In recent days, readers’ calls have been reported to reflect the fact that the tomatoes they planted in greenhouses have suffered top cracking, which has led to a decline in the commercial quality and has seriously affected economic efficiency. Leaf Class,Ginkgo Biloba,Eucommia Leaf,Types Of Leaves Class Henan Qiancuntang medicial technology co.ltd. , https://www.qctchineseherb.com
Top cracking of tomatoes is mainly manifested in the cracking of the umbilicus, and the seeds are exposed, especially when the umbilical part of the fruit is near mature, and it is chrysanthemum-like. The vegetable traders are not willing to accept it. The author believes that the reasons for the top cracking of tomatoes are mainly in the following three aspects: First, high temperature barriers lead to poor flower bud differentiation, and second, poor calcium or calcium malabsorption, and third, severe temperature changes or improper water and fertilizer management.
First of all, high-temperature barriers lead to poor flower bud differentiation and the formation of malformed flowers, and malformed flowers are an important cause of top cracking. On the one hand, due to the variety of tomatoes, they are not tolerant to high temperatures and have poor adaptability to temperature. On the other hand, the summer temperature in the shed is too high, and the ventilation is not timely during the management of the greenhouse, resulting in a temperature of more than 40 degrees before and after noon. These two reasons cause poor flower bud differentiation of tomato plants, resulting in malformed fruit such as top cracking fruit.
Second, calcium deficiency or calcium malabsorption. The lack of calcium in the flowering stage will cause the stigma of the female flower to crack and form malformed flowers. At the later stage, it will gradually form the malformed fruit of the top crack as the fruit grows and develops. In addition, calcium has the function of increasing the thickness of the cell wall. If calcium is absent, the thickness of the cell wall becomes thinner, increasing the probability of cracking.
Finally, severe temperature changes or improper management of water and fertilizers. In recent days, even when it rains on cloudy days, the temperature inside the shed is low. After the weather turns fine, the temperature suddenly rises. This changes the shade, causing the temperature in the shed to change drastically, and the growth rate of the flesh is not in sync with the growth rate of the peel. Cracking occurs. Improper management of water and fertilizer, such as uneven watering, pouring large water before and after noon, excessive application of chemical fertilizers (high nitrogen, high potassium fertilizers), will affect the absorption of trace elements in plants, resulting in malnutrition of the fruit, so that the fruit appears to be easily cracked Case.
To prevent the top cracking of tomatoes in the past summer, the author proposes to adopt the following measures: 1. Appropriate shading and cooling to avoid overheating in the shed. This can be achieved by laying shade nets, spraying cooling agents and other measures. 2. Timely supplement of calcium fertilizer, can be sprayed with foliar aromatic high calcium leaf fertilizer 500 times every 7 days spray once, 2 or 3 times. Boron deficiency can lead to poor absorption of calcium, so it is also necessary to properly add boron fertilizer, in the spray of calcium fertilizer while adding "Bo Ermei", "Sorry Boron" and other boron-containing foliar fertilizer. 3. Strengthen the greenhouse temperature and humidity control, according to the outside weather changes and soil moisture management to avoid drastic changes in greenhouse temperature, uneven soil moisture, partial application of chemical fertilizers, etc., so as to create suitable for tomato growth and development of environmental conditions.