and rainy weather
In hot and rainy weather, summer management of chives should focus on weed removal and drainage of waterlogged areas, strengthening fertilizer and water management and pest and disease control, and reducing the number of harvests to promote vigorous growth of chives.
No harvesting. High summer temperatures lead to low nutrient accumulation and high consumption in chives, affecting plant growth, and the leaf tissue fibers increase, the texture becomes coarse, and growth weakens. From late June to early August, harvesting should be stopped to benefit root development. In August to September, 1 to 2 harvests may be made, and harvesting should stop after late September. For the last harvest, the stubble should be left slightly higher. Due to favorable factors such as no harvesting, sufficient fertilizer and water, and vigorous growth, chives often lodge in summer. After lodging, they are prone to rot and can be induced by blight, causing death. Measures to prevent lodging are: do not apply excessive nitrogen fertilizer; do not overwater; frequently prevent waterlogging during heavy rain; when chive leaves are too long and lodging may occur, the chive leaves should be cut shorter.
Weeding. High summer temperatures and rainy autumn weather cause weeds to grow and affect the growth of chives, so they should be pulled out in time.
Removing flower stalks. Because flowering and seed setting in chives consume a large amount of nutrients and affect plant growth, tillering, and the accumulation of nutrients, thereby affecting the next year's yield. Therefore, except for seed-production fields, the young chive stalks should also be removed in time to cultivate high-yielding plants.
Preventing and controlling Fusarium wilt. In summer and autumn, high temperatures, or intense sun exposure after rain, make Fusarium wilt likely to occur. The symptoms are water-scalded lesions near the ground, and in severe cases the whole plant dies. In management, attention should be paid to drainage and waterlogging prevention, and removing yellow leaves to keep good ventilation between rows and reduce disease damage. It can also be prevented by drenching the roots with a 500-fold dilution of 50% carbendazim.
Preventing and controlling chive maggots. Chive maggots occur rather seriously in summer. A 800-fold dilution of 50% phoxim can be used and slowly flowed into the water furrow together with irrigation. It can also be applied as phoxim granules when fertilizing and preparing the soil after harvesting chives, or during the peak occurrence period of chive maggot larvae, use 0.75 to 1 kg of 20% "chive maggot net" per mu mixed with 1000 kg of water for root irrigation.