Large wheat is in the process of growth and development. A variety of nutrients are needed. If there is a certain nutrient element in the soil, the wheat seedlings will show corresponding characteristics from the external form. Therefore, in production, according to the external symptoms of wheat seedlings, look at the disease, the right medicine.
The growth and development of nitrogen-deficient wheat seedlings requires a large amount of nitrogen nutrition when nitrogen is insufficient. The plant grows poorly, the stem is short, the tiller is less, the seedling is weak and erect, the leaf is narrow and short; the stem base leaves yellow, the tip of the leaf is dry, and gradually develops to the upper part, and finally the lower old leaf is dead early. The nitrogen-deficient wheat seedlings have poor growth and the roots are small and slender. Eventually, the spikes are reduced and the yield is reduced. Generally, thin soils are prone to symptoms of nitrogen deficiency. Remedial measures: 7-8 kg of urea per acre or 20 kg of ammonium bicarbonate or 600-700 kg of human excrement. Foliar spray can also be carried out with 1~2% urea solution.
In the absence of phosphorus in phosphorus-deficient wheat, the root growth and development is inhibited, the secondary roots are few, the plants are small, the tillers are few, the leaves are dark green and lack luster, slightly purple, and the leaves are purple. The symptoms range from the tip to the base and from the old leaves. Young leaves develop, cold resistance is poor, wintering is easy to kill seedlings, flowering delay is delayed, pollen formation and fertilization process are affected, grain filling is not normal; resulting in 1000-grain weight drop, poor quality and low yield. Remedial measures: First, the application of superphosphate, generally 25 to 30 kg per mu of calcium superphosphate with water; the second is foliar spray of potassium dihydrogen nitrate, generally 150 to 200 grams per acre of water 75 kg spray .
K-deficient wheat seedlings lack potassium, plant growth is slow, stems are short, leaves are dark green or blue-green, soft and undercoat, leaf tips and edges are yellow, then brown, veins remain green, lower leaves are scorched, severely The leaves are dead. The roots grow poorly, are perishable, the plants are wilting, and they are prone to premature aging. The earlets are small, the seeds are not full, the maturity is early, the quality is poor, and the yield is low. Remedy: (1) Topdressing potassium chloride, generally 7 to 10 kg per acre. (2) Spreading grass ash, generally l00 kg per acre. (3) Foliar spray fertilizer, generally sprayed with water of potassium dihydrogen phosphate l50~200g per acre, continuously sprayed 2~3 times.
In the absence of zinc in zinc-deficient wheat, lobular disease occurs, the leaf margin is distorted or shrunken, and the veins are green to yellow and white on both sides, and the edges are still green, showing yellow, white and green stripes. The heading is late, and the ear is small. Remedy: Foliar application with 0.3~0.4% zinc sulphate solution, spray once every 5~7 days, continuously spray 2~3 times.
The most typical symptom of boron deficiency in boron-deficient wheat seedlings is “spots are not realâ€. The growth period is postponed, sometimes it is divided by the earing, and the sheath is sometimes purple-brown. Remedy: Use 150~200g of borax per acre with water and other fertilizers such as NPK, or use 50~100g per acre for 50~60kg of water for foliar spray.
Calcium-deficient wheat seedlings are deficient in calcium, the growth point and the tip of the stem die, the plants are short or clustered, the young leaves are often unfolded, the roots are short, the branches are many, the root hairs are few, the root tips secrete transparent mucus, and the spheres adhere to the root tip. on. Calcium-deficient leaves also yellow, starting from the young leaves. Remedy: Apply 50-70 kg of lime per acre.
The growth and development of nitrogen-deficient wheat seedlings requires a large amount of nitrogen nutrition when nitrogen is insufficient. The plant grows poorly, the stem is short, the tiller is less, the seedling is weak and erect, the leaf is narrow and short; the stem base leaves yellow, the tip of the leaf is dry, and gradually develops to the upper part, and finally the lower old leaf is dead early. The nitrogen-deficient wheat seedlings have poor growth and the roots are small and slender. Eventually, the spikes are reduced and the yield is reduced. Generally, thin soils are prone to symptoms of nitrogen deficiency. Remedial measures: 7-8 kg of urea per acre or 20 kg of ammonium bicarbonate or 600-700 kg of human excrement. Foliar spray can also be carried out with 1~2% urea solution.
In the absence of phosphorus in phosphorus-deficient wheat, the root growth and development is inhibited, the secondary roots are few, the plants are small, the tillers are few, the leaves are dark green and lack luster, slightly purple, and the leaves are purple. The symptoms range from the tip to the base and from the old leaves. Young leaves develop, cold resistance is poor, wintering is easy to kill seedlings, flowering delay is delayed, pollen formation and fertilization process are affected, grain filling is not normal; resulting in 1000-grain weight drop, poor quality and low yield. Remedial measures: First, the application of superphosphate, generally 25 to 30 kg per mu of calcium superphosphate with water; the second is foliar spray of potassium dihydrogen nitrate, generally 150 to 200 grams per acre of water 75 kg spray .
K-deficient wheat seedlings lack potassium, plant growth is slow, stems are short, leaves are dark green or blue-green, soft and undercoat, leaf tips and edges are yellow, then brown, veins remain green, lower leaves are scorched, severely The leaves are dead. The roots grow poorly, are perishable, the plants are wilting, and they are prone to premature aging. The earlets are small, the seeds are not full, the maturity is early, the quality is poor, and the yield is low. Remedy: (1) Topdressing potassium chloride, generally 7 to 10 kg per acre. (2) Spreading grass ash, generally l00 kg per acre. (3) Foliar spray fertilizer, generally sprayed with water of potassium dihydrogen phosphate l50~200g per acre, continuously sprayed 2~3 times.
In the absence of zinc in zinc-deficient wheat, lobular disease occurs, the leaf margin is distorted or shrunken, and the veins are green to yellow and white on both sides, and the edges are still green, showing yellow, white and green stripes. The heading is late, and the ear is small. Remedy: Foliar application with 0.3~0.4% zinc sulphate solution, spray once every 5~7 days, continuously spray 2~3 times.
The most typical symptom of boron deficiency in boron-deficient wheat seedlings is “spots are not realâ€. The growth period is postponed, sometimes it is divided by the earing, and the sheath is sometimes purple-brown. Remedy: Use 150~200g of borax per acre with water and other fertilizers such as NPK, or use 50~100g per acre for 50~60kg of water for foliar spray.
Calcium-deficient wheat seedlings are deficient in calcium, the growth point and the tip of the stem die, the plants are short or clustered, the young leaves are often unfolded, the roots are short, the branches are many, the root hairs are few, the root tips secrete transparent mucus, and the spheres adhere to the root tip. on. Calcium-deficient leaves also yellow, starting from the young leaves. Remedy: Apply 50-70 kg of lime per acre.
ã€Comment】 ã€Print this article】 ã€Close this page】 ã€Large, medium and small】
Fine Chemicals,Dyclonine Hydrochloride,Pinane Hydroperoxide,Ferrous Oxalate
HENAN BON INDUSTRIAL(CHEMICAL) CO.,LTD , https://www.bonchemical.com