Study on Growth Inhibition Phenomenon of Watermelon Seedlings in Protected Cultivation at Low Temperature and Weak Light

Heilongjiang Province Qingnong Watermelon Research Institute Zhang Zhiyou

Heilongjiang Province Qingfa Agricultural Development Co., Ltd. Zhang Hongwen

With the development of protected cultivation of watermelons in recent years, more and more precocious watermelon cultivation has been carried out in protective facilities such as plastic greenhouses and plastic sheds, and remarkable economic benefits have been achieved. However, due to the limitation of science and technology development and natural conditions, protected land cultivation will suffer from unfavorable conditions such as low temperature and low light in greenhouses and other unfavorable conditions when weather from March to April is abnormal and continuous rainy weather is encountered. In the tropical regions of Africa, it is a kind of crop that likes and adapts to the high temperature and strong light environment. Low temperature and low light will lead to the inhibition of growth of watermelon seedlings. Its main performance is that the growth of new vines and young leaves is obviously delayed or even stopped. In severe cases, the growth points of the seedlings are bent and disappear, showing self-sealing.

The disappearance of growth points occurred in watermelon seedlings cultivated in protected areas, which was different due to differences in the degree of adversity of different varieties, low temperature and low light, and cultivation and management conditions. Generally in 1 to 2 true leaves, when the night temperature in the facility is lower than 15 degrees, the watermelon seedlings will appear dwarfing and growth stoppage. When the temperature is lower than 10 to 13 degrees, some varieties begin to disappear. This phenomenon is often more severe in mid- and late-maturing and large-fruit varieties than in early-maturing varieties because large-fruit varieties usually require higher ambient temperature and light intensity than early-maturing varieties, and are therefore more susceptible to low-temperature and low-light environments. In 4 to 5 true leaves or even larger seedling ages, there will also be physiological dislocations where growth points disappear.

When it is found that the growing point of watermelon seedlings cultivated in protected areas disappears, it is generally not necessary to

In panic, when the environmental conditions return to normal, new growth points can be created from the leafhoppers of the seedlings.

Take out new shoots. Seedling seedlings found in watermelon seedlings without growth points, as long as the seedlings are robust and no other diseases, generally can continue to colonize the cultivation of the shed, does not affect the normal growth of late seedlings and fruit set and fruit. The watermelon seedlings that have been planted in the greenhouse have no growing point phenomenon, and some auxiliary cultivation facilities that increase the temperature and light in the shed can be adopted according to the conditions. Such as adding a film cover, erecting a reflective film on the north side of the shed, and adding biological fill light. It is also possible to improve the nutrient conditions of watermelon seedlings by increasing the management of fertilizer and water, and accelerate the restoration of new growth points of seedlings. Therefore, there is no growth point phenomenon in the protected watermelon seedlings, generally does not affect the later normal growth and fruiting melon, but will delay the growth period of watermelon, delay the flowering period, and the fruit matures later.

Milk Booster

Milk Booster,Breast Milk Booster,Milk Booster Supplement,Milk Production Boosters

Tangshan Finely Animal Care Co.,Ltd , https://www.faczyme.com