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一、前言烟草是需钾的作物,尽人皆知,但烟草如何经济有效的施用钾肥,尚缺乏较详细的报道,且硫酸钾多为进口,有时供应不及时,造成烟草适时施用的困难;同时,在轮作制中,一般平原区采用小麦——玉米——小麦——红薯——烟的轮作方式,丘陵区采用小麦——谷子——烟或春薯——烟的方式,由于烟接茬在粮食作物之后,粮食作物施用大量氮肥,钾肥很少施用,致使土壤中出现氮、磷、钾的含量失调,影响烟叶品质。为此开展了以提高烟叶品质,施用钾肥的技术研究。
I. INTRODUCTION Tobacco is a crop requiring potassium, and it is well known that how to apply potassium fertilizer economically and efficiently is still lacking in more detailed reports. In addition, potassium sulfate is mostly imported and sometimes not supplied in time, resulting in difficulties in timely application of tobacco. At the same time, In the crop rotation system, wheat-corn-wheat-sweet potato-tobacco rotations are generally used in plain areas, and wheat-millet-tobacco or spring potato-tobacco is used in hilly areas. Afterwards, a large amount of nitrogen fertilizer is applied to the grain crops, and the application of potassium fertilizer is seldom applied, resulting in the imbalance of nitrogen, phosphorus and potassium content in the soil and the quality of the tobacco leaf. To this end to carry out to improve the quality of tobacco, potassium fertilizer technology research.