Abstract:

Filter mud is the solid waste of sugar-making process, and its main research direction is on the industrial production, but there are few studies on sugar-mill filter mud returning to field. To reveal the influence of the application rate of filter mud on the content of alkali-hydrolyzed nitrogen, available phosphorus, available potassium and pH value of soil and sugar yield of different sugar beet varieties (KWS1197, KWS7748, KWS1479 and Beta2730), three treatments were set up: no filter mud (CK), the filter mud application rate of 3750 kg/hm² (A1) and 7500 kg/hm² (A2). By analyzing the effects of soil nitrogen, phosphorus, potassium and pH value on sugar beet yield, it is showed that the most suitable application rate of filter mud for KWS7748 (high-yield type) is 3750 kg/hm², which could increase not only the root yield of sugar beet, but also the sugar content. The most suitable application rate of filter mud for KWS1497 (standard type), KWS1179 (high-sugar type) and Beta2730 (standard type) is 7500 kg/hm², which could achieve the effect of yield increase. In conclusion, the application amounts of filter mud could have different effects on soil N, P, K and pH value, and the yield of sugar beet of different varieties.

Key words: sugar beet, filter mud, alkali-hydrolyzed nitrogen, available phosphorus, available potassium, pH value, sugar yield