Prevent onions from freezing damage and ensure their safety for the winter

Prevent the onion from freezing damage and ensure its safety for the winter:

Onions are more adaptable to temperature. Seeds and bulbs can slowly germinate at 3-5 °C, accelerate at 12 °C, grow moderately seedlings at 12-20 °C, leaves at 18-20 °C, bulbs at 20-26 °C, robust seedlings can withstand -6-7 Low temperature of °C. Bulb expansion requires higher temperatures, bulbs do not expand below 15 °C, and 21-27 °C grows best. If the temperature is too high, it will grow and fall into dormancy. However, if the temperature is too low, it will cause harm to it. The following is the prevention strategy of onion freeze damage.

1. Planting period: Shandong Province and the peninsula inland areas, planted from the end of October to the beginning of November, can slow down the seedlings before winter, and can restore root growth, issuing 3-4 new roots to form strong seedlings. The coastal areas of Qingdao, Weihai and Yantai in eastern Shandong can also be planted in spring, which can be planted before and after the vernal equinox.

2. Spraying Tianda 2116: After planting the onion seedlings, spray 600 times Tianda 2116 drought-resistant and strong seedling-specific type, once every 10-15 days, even spray 2 times to promote hair roots and improve the cold resistance and disease resistance of the plants. And adaptability to prevent freezing damage.

3. Strengthen the management before winter: first plant the seedling water after planting, after 2-3 days, carefully plan to promote the roots to restore growth. Before freezing, it is necessary to re-water the winter water, then carefully draw the soil, then use the raft to push the topsoil to improve the ground temperature and protect the soil, and ground the soil dung or wheat bran, grass, or cover the mulch to protect the winter. .