Most of the eggplants that have been cultivated on the open ground have cracks on their tops. Cracked eggplant, cracked at the top (umbilical), the seeds are exposed and the fruit is no longer inflated. Some lands have become severe, as much as 1/4, which has seriously affected the value of commodities.
Some of the reasons for the top cracking are caused by uneven watering. During the early period of fruit development, the soil was dry, causing the fruit skin to be lignified. After heavy rain or watering in the later period, the fruit inside quickly expanded, and the peel did not grow accordingly, but split. However, the main cause of the cracking of the top of most eggplants is the lack of calcium in the plants. There are six reasons for the lack of calcium:
1. The lack of calcium in the soil. In particular, continuous cropping plots do not pay attention to the use of calcium fertilizers and cause calcium deficiency. This phenomenon is more prominent in greenhouses and greenhouses.
2. Too much water or heavy rain leaching, the loss of effective calcium in the soil erosion, resulting in the lack of calcium. It is serious when it is rainy in summer.
3. Too much nitrogen fertilizer in the soil causes excessive accumulation of ammonium nitrogen and inhibits the absorption of calcium.
4. In winter, the ground temperature is low, and iron-nitrogen accumulation in the soil is excessive, inhibiting the absorption of calcium. This phenomenon is common in winter greenhouses.
5. Water circulation in the plants creates obstacles. This phenomenon is divided into two cases: First, the soil is dry, the plants lack of water supply, calcium can not be absorbed and supplied; Second, after heavy rain or watering in summer, the air humidity is very high, inhibiting the transpiration of the plant, the root can not Normal absorption of water and calcium, resulting in the lack of calcium.
6. In the late growth stage, due to management negligence, serious pests and diseases, especially the occurrence of Verticillium wilt, blight, root rot, root knot nematode disease, diseased plants, and excessive production, plant aging and Other reasons, the root absorption function is greatly reduced, Causes a lack of calcium.
Calcium deficiency in summer is mainly due to soil calcium deficiency, heavy rain leaching, excessive nitrogen fertilizer, excessive air humidity, and serious diseases.
Measures to prevent cracking on the top of eggplant include: calcium fertilizer with higher calcium content such as ammonium, calcium, magnesium, etc. in soil; watering in time to prevent drought; timely control of pests and diseases; strengthening management, spraying natural alkaloids every 20 days - One-tenth of a solution of SF 481 once promotes root growth and development, and increases absorption capacity. When air humidity is high during the rainy season, every 3 to 7 days, 0.3% ammonium calcium, calcium and magnesium are used for the top dressing.
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Bagging Scale System
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