What is the reason of wheat yellow seedling?
Rough yellow seedling. If the soil is not fine, more soil bulk soil, soil loose, root is not good, resulting in slow growth, reduced heart, wheat yellow, weak seedling.
Two, fat burning yellow seedlings. Because of no fertilizer maturity, seed fertilizer (fertilizer, fertilizer) applied too much, their seeds and seedlings exposed to these fertilizer is easy to burn, causing the blade tip or yellow.
Three, phytotoxicity yellow seedlings. If the concentration of pesticide seed is too large, the root enlargement caused by yellow seedling injury.
Four, too dense yellow seedlings. Earlier, a large amount of seed sowing wheat seedling growth often appears excessive, the density is too large, because the wheat with poor nutrition, dysplasia and yellow.
Five, lack of fertilizer yellow seedlings. When sowing could apply fertilizer or fertilizer is insufficient, then no timely fertilizer, wheat due to the long-term lack of fertilizer and yellow.
Six, drought yellow seedlings. Due to the lack of dry weather or soil moisture, wheat water difficulties resulting in slow growth, grey green leaf, not long, the basal leaf yellowing, secondary root, tillering difficult.
Seven, waterlogging yellow seedlings. Some low-lying, poorly drained farmland ditching, as in waterlogged condition for a long time, slowing the decomposition of organic matter, nutrients can not be absorbed, resulting in wheat yellow leaf, slow growth, root growth retarded, shallow rooted, there will be a serious phenomenon of dead seedling rot.
Eight, pest yellow seedlings. The wheat aphid and wheat spider from leaf juice caused by yellow leaves; the pest mole crickets, bite the wheat root wireworm etc., the yellow leaves, stems and roots caused serious direct cut off seedlings.
Nine. Yellow seedling of disease. Sheath blight, rust, and other hazards can cause all disease of wheat yellow weak.
Ten, chilling injury, yellow seedling. If the cold wave is cool after wheat emergence, the cold damage is easy to occur. Tender tip, blade tip suddenly yellow and uniform; or part of the blade tissue injuries, like boiling hot water, and then gradually withered.
Eleven, salt damage yellow seedlings. When soil salinity is high, the wheat plants are usually short and thin, with little tillering, narrow leaves, yellow leaves at the base, yellow green leaves and purplish red leaves.
How should the Yellow seedling be prevented and cured?
Rough yellow seedling prevention measures: early crushing, covering soil, watering, fine hoe.
Fertilizer burning yellow seedlings prevention measures: can be water remediation, water 1 times a day, even for a few days.
The phytotoxicity of yellow seedling prevention measures: such as the problem is not serious, not treatment, until the root grow naturally, wheat yellow from green. If the problem is serious, water treatment should be done and the soil should be ground after pouring.
Dense yellow seedling prevention measures: the soil pressure on the one hand, to slow the growth and grow strong; on the other hand to deep root, increase the tiller and tiller control small excessive growth, conducive to seedling. At the same time, attention should be paid to timely planting seedlings, suitable for Topdressing and, if necessary, Paclobutrazol control.
The prevention measures of yellow seedlings are: the earlier the winter, the sooner the better. Generally, 25~30 kg of ammonium bicarbonate and 15~20 kg of phosphate fertilizer are applied per mu, so as to promote early tillering and early to take root.
Dry yellow seedling prevention measures: timely watering and fertilizing, promote seedling growth, seedling tiller number of normal.
Prevention measures of yellow seedlings: do drainage work immediately, dredge drainage ditch in field, lower groundwater level, and then add appropriate amount of available nitrogen fertilizer and phosphorus and potassium fertilizer to promote normal growth.
Pest control measures: 1. 40% Omethoate can be used per acre, 65~75 ml of water, 50 kg of water spray control; II. 50% phoxim EC or 40% methyl EC EC 1000 times liquid root.
Prevention measures of yellow seedling: take chemical control in time. Can use 20% mu of rice sheath blight Triadimefon three EC 150 grams, or 5% Jinggangmeisu water 150~200 grams, or 50% carbendazim wettable powder 50~75 grams, about 50~75 kg of water spraying; to rust by 15% Triadimefon three WP 1000 times liquid spraying; to take all disease per mu 15% three Triadimefon EC 150~200 grams, 50~60 kg of water spraying.
Prevention measures of cold damage yellow seedling: timely watering before cold arrival, strengthening management after cold current, spraying foliar fertilizer.
Salt yellow seedling prevention measures: timely intertill loosen the soil, reduce the surface evaporation, prevent salt, local conditions, can be used through irrigation or ditching salt drainage method, reduce soil salinity.
