First, zinc deficiency. Starting from the first true leaf, the young leaves are bronzed, and the veins are obviously chlorotic, thicker, brittle and brittle. The leaf edge curls upwards. The leaves are shortened, the plants are short and clumpy, the growth is blocked, the bells are delayed, and the buds are easy to fall off. Symptoms are prone to occur on old leaves during flowering and bolling. Inducing conditions: The application of phosphate fertilizer is large, and the application of excessive nitrogen fertilizer will lead to the shortage of effective zinc in the soil. Remedy: It can be sprayed once in the seedling stage and the bud stage by using imported 70% Hefeng zinc "3000 times liquid, or 25% power zinc 1000 times liquid.
Second, the deficiency of boron in the seedling stage, bud period is the performance, mainly the thickening of the leaves, become brittle, dark green dull, the main stem growth point is damaged, axillary buds clustered, the upper leaves atrophy. It was severely shed during the bud-bell period, "buds are not flowers", and flowering is difficult to become peach, but the disease first appeared on the leaves. In the case of potential boron deficiency, there may be a link on the petiole. Symptoms are prone to occur in buds to flowering new tissue. Induced conditions: soil with less organic matter, sandy soil, soil with poor water retention and water retention, and long-term persistent drought and excessive rain, easy to induce boron deficiency. Remedy: A single boron fertilizer such as 20.5% Suile Boron and 20.5% Power Boron 1000 times solution can be sprayed once in the bud stage, the initial flowering stage and the flowering and boll period.
III. Manganese deficiency The young leaves first appear thick and greenish stripes between the veins, and the middle of the leaves is more obvious than the tip of the leaves. The tip of the leaf is light green at first, and some small patches are present in the white stripe. Later, the strips of dry tissue are connected and the leaves are longitudinally split. Symptoms are likely to occur in the upper part of the bud and in the upper part of the flowering plant and in the young leaves. Inducing conditions: The soil with a pH >7, large sand content and low organic matter content has low effective manganese content, and too much rainwater is easy to leaching. Remedy: Use manganese nitrate (Mn) foliar fertilizer such as 0.2% manganese sulfate solution, or 800 times potassium permanganate or 600 times "cotton disease resistance increase production king", in seedling stage, early flowering stage, flowering and boll stage Spray once.
4. Molybdenum deficiency The old leaves are chlorotic, the plants are short, the leaves are curled, the leaves are deformed, and they are dry and fall off. Sometimes it causes symptoms of nitrogen deficiency, buds, flowers fall off, and premature aging of plants. Symptoms are prone to occur in the new tissue of the plant from seedling to bud. Induced conditions: a large amount of phosphate fertilizer, sulfur-containing fertilizer or manganese fertilizer. Remedy: Spray with 0.05% to 0.1% ammonium molybdate solution for 2 to 3 times, or use foliar fertilizer containing molybdenum (Mo) such as "cotton disease resistance to increase production".
5. Copper deficiency The plants are short and chlorotic, and the tops of the plants are sometimes clustered. In severe cases, the top ends die. Moreover, copper deficiency in copper is susceptible to various diseases. Symptoms are prone to occur in new tissue of plants. Inducing conditions: low organic matter content, alkaline soil, and reduced effectiveness of copper; excessive application of nitrogen fertilizer can also cause copper deficiency. Remedy: Foliar application, 0.02% copper sulphate, or 600 times of "cotton disease-resistant production king" and other copper-containing (Cu) foliar fertilizer, sprayed once at the seedling stage and before flowering.
Sixth, iron deficiency manifested as "greenness", at the beginning of the young leaves veins chlorotic, the veins remain green, and then completely chlorotic, sometimes the entire leaves are yellow-white. The stalks are short and thin, and many new leaves are chlorotic, and the old leaves can still remain green. Symptoms are prone to sub-new leaves. Induced conditions: the content of phosphorus, zinc, manganese and copper in the soil is too high, the potassium content is too low, the soil is sticky, the water saturation is high, and the use of nitrate nitrogen fertilizer will aggravate iron deficiency. Remedy: 600 times of "green chlorophyll" and other iron (Fe) leaf surface fertilizer can be sprayed.
Second, the deficiency of boron in the seedling stage, bud period is the performance, mainly the thickening of the leaves, become brittle, dark green dull, the main stem growth point is damaged, axillary buds clustered, the upper leaves atrophy. It was severely shed during the bud-bell period, "buds are not flowers", and flowering is difficult to become peach, but the disease first appeared on the leaves. In the case of potential boron deficiency, there may be a link on the petiole. Symptoms are prone to occur in buds to flowering new tissue. Induced conditions: soil with less organic matter, sandy soil, soil with poor water retention and water retention, and long-term persistent drought and excessive rain, easy to induce boron deficiency. Remedy: A single boron fertilizer such as 20.5% Suile Boron and 20.5% Power Boron 1000 times solution can be sprayed once in the bud stage, the initial flowering stage and the flowering and boll period.
III. Manganese deficiency The young leaves first appear thick and greenish stripes between the veins, and the middle of the leaves is more obvious than the tip of the leaves. The tip of the leaf is light green at first, and some small patches are present in the white stripe. Later, the strips of dry tissue are connected and the leaves are longitudinally split. Symptoms are likely to occur in the upper part of the bud and in the upper part of the flowering plant and in the young leaves. Inducing conditions: The soil with a pH >7, large sand content and low organic matter content has low effective manganese content, and too much rainwater is easy to leaching. Remedy: Use manganese nitrate (Mn) foliar fertilizer such as 0.2% manganese sulfate solution, or 800 times potassium permanganate or 600 times "cotton disease resistance increase production king", in seedling stage, early flowering stage, flowering and boll stage Spray once.
4. Molybdenum deficiency The old leaves are chlorotic, the plants are short, the leaves are curled, the leaves are deformed, and they are dry and fall off. Sometimes it causes symptoms of nitrogen deficiency, buds, flowers fall off, and premature aging of plants. Symptoms are prone to occur in the new tissue of the plant from seedling to bud. Induced conditions: a large amount of phosphate fertilizer, sulfur-containing fertilizer or manganese fertilizer. Remedy: Spray with 0.05% to 0.1% ammonium molybdate solution for 2 to 3 times, or use foliar fertilizer containing molybdenum (Mo) such as "cotton disease resistance to increase production".
5. Copper deficiency The plants are short and chlorotic, and the tops of the plants are sometimes clustered. In severe cases, the top ends die. Moreover, copper deficiency in copper is susceptible to various diseases. Symptoms are prone to occur in new tissue of plants. Inducing conditions: low organic matter content, alkaline soil, and reduced effectiveness of copper; excessive application of nitrogen fertilizer can also cause copper deficiency. Remedy: Foliar application, 0.02% copper sulphate, or 600 times of "cotton disease-resistant production king" and other copper-containing (Cu) foliar fertilizer, sprayed once at the seedling stage and before flowering.
Sixth, iron deficiency manifested as "greenness", at the beginning of the young leaves veins chlorotic, the veins remain green, and then completely chlorotic, sometimes the entire leaves are yellow-white. The stalks are short and thin, and many new leaves are chlorotic, and the old leaves can still remain green. Symptoms are prone to sub-new leaves. Induced conditions: the content of phosphorus, zinc, manganese and copper in the soil is too high, the potassium content is too low, the soil is sticky, the water saturation is high, and the use of nitrate nitrogen fertilizer will aggravate iron deficiency. Remedy: 600 times of "green chlorophyll" and other iron (Fe) leaf surface fertilizer can be sprayed.
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