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在宜城市和枣阳市开展控氮增钾控制小麦病害发生的试验研究。结果表明,合理控施氮肥和增施钾肥,可控制小麦病害的发生,收到增产、增收的效果。田间所施氮肥量与病害之间呈正相关关系。当所施纯氮在0～20kg/667m2之间时,随着施用量的增加,病害发生和为害呈上升加重趋势。根据收益分析,在小麦生长的全生育期内,田间每667m2施纯氮10～12.5kg较适宜。增施钾肥不仅能延迟小麦条锈病的始见期,还能明显降低条锈病、纹枯病、赤霉病等的发生程度,减轻其为害。同时,适量增施钾肥还能增加小麦千粒重,提高小麦产量。在每667m2施10kg纯氮和5kg纯磷的情况下,以施纯钾肥11kg产量最高。
Experimental Study on the Control of Wheat Disease by Control of Nitrogen and Potassium in Yicheng City and Zaoyang City. The results showed that the reasonable control of nitrogen fertilizer and potassium fertilizer could control the occurrence of wheat diseases and received the effect of increasing yield and increasing income. There was a positive correlation between the amount of nitrogen fertilizer applied and the disease in the field. When the applied nitrogen was between 0 ~ 20kg / 667m2, with the increase of application rate, the occurrence of disease and the damage tended to increase. According to the yield analysis, during the whole growth period of wheat growth, applying 10 ~ 12.5kg pure nitrogen per 667m2 field is more suitable. Increasing potassium fertilizer not only delayed the initial stage of wheat stripe rust, but also significantly reduced the incidence of stripe rust, sheath blight and scab, reducing its damage. At the same time, an appropriate amount of potassium fertilizer can increase 1000-grain weight and improve wheat yield. In each 667m2 application of 10kg of pure nitrogen and 5kg of pure phosphorus in the case of Shi Chun Shi 11kg yield the highest.