Many of the eggplants cultivated in the open field will exhibit umbilical cracking. The navel (top) of the eggplant is cracked and the seeds are exposed, and the fruit is no longer inflated, which seriously affects its commercial value.

Part of the umbilical cracking of eggplant is caused by uneven watering. In the early stage of fruit development, the soil was arid, resulting in lignification of the fruit skin and heavy rain or watering at the end of the fruit period. The fruit inside rapidly expanded and the peel did not grow accordingly, thus causing chapping.

However, most of the umbilical cracking of aubergine is mainly caused by the lack of calcium in the plant, and there are five reasons for the lack of calcium:

One, watering too much or heavy rain leaching, washed away the effective calcium in the soil, causing calcium deficiency. This situation is serious in the summer when it is rainy.

Second, 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.

Third, excessive application of nitrogen fertilizer in the soil, resulting in excessive accumulation of ammonium, inhibited the absorption of calcium.

Fourth, the water circulation in the plant produces obstacles. This phenomenon is divided into two situations:

(1) The soil is dry and the plants lack water supply. The calcium cannot be absorbed and supplied;

(2) After heavy rain or watering in summer, the humidity of the air is extremely high, and the transpiration of the plants is inhibited. Roots can not normally absorb water and calcium, resulting in the lack of calcium.

5. In the late growth stage, due to management negligence, serious pests and diseases occur, especially the occurrence of verticillium wilt, wilt disease, root rot, root knot nematode disease, and diseased plants, as well as excessive yield, plant aging and other reasons, the root absorption The function is greatly reduced, causing a lack of calcium.

Measures to prevent cracking of umbilical parts of eggplant: First, calcium fertilizers with higher calcium content such as ammonium, calcium, magnesium, etc.; second, timely watering to prevent drought; third, timely prevention and control of pests and diseases; and fourth, strengthening management and spraying every 20 days. The natural alizarin-Shuofeng 481 solution with a concentration of 0.01% once promoted the growth and development of the root system and enhanced the plant's absorption capacity. Fourth, 0.3% ammonium-calcium-magnesium was used every 3 to 7 days when the air humidity was high in the rainy season. The solution was topdressed once.

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