桂阳烟区土壤有效硼分布特征及其对烟叶硼和主要含氮化合物含量的影响

以桂阳烟区土壤和烟叶样品为材料,采用多元统计学方法研究桂阳烟区土壤有效硼的含量、分布特征、主要影响因素及其对烟叶硼和主要含氮化合物含量的影响,为桂阳烟区合理施用硼肥和提升烟叶品质提供理论依据。结果表明,桂阳烟区土壤有效硼含量适宜,有效硼含量不足区域占比较低,仅为4.27%,地区间差异显著;土壤有效硼含量随pH的升高表现为先升高后降低的趋势,随有机质含量的升高而升高;随着土壤有效硼含量的升高,烟叶硼含量逐渐升高,蛋白质和总氨基酸含量表现为先升高后降低的趋势,烟碱含量表现为先降低后升高的趋势。土壤pH和有机质含量的高低均会不同程度地影响土壤有效硼含量,进而影响烟叶硼和主要含氮化合物的含量。

Distribution Characteristics of Soil Available Boron in Guiyang Tobacco Area and Its Effects on the Boron and Main Nitrogen-Containing Compounds Contents of Tobacco Leaves

Using soil and tobacco samples in Guiyang tobacco area as materials, the distribution characteristics of soil available boron content in Guiyang tobacco area, main influencing factors, and the effects on the content of boron and main nitrogen-containing compounds in the soil of Guiyang tobacco area were studied by multivariate statistical methods for providing a theoretical basis for the rational application of boron fertilizer and the improvement of tobacco leaf quality in Guiyang tobacco area. The results showed that the soil available boron content in Guiyang tobacco area was adequate and the area with insufficient available was relatively low, only 4.27%, and there were significant differences between regions. The soil available boron content increased first and then decreased with the increase of pH and increased with the increase of organic matter content. With the increase of soil available boron content, the boron content of tobacco leaves gradually increased, the protein and total amino acid content increased first and then decreased, and the nicotine content decreased first and then increased. Soil pH and organic matter content affected the soil available boron content with varying degrees which in turn affected the content of boron and main nitrogen compounds in tobacco leaves.