在淹水条件下,土壤中有机物质嫌气分解所积累的产物,对水稻的生长具有毒害作用。在这些嫌气性分解产物中,明显地能够观察到的是一些低碳一羧基的脂肪酸,如甲酸、乙酸、丙酸、丁酸和乳酸造成的危害。有机酸的毒害作用取块于酸的种类,及其浓度。在一羧基的脂肪酸中,随着酸的分子量的增加,对水稻幼苗的毒害作用也随之加剧 Under flooding conditions, the products accumulated by anaerobic digestion of organic matter in the soil have a toxic effect on the growth of rice. Among these anaerobic digestion products, it is clearly observable that some low carbon-carboxyl fatty acids such as formic acid, acetic acid, propionic acid, butyric acid and lactic acid cause harm. Toxicity of organic acids take the type of block acid, and its concentration. In a carboxyl-based fatty acids, with the increase of the molecular weight of the acid, the toxic effect on rice seedlings will also be aggravated