Abstract:

To provide the sugar mill with a comprehensive utilization method of filter mud, with the beet variety ‘H004’ as the experimental material, we studied the effects of beet filter mud on soil physicochemical properties, growth indexes, chlorophyll content, antioxidant enzymes and osmotic regulatory substances of beet seedlings by applying sugar mill filter mud equivalent to 1%, 3% and 5% of the dry weight of acid soil. The results showed that: with the increase of the proportion of filter mud applied, the soil pH gradually increased, and the content of available nitrogen, phosphorus and potassium gradually increased; the plant height, leaf width, leaf weight and stem weight of beet all increased gradually, and chlorophyll content of beet plants also increased gradually; the activities of catalase and peroxidase as well as the contents of proline, soluble sugar, soluble protein, reducing sugar and free amino acid all increased with the increase of the proportion of filter mud. Applying filter mud can improve the pH of acidic soil, and increase the content of available nitrogen, available phosphorus and available potassium in soil. Taking filter mud from sugar mill as soil improvement agent can not only improve the soil fertility and promote the growth of sugar beet, but also solve the problem of filter mud pollution and reduce the waste of resources to further protect the environment, which is of great economic and ecological significance.

Key words: beet filter mud, sugar beet, acidic soil, antioxidant system, osmotic regulatory system, soil nutrients