烟草的根对亚硝酸盐极为敏感,甚至在通气良好的生长介质中也是如此.因此,在烟草移植后几周内的连续降雨会导致其生长失调,通称为有机质毒害.众所周知,在缺氧的土壤里,硝酸盐与有机质结合会导致亚硝酸盐的积聚;即当土壤中的水分含量接近田间持水量时,由于氧气扩散缓慢,因此有机质的腐解会耗尽土壤中的氧气,从而利于亚硝酸盐的积聚.试验目的在于研究施用有机质与氮肥时土壤中亚硝酸盐的积聚,以及亚硝酸盐对烟草的毒性. Tobacco roots are extremely sensitive to nitrite, even in well-ventilated growth media, and therefore, continuous rains within a few weeks after tobacco transplant can lead to their dysregulation, commonly known as organic toxicity. It is well known that in hypoxic Soil, nitrate and organic matter will lead to the accumulation of nitrite; that is, when the soil moisture content close to the field water, due to the slow diffusion of oxygen, the decomposition of organic matter will be depleted of oxygen in the soil, which will help Asia Nitrate Accumulation The purpose of the experiment was to investigate the accumulation of nitrite in soils with organic matter and nitrogen and the toxicity of nitrite to tobacco.