In summer, the top of the eggplant (navel) is cracked and the seeds are exposed and the fruit is no longer inflated. Some lands are severe, as much as 1/4, which seriously affects the output and commodity value.
The cracking of the top of the cannabis is mainly caused by calcium deficiency. The main cause of calcium deficiency is due to the lack of calcium in the soil, heavy rain leaching, excessive nitrogen fertilizer, excessive air humidity, and serious diseases. In the early stage of fruit development, the soil was arid, resulting in lignification of the fruit skin. In the later period, heavy rain or watering was uneven, and the fruit inside rapidly expanded, and the peel did not grow and cracked accordingly. However, the main cause of cracking of the top of most eggplants is the lack of calcium in the plants. The causes of calcium deficiency and prevention measures are as follows:
Causes of calcium deficiency
Calcium deficiency: lack of calcium in the soil, especially in continuous cropping plots, without paying attention to the application of calcium fertilizer, resulting in calcium deficiency. This phenomenon is more prominent in greenhouses and greenhouses.
Excess nitrogen: Excessive application of nitrogenous fertilizer in the soil results in excessive accumulation of ammonium nitrogen and inhibits calcium absorption.
Excess water: watering too much or heavy rain leaching, erosion of the effective loss of calcium in the soil, resulting in calcium deficiency. It is serious when it is rainy in summer.
The ground temperature is too low: in winter, the ground temperature is low, and the accumulation of ammonium nitrogen in the soil is too high, which inhibits the absorption of calcium. This phenomenon is common in winter greenhouses.
Growth disturbances: that is, the water circulation in plants causes growth to be hindered. 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.
Insect pest damage: 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 The function is greatly reduced, causing a lack of calcium.
Prevention and cracking measures
Increase calcium fertilizer: calcium fertilizer with higher calcium content such as ammonium, calcium, magnesium, etc. is used in the soil.
Proper watering: Drought watering in time, but can not be poured too much. The rain will be drained in time to prevent flooding.
Strengthen management: In addition to doing a good job of pest control, every 20 days, natural boraxin - a one-ten thousandth of a solution of fengfeng 481 is sprayed once to promote root growth and development and increase absorption capacity.
Exogenous fertilization: When the air humidity is high during the rainy season, 0.3% ammonium calcium magnesium solution is used for extra-root dressing every 3-7 days.
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