Wheat is a tillering crop, and its growth after turning green is mainly affected by the level of soil fertility, basal fertilizer application and climate change. If "Wang Miao" is caused by high soil fertility or sufficient amount of base fertilizer, it can be postponed to the rising and jointing stage and then topdressing, and the amount of topdressing should be appropriately reduced; if "Wang Miao" is caused by late sowing and high population density, and The leaf color is yellow, top dressing should be postponed to the jointing stage, but the amount of fertilizer cannot be reduced. At this time, the first to second internodes of wheat are basically fixed, and the risk of lodging is small.
If the soil fertility is low, the base fertilizer is insufficient, and the seedlings are small and sparse, topdressing can be done when the soil has just melted and the wheat seedlings are turning green, and the appropriate amount of water should be irrigated and topdressing 5-10 kg of urea or 15-25 kg of ammonium bicarbonate per acre until jointing Period to apply again. But pay attention to the amount of irrigation water can not be large, because this period is just slow seedlings, the water demand is small, too much water will reduce the soil temperature, but it is not conducive to wheat growth.
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