豫中烟区中高肥力条件下NC297配套施肥试验

通过大田试验的方法,研究豫中烟区中高肥力条件下NC297适宜的施氮量和氮、磷、钾配比.结果表明,烟株长势和产值随施氮量的增加而增强,增施磷、钾在一定程度上也使烟株长势增强；在低钾处理条件下,尤其是高氮处理时,NC297表现出明显的缺钾症状；随着施氮量增加,成熟度、结构和油分有下降趋势,叶片厚度增加.总体上以施氮量37.5 kg/hm2处理外观质量较好；随施氮量的增加,感官质量呈下降趋势,施氮量37.5 kg/hm2,氮、磷、钾配比为1.0∶2.2∶4.0时烟叶感官质量最好,但相同氮量,氮、磷、钾配比为1.0∶1.6∶3.0时产量、产值和烟叶化学成分协调性都要好于前者,同时,后者感官质量也相对较好.综合分析,在豫中地区中高肥力烟田种植NC297时,建议氮施用量为37.5 kg/hm2,氮、磷、钾比例为1.0∶1.6～2.2∶3.0～4.0.

Research on Fertilization of NC297 in Meddle-high Fertility Tobacco Areas of Central Henan

Through the field test method,the appropriate amount of nitrogen and NPK ratio of NC297 in meddle-high fertility tobacco areas of central Henan were studied.The results showed that the growth of tobacco plants,quantity and value increased with the application of nitrogen;and the growth of tobacco plants were enhanced when applying P and K to some extent.Under low potassium application conditions,NC297 showed significant potassium deficiency symptoms,especially when the application amount of nitrogen was high.There were some downward trends in leaf maturity,structure,and oil,but increase of blade thickness when increasing the application of nitrogen.Overall,when the application amount of nitrogen was 37.5 kg/hm2,the appearance of tobacco was better.At the same nitrogen amount,tobacco sensory quality was the best when the ratio of NPK was 1.0∶2.2∶4.0;but quantity,value and chemical composition of tobacco should be better when NPK ratio was 1.0∶1.6∶3.0.In all,37.5 kg/hm2 of nitrogen fertilizer and 1.0∶1.6～2.2∶3.0～4.0 of NPK ratio were recommended when planting NC297 in tobacco fields with middle-high fertility of Central Henan.