Spring anti-corrosion onion yields high yield

When onions are harvested, bulbs often rot. In order to prevent and rot damage, measures should be taken in the spring. First, the disease caused by decay of onions often occur diseases: 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 plant before spraying without deep ploughing, about 20 days deep loose loose soil 50 cm, can be conducive to root growth and development, improve plant resistance to disease. 2. Apply a well-oiled fertilizer to prevent the fertilization of bacteria. 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. 2. Insect pests such as rotting tigers, golden needleworms, and mantle are used to injure wounds caused by onions. This can easily cause mildew to invade the mold and cause infestation diseases. In addition to the prevention and control of irrigation, in late April to early May, spraying Wanling, Andabat and other pesticides in the ground should be used to prevent adult damage. Third, the rot caused by the lack of nutrient Because of the low temperature in the early spring, the excessive accumulation of ammonium nitrogen in the soil affects the absorption of calcium, potassium, magnesium and other elements, resulting in the lack of physiological diseases of the above-mentioned 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. 4. Decay caused by rainwater and stagnant water The leaf sheath is loose in the late stage of onion growth, and the gap is large. The excessive water in the field will be immersed in the leaf sheath of the lodging plant; the rainwater will be immersed in the leaf sheath of the unresting plant. All of the above factors will cause bulb decay. For this reason, pay attention to drainage and harvest early. (Institute of Vegetables, Shandong Academy of Agricultural Sciences)

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