Abnormal growth of watermelon seedlings
Abnormal growth of watermelon seedlings and its coping methods: æ²¤æ ¹â—In the case of continuous rainy days, low seedbed temperature and high bed soil moisture, the roots of the seedlings stop growing, the main roots and lateral roots become rust-colored, and when the roots are decayed, the roots of the roots do not develop new roots. Yellow, heavy seedlings are wilting. Rooting â—In the case of applying unfertilized organic fertilizer or excessive amount of chemical fertilizer, the soil in the seedbed is dry, the roots are yellow, no new roots are formed, the growth on the ground is slow, and the plants are short and brittle, forming small old seedlings. Yellow seedlings weak seedlings â— Mainly due to long-term low temperature and low temperature, high humidity, low nutrient level, and weak seedlings form yellow seedlings. Seedlings from the top of the seedlings do not grow long, only two cotyledons or one or two true leaves without topping seedlings, commonly known as self-sealing. The main reasons are: â— The concentration of the drug used in the nursery period is too large, causing phytotoxicity at the growth point. â— After the seedlings are unearthed, they suffer from certain pests and cause self-sealing seedlings. â— During the seedling period, the temperature of the seedbed is too low, or the growth point of some seedlings condenses the cold water droplets, causing freezing damage at the growth point. Overcome measures 1 When the first true leaves of 90% of the plants are displayed, raise the temperature of the seedbed to 25~27 °C. If the temperature is lower than 16 °C, use light or electric heating line to warm up. After the expansion of the 2 leaves, the water requirement of the watermelon seedlings increased significantly, and the water should be replenished according to the humidity of the bed soil to keep the bed soil moist. 3 In the early spring, there are many rainy and cold weather in the nursery period. After the temperature rises, it should be ventilated in time. At the same time, try to increase the time of receiving light and prevent the seedlings from growing into weak seedlings. When the roots occur, stop spraying immediately, and sprinkle some fine dry soil or coal ash, grass ash, etc. on the surface of the bed to make the bed soil temperature rise as soon as possible. It was found that water was sprayed in time to burn the roots, and the humidity of the bed soil was increased. The water spray was stopped 5 to 7 days before the planting, and the seedlings were sprayed. For the lack of nutrient yellow seedlings in the nursery soil, 0.2% high-purity potassium dihydrogen phosphate (phosphorus potassium source pool) can be sprayed on the noon on sunny days. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Household Electric Appliances,Smart Home Appliances,Small Household Appliances Ningbo Shuangtuo International Trade Co., Ltd. , https://www.nbst-sports.com