Citrus iron deficiency prevention and treatment
1. Citrus iron deficiency symptoms Generally, the lesions in thin leaves of young shoots are yellowish, and the leaves are pale green to yellowish-white. The veins are obviously green and reticular. The young leaves on the top of the branchlets are more obvious, but the old leaves of diseased trees remain green. When the iron deficiency is severe, except for the main petiole near the petiole, the whole leaf turns yellow to yellowish white, loses luster, the leaf margin becomes brown and broken, and the leaves of the whole plant turn orange to white. The branches of the diseased branches are delicate, and the leaves on the young branches are easy to fall off. Often there are only a few leaves on the base, and there are many leafless bare branches in the whole tree, and a large number of dry branches emerge one after another. After the leaves of the twigs fall off, normal branches and leaves grow on the lower branches, but the top leaves gradually die. When the seedlings are deficient in iron, the old leaves are green and the leaves of the new shoots are yellowing. The more the top leaves become yellowish-white, the top leaves are even white. 2. Causes of iron deficiency in citrus In alkaline, salinity, or calcium-rich soils with a pH of 7.5 or more, a large amount of soluble ferrous iron is converted to insoluble trivalent iron salts and precipitated. The content of soluble iron is greatly reduced and easily occurs. Iron deficiency. The stalk anvil is the least resistant to alkali, and in the alkaline soil, sorghum anvil and Satsuma orange are prone to iron deficiency. During the cold and dry winter and spring seasons, the underground water vaporizes, the salt content in the topsoil increases, the soluble iron content decreases, and the root absorption is affected. Iron deficiency symptoms often occur in summer. Too much orange orchard, the soluble iron in the soil is easy to lose, causing iron deficiency. Excessive application of phosphate fertilizer, or the content of copper, manganese, zinc and other elements in soil is too high or excessive absorption, affect the solubility of iron can not be absorbed, or absorbed in the tree after the move to lose activity, often induced iron deficiency. Iron deficiency in soil is sometimes accompanied by zinc deficiency, manganese deficiency and magnesium deficiency, which causes citrus to exhibit various symptoms of deficiency. 3. Iron deficiency iron correction method Increase the application of organic fertilizer alkaline soil concentrated pig manure, green manure, slag and other fertilizers. Soil application of chelated iron preparations during the spring shoot growth period. The EDDHA chelated iron solution was applied on the canopy drip line to dig 250 px or so. The young tree was 5-10 g per plant, and the adult tree was 15-30 g per plant. Foliar spraying chelated iron preparation leaf spraying EDDHA chelated iron or EDHA chelated iron. The method of connecting rootstocks to strong alkaline soils once and for all is to rely on alkali-tolerant rootstocks such as lime, orange, and orange. To prevent citrus orchards with high groundwater levels in the orchards, do a good job of drainage and prevent the orchards from getting too wet and lack of oxygen. Hand & Foot Care,Foot Care,Feet Care,Total Foot Care Guangzhou Lingxue Cosmetics Co., Ltd , https://www.lxgj188.com