Observe leaf changes, touch leaf temperature, observe plant growth status, understand plant cold tolerance prevention measures With climate change and the increase of extreme weather, plants are exposed to cold from time to time. For growers, it is important to judge whether plants are exposed to cold in a timely manner and take corresponding measures. This article will provide you with a detailed introduction on how to determine whether plants are exposed to cold and some preventive measures to help you better protect your plants. Observe changes in leaves. After a plant is frozen, the most intuitive manifestation is the changes in the leaves. The following are some common symptoms of leaf freezing: 1. Leaves turn white: Frozen leaves will turn partially or completely white. This is because the water in the cell fluid freezes, causing the cell membrane to rupture.
2. Leaves become soft: Frozen leaves will become soft and even water can be pressed.
3. Leaf blackening: Leaves that are severely frozen will appear partially or completely blackening, which is a manifestation of cell death. Touch the leaf temperature When the temperature is low, gently touch the leaf with your hand. If you feel that the leaf temperature is significantly lower than the surrounding air temperature, then the plant is likely to have been frozen. Observe the growth status of plants. The growth status of plants exposed to freezing will be affected. The following are some common changes in growth status: 1. Plant growth is slow: The growth rate of plants exposed to freezing will significantly slow down or even stop growing.
2. Plant wilting: Frozen plants will wilting, which is caused by loss of water in the cells.
3. Plant death: Plants severely frozen will die. Understand the cold tolerance of plants. Different plants have different degrees of tolerance to low temperatures. Understanding the cold tolerance of plants can help determine whether plants are frozen. The following are the cold tolerance of some common plants: 1. Cold tolerant plants: such as pine, cypress, bamboo, etc., can still grow normally in low temperatures.
2. Cold-tolerant plants: such as apples, pears, peaches, etc., will slow down their growth rate in low temperatures.
3. Cold resistant plants: such as grapes, strawberries, tomatoes, etc., are easily frozen in low temperatures. Preventive measures In order to avoid plants from being exposed to cold, the following preventive measures can be taken: 1. Choose cold-resistant plants: When planting, try to choose plants with strong cold resistance.
2. Reasonably arrange planting time: Avoid planting plants that are not cold-resistant in seasons with low temperatures.
3. Coverage protection: Before low-temperature weather comes, plants can be covered and protected with plastic films, straw and other materials.
4. Build a greenhouse: For plants that are not cold-resistant, a greenhouse can be built to protect them.
Judging whether a plant is frozen requires comprehensive consideration of factors such as leaf changes, plant growth status, and plant cold tolerance. Through the above methods, growers can discover the freezing condition of plants in time, take corresponding measures to protect them, understand the growth habits of plants, and do a good job. Prevention is also an important means to protect plants from freezing.
References: "China Agricultural Meteorology" Magazine,"Plant Protection" textbook, School of Plant Protection, China Agricultural University.