Formation Causes of Wheat Varieties and Control Measures

After wheat sowing, due to the influence of natural conditions and cultivation measures, various abnormal color seedlings are often formed. In order to facilitate the management of farmers' friends due to seedlings, the author will introduce them separately as follows:

Yellow leaf seedlings. The first is caused by the soil drought. This situation occurs most often in wheat fields where there is insufficient moisture or wind. The childbirth is born slowly, the leaves are gray-green, the heart is short, and the growth is slow or stagnant (commonly known as "contraction heart seedlings"). The middle and lower leaves gradually turn yellow and dry, and the roots are small and thin. Management combined with watering, topdressing 7-8 kg of urea per acre. The second is caused by soil compaction. Due to lack of gas and lack of gas, the roots are difficult to spread, resulting in short yellow leaves, and the tillers cannot appear on time. Management timely watering, and then cultivating loose soil, remove the rigid layer. The third is caused by nitrogen deficiency. Seedlings are thin and erect, with few tillers and short and narrow leaves. The lower leaves start from the tips of the leaves and gradually turn yellow and dry and develop toward the upper leaves. 7 to 8 kg of urea per mu or 600 to 700 kg of human excreta are used to apply water or water to the ditch. Fourth, the excessive planting volume caused the plants to be thin, thin, weak, malnutrition, competing for light, competing for fertilizer, and competing for water, thus forming yellow weak seedlings. Management must first pay close attention to sparse seedlings, combined with watering, topdressing a small amount of nitrogen and phosphorus available fertilizer, to make up for excessive consumption of soil nutrients, prompting the wheat seedlings from weak to strong. The fifth is caused by pests and diseases.

Wheat worms, red spiders and other pests and diseases can also cause yellow wheat. Insect pests were promptly sprayed with 40% omethoate 1500-2000 times.

Red leaf seedlings are caused by waterlogging. Timely ditch drainage in addition to stains, and topdressing a small amount of available nitrogen fertilizer to promote early-onset seedlings. The second is caused by frost damage. Scratching, ramming soil, roots, 75-100 kilograms of plant ash per acre. The third is caused by the lack of phosphorus in the soil. Combine ploughing and loosing soil, use 20-30 kg of superphosphate per acre to apply irrigation or water to the water between rows. Yellow and white seedlings are caused by lack of zinc in soil. Can be used per gram of zinc sulfate 1 kg of fine soil or organic fertilizer 15 to 20 kilograms, ditch applied in the interline, or with 0.1% to 0.2% of zinc sulfate solution foliar spray. Brown seedlings are generally caused by potassium deficiency, and management uses 15 kg of potassium sulfate or 100 kg of vegetation ash per mu, which is applied in the trenches, or with foliar spraying of 0.2% to 0.3% of potassium dihydrogen phosphate solution. When the purple leaf seedlings are deficient in boron, the stems and leaves are hypertrophied and the leaves are purple. 150-200 grams of borax can be used per acre, and the appropriate amount of nitrogen, phosphate fertilizer with water pouring, or borax 50 ~ 100 grams per acre, 50 ~ 60 kg of water spray on the foliage.

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