Crop nitrogen deficiency: the new shoots are thin and short, the leaves are small and erect, the color is grayish green, the petioles, veins and surface layer turn red; the flowers are small, the fruit is precocious, it is easy to fall off, the roots are underdeveloped, the fine roots are more, the roots are less , the new roots are yellow.
Phosphorus deficiency in crops: different crops have different symptoms. When corn is deficient in phosphorus, it will show slow growth at seedling stage, 5 leaves are more obvious, leaf color is purple, grain is not full; wheat phosphorus deficiency is characterized by slow growth of seedlings The root system is dysplastic, the tiller is reduced, the base of the stem is purple, the leaf color is dark green, slightly purple, and the ear small particles are small; when the rice is deficient in phosphorus, the tiller is reduced, the plant is short, the new leaves are dark green, the old leaves are purple, and the flowers are less grainy. .
 Potassium deficiency in crops: The initial performance is that the tip of the lower leaves turns yellow, and gradually turns yellow along the edge of the leaves, but the leaves and veins of the veins remain green. When severe, they gradually develop upward from the lower leaves, eventually leading to the yellowing of most leaves and the edges of the leaves. It is burning. Potassium deficiency in cereal crops showed weak tillering, short internodes, weak leaves, and soft and easy stalks. Deficiency of potassium in dicotyledonous leaves causes the leaves to curl, gradually shrink, and sometimes the leaves are broken, but the middle part of the leaves remains green.
Aluminum Spiral High Speed Door
The Spiral door offers high-speed operation for high-traffic situations and rigid aluminum slat construction that eliminates the need for a second security door. Crisp lines give the Spiral door a stylish look that's great for many types of commercial, automotive retail, government, institutional and industrial applications. The Spiral is ideal for automotive dealerships, government, parking and security. Benefits No metal-to-metal contact reduces wear on the door panel and offers fast, quiet operation.
Aluminum spiral High Speed doors are usually used wherever goods traffic occurs and where the doors have to fulfill special requirements. In the food and beverage industry, or Medical industry for example, special climatic conditions have to prevail; short opening and closing times reduce cooling loss, avoid airflow and enable a smooth operating procedure. They can also be designed in larger dimensions for the mining and aircraft industries.
Aluminum Spiral High Speed Door,Simple Hard Fast Door,High Speed Spiral Door,Metal Hard Fast Door
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.hfrollershutterdoor.com