Prevention and cure of the lack of growth hormone in lotus root

Lotus root, especially for shallow water ponds planted for many years, due to long-term flooding in soil, poor ventilation conditions, iron, zinc, copper and other trace elements in the soil is difficult to meet the needs of the shallow bract growth, showing slow growth, "the lotus leaf is full of stars Without closure, there are symptoms of lack of fertilizer. If you do not use the fertilizer in a timely manner, serious production loss will occur, resulting in greater economic losses.

The nitrogen-deficient lotus leaf is pale yellow in color, with small and thin leaves, short petiole stems, and slender whip. Applying 100 kg of ammonium bicarbonate per acre or 35 kg of urea can rapidly enhance the photosynthesis of lotus leaf growth, which is beneficial to the formation and accumulation of protein and various vitamins in lotus root plants, and increase the yield of lotus root production. However, if too much nitrogen is applied, the lotus leaf color will be dark green, the petiole will be slender, and the pests and diseases will be seriously harmed. The lotus root yield is also not high.

The phosphorus-deficient lotus leaves are small, dark green and lusterless. The lotus whip is thin yellowish brown, black root is more, and white root is less. This is due to insufficient supply of phosphoric acid, and the reduction of nitrate nitrogen in the crop is hindered, affecting protein synthesis and inhibiting cell division. Increase the application of superphosphate 100 kg, can quickly promote the increase of white root, lotus whip slender, to restore the loss of phosphorus in the early growth of lotus root, and promote the accumulation of starch in the late growth of lotus root, branches increased, the main loquat increase, improve lotus root Yield. However, excessive application of phosphate fertilizer, the proportion of nitrogen and phosphorus imbalance, shorten the vegetative growth period, it is difficult to obtain high yield of lotus root; coupled with zinc deficiency in the soil, excessive application of phosphate fertilizer, often caused by the lack of trace element zinc in the growth of lotus root.

Zinc deficiency lotus leaf part chlorosis, showing a patchy or irregular light yellow patches. Only about 3 kg per gram of zinc sulfate is applied to promote the stable production of lotus root.

The potassium-deficient old leaves are yellow-green watermelon rind-like stains, and the petiole is slender and easy to roll. The increase of 30 kg of potassium chloride in the mu can promote the metabolism and synthesis of nitrogen and carbohydrates in lotus root plants, facilitate the synthesis of proteins, promote the synthesis of cellulose in the stems and leaves, and the development of vascular bundles. Thick, enhance Lotus resistance to disease resistance, improve the appearance and quality of lotus root. However, if too much potassium is used, the excessive cellulose content will also affect the edible value of lotus root products, resulting in poor eating habits.

When the iron deficiency began in the period of the peak of growth in July to August, the newly emerged leaves showed a slight wilting on the water surface, and the veins gradually lost the green and faded. There were brown spots on the edges of the leaves and gradually expanded until the whole leaves died, but the underground stems had no symptoms. . In order to prevent iron deficiency symptoms, organic fertilizer should be added when planting, and the amount of nitrogen fertilizer should be appropriately controlled. When there is only a thin layer of water in the lotus paddy fields, 2 to 2.5 kg of ferrous sulfate per mu, and 25 to 30 kg of calcium magnesium phosphate fertilizer are mixed with 40 kg of dry fine soil. Or in the early and middle stage of growth, Huimanfeng 150-200 ml/mu, and 30 kg foliar spray 1 or 2 times.

Boron lotus lack of boron, the leaves are still green, but the veins turn yellow and leaves are small. When there is a serious shortage of boron, the veins are especially the main veins, the embossments are uplifted, the texture is hard and brittle, the stems turn yellow and crunchy in advance, the underground stems become smaller and harder, and the expansion is slow. If the base fertilizer only applies nitrogen and phosphate fertilizer and no boron fertilizer is applied, boron fertilizer should be applied in time from the end of June to the beginning of July. The amount of boron fertilizer applied: 1 to 1.2 kg per mu for severe boron deficiency; 0.8 to 1 kg for moderate boron deficiency; 0.5 to 0.7 kg for light boron deficiency. According to the amount of borax plus 10 kilograms of dry fine soil or dry sand, mix well, and separate compartments from the walk into the field, both sides of the same amount of applicator. Immediately after spreading, mix the topsoil and borax with a long rake, and then keep shallow water until the drainage period before excavation. However, the amount of boron fertilizer is not as good as possible, and the application amount per acre should be strictly controlled at 0.5 to 1.2 kg. If it exceeds 2 kg, boron poisoning symptoms will appear and production will be significantly reduced. The period of applying boron fertilizer should not exceed the first half of July, otherwise the effect is not significant either.

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Product Name Active Ingredient Specification Test Method

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