First, the lack of yellow and yellow nitrogen deficiency. The yellow leaves begin to yellow from the tip of the old leaves, then gradually extend from the stems and leaves to the heart and leaves, and finally develop into yellow-green in the whole plant. Seedlings grow slowly, and yellow seedlings look green in the distance. In severe cases, the cobs are inwardly pointed by the tip and the leaf margin. Should apply topdressing nitrogen fertilizers such as ammonium bicarbonate and urea in time. Yellow potassium deficiency. It mainly occurs in high-yield paddy fields with large amounts of nitrogen and phosphorus. The early stage of the diseased seedlings showed slow growth, short plant type, few tillers, straight leaves and clustered top leaves. The young leaves of the dark green dull lower tip of the old leaf first yellow, with different sizes of auburn spots, the latter along the leaf veins to the base of the expansion, and finally the whole leaf into auburn withered, from afar like fire burned, this typical lack Potassium abrinosis should be immediately drained, and gap irrigation should be used to top up potash fertilizers, such as potassium chloride and ash. Zinc deficiency yellow. Mainly occurs in the cold-waterlogged fields in the mountainous area, and the peak incidence usually occurs about 20 days after transplanting. The midrib of the leaf base yellows first, followed by yellow-red or reddish-brown spots, the leaves become narrow, the veins of the leaves become brittle, the leaves age rapidly, and the new leaf leaves at a slow and narrow base. Midrib brownish green, available. Zinc sulfate and other fertilizers are used for remediation, such as multiple foliar sprays with 0.1% zinc sulfate. Second, poisoning yellow hydrogen sulfide poisoning. The roots were black and smelled of rotten eggs. The white roots were small and the fine feathers were present. The old leaves of the base were yellow-brown and the tips of the leaves were dry and then the old leaves died. There were only 1-2 new green leaves in the upper part. Organic acidosis. The roots of rice plants were atrophic and new roots rarely occurred. The plant epidermis fell off. The color of the leaves is yellow, or atrophy occurs. When severe, the lower leaves die and die. The solution to this problem is to immediately drain water from the rice fields where toxic yellowing occurs, improve soil permeability, and enhance oxygen detoxification. In combination with cultivator, nitrogen, phosphorus and potassium available fertilizers are applied during rejuvenation in dry fields to improve the nutritional conditions of rice plants. In soils with too much organic acid, use soil amendments such as quicklime to neutralize acids and eliminate harmful substances. Third, fertilizer damage or drug damage yellow carbon ammonium, ammonia, pesticides, etc. If not properly applied, it will cause poisoning yellow, resulting in a piece of rice leaf into a bright yellow or golden yellow smoke, sometimes yellow spots on the burning spots. When the phytotoxicity is severe, the leaves appear spotted, chlorotic, axillary or withered, yellow, and even the whole plant withered. If it is found in time, it can be used to fill the fields and spray water to reduce the degree of injury. In addition, after the occurrence of fertilizer damage or phytotoxicity, topdressing fertilizers such as urea should be topdressed to enhance crop growth and enhance resistance. Fourth, disease infection yellow leaf blight yellow leaves. On the leaf tip or leaf margin of the leaves, yellow, green or dark green spots are produced first, then expanded into spots along the veins, appear gray, the diseased part and the healthy part are distinct, and the lesions often have yellow plasticity. Bacteria pus." Bacterial streak yellow leaves. The yellow-brown leaf of the heart is dead like a fake and dead heart seedling. There are brown streaks on the leaf blade and leaf sheath. The yellow "bacterial pus" can be seen on the lesion after breaking off the midrib. When the disease is felt late, the leaves from the top to the half leaf are white and white. Red. Bacterial base rot of rice yellow leaf. The leaves are withered and curled, and some have become yellow withered. It seems that the stem borer caused by the damage of the three stem borer, but the base of the stem is often black, and the stem sections become hard and brittle, easily broken and have a rancid odor. Physiological premature aging yellow leaves. Spread from the bottom up, the diseased leaves mostly appear orange-yellow, with a certain amount of metallic luster, and they occur in patches or in fields. There are no lesions on the yellow leaves and no pyomesus. Physiological premature aging Yellow leaves are due to a decline in root vigor of rice biology, or a physiological yellow leaf phenomenon associated with the variety. The prevention and control method is to use rice varieties that are resistant to premature senescence, and to prevent premature water shortage in rice fields, and to maintain moist irrigation. The yellow leaves caused by bacterial leaf blight, bacterial leaf streak, and bacterial base rot are all caused by bacterial diseases. For example, carbendazim, Ye Qing, and other drugs are used, and when the disease is controlled, the disease is controlled. Topdressing secondary fertilizers will help control the spread. China Agricultural Network Editor
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