The main reasons for these phenomena are as follows: First, waterlogging. Due to low altitude, poor drainage, high groundwater level, long-term waterlogging in wheat fields, soil organic matter decomposition is slow, nutrients can not be absorbed by wheat seedlings in time, coupled with poor development of roots after waterlogging, shallow rooting, poor absorption, and then cause yellow Seedlings, even rotten root dead phenomenon. In this regard, it is necessary to clear the ditch in time to reduce the groundwater level, and to apply appropriate amount of compound fertilizer to promote the recovery of wheat. The second is root rot. Root rot caused by fungal infection, wheat seedling stage disease, buds and roots become brown and even rot. In severe cases, young shoots can not be exhumed and withered; wheat is susceptible to disease during rooting, brown spots appear in roots and stems, brown rot occurs in leaf sheaths. Severe seedlings can cause death. This type of disease occurs when the soil is too dry or wet, and the seedlings become sicker when they are frozen. The degree of occurrence of root rot is affected by many factors, such as soil compaction, overburdening when sowing, and wheat seedlings, which can be controlled through chemical seed dressing. Before sowing, use 50% acetaminophen WP or 50% thiram WP, 20% triadimefon EC, according to seed weight of 0.2% to 0.3% seed dressing.
Stainless Steel Endoscope Cabinet
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