Diagnosis and Prevention of Yellowing of Wheat Seedlings

When wheat enters the tillering stage, yellowing of the wheat seedlings often occurs. In the recent investigation of the seedlings in the countryside, regardless of the hills, plains, or dryland or paddy fields, wheat seedlings have different degrees of yellowing symptoms. Although they are only spotted, they must not be negligent. Because, the yellowing of wheat seedlings will inhibit the delivery, the second will reduce the number of basic seedlings and the total number of seedlings, the third will affect the early emergence of strong seedlings, weakening the basis of high wheat yield. The reasons for the yellowing of the wheat seedlings were analyzed. First, the roots and stems of the wheat seedlings were bitten into filaments. The channels they took separated the wheat roots from the soil. The lighter leaves were yellowed and the dead ones were dead. The second was Maiyuan spider infestation, the insect sucking leaf tissue juice, leaves were yellow-white spots, yellow leaves, the victims of heavy cause dry dead seedlings; Third, without applying base fertilizer, wheat seedlings slender chlorosis, tip yellow; four is low Concave waterlogged wheat field, the roots of the seedlings have evolved dark, the ground part is stiff but not hair, and the leaves are yellow. In order to ensure full seedlings, speed up tillering, promote transformation of wheat seedlings, and ensure that young seedlings thrive in winter, the following countermeasures must be taken in current management. Timely control of insect pests For seedlings that have been damaged by fleas, 50% phoxim EC can be used 1000 times, 10% quizal EC 1000 times, 90% crystal trichlorfon 1000 times, and 10% imidacloprid can be 1000 times wettable. The liquid was irrigated around the damaged wheat seedlings. For the round spiders that have been harmed, we must remove the egg source by cultivating and weeding, and prevent and control the reoccurrence of diseases. Second, we must use different pesticides to spray and kill according to local conditions. The available agents are 0.3-degree lime sulfur and 15% dioxins 2000 times. 20% of konjac wettable powder 3000-4000 times, 50% of stuck calcium 1000 times, 50% of tetrahedron suspension 5000 times, 20% of tetrazolium suspension 2000 times. Early application of Miaomiao for rice in the paddy field, due to rushing the season too late to apply base fertilizer, should be applied as soon as possible after the application of available nitrogen fertilizer to raise seedlings, ammonium bicarbonate can be applied 25-30 kg per mu, or urine wheat 8-12 kg. For pests caused by yellow wheat seedlings, roots should be sprayed to restore the growth of seedlings, per acre can be sprayed with 1% urea solution 50 kg, separated by 7-10 days and then spray once. Drain the trenches thoroughly: For the low-lying fields, or the fields where the fields perform, thoroughly clean up the trenches in the fields, and often rectify the silt between the trenches, so that the speed of the open water, the speed of the dark water, and the promotion of wheat Root hair, accelerate the growth process of wheat seedlings.

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