When onions are harvested, bulbs often rot. In order to prevent rot, measures should be taken in the spring. Diseases often caused by rotting onions are: soft rot (bacterial diseases) and stalk rot (fungal diseases). Control methods are: 1. Pay attention to crop rotation, bogey and onion and garlic crop re-slaughter. Cultivation as deep as possible 30 cm, such as the use of rotary plough, you need to be planted before the application of deep ploughing, the soil loose and transparent deep 50 cm, can be conducive to root growth and development, improve plant resistance to disease. 2. Apply ripened fertilizer to prevent fertilization. 3. Use ridges as much as possible. 4. Control the amount of nitrogen fertilizer in the growth period, and the combination of nitrogen, phosphorus and potassium should be applied. 5. Pay attention to timely drainage in the bulb formation period to avoid long-term accumulation of water. 6. Prevent pests in time to avoid causing wounds. 7 before the onset of the following agents: 72% agricultural streptomycin 4000 times, 50% potassium copper WP wettable powder 500 times and 72% Kelu wettable powder 600 times, 405 Fuxing EC 8000 times alternating Spraying. Insect pests such as rotting tigers, golden needle beetles, and mantle pests are harmful to the wounds caused by onions, and it is easy for molds to invade and cause rotten, and at the same time can cause infectious diseases. Should spray Wanling, hit and other agents to prevent adult damage. The rot caused by lack of nutrients due to the low temperature in early spring, the excessive accumulation of ammonium nitrogen in the soil, affect the absorption of calcium, potassium, magnesium and other elements, resulting in the lack of physiological diseases of the above fertilizer elements. Excessive application of nitrogen fertilizer during the growth period can also result in the lack of these elements. Due to the lack of these elements, the leaves are chlorogenic and the tips of the leaves are dry. At the same time, the outer and inner scales of the bulbs are also dry and rot. For this purpose, nitrogen, phosphorus and potassium should be used in combination with cultivation. During the growth period, high-energy red potassium and 0.2% calcium nitrate solution can be applied to supplement potassium and calcium. On the other hand, when the decayed onion is in the late growth stage, the sheath of leaves is loosened and the gap is large. The water in the field will be immersed in the leaf sheath of the lodging plant, and the rain will be immersed in the leaf sheath of the unreplaced plant. All of the above factors will cause bulb decay. For this reason, pay attention to drainage and harvest early.
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