| The leftovers after stevioside extraction is difficult to decompose in a short time, and long-term stacking is easy to cause pollution to the environment. There are a lot of granular stalks in stevia leftovers, which need to decompose at high temperature for a long time; the density of waste mud is large and the effect of ventilation is poor; waste residue and waste mud seriously restrict resource utilization of leftovers. In order to reduce the pollution and realize the efficient use of resources, the resource utilization research of the stevia extract was carried out, and the possibility of using the waste residue and mud solid fermentation as a substrate for farmland production and improving saline soil was explored. Different proportions of solid stocks were set for fermentation, and the characteristics of the pile, temperature and moisture changes, fermented maturity, etc. during the fermentation process were determined, and the finished salt soil field test was carried out to determine the physiological indexes such as aboveground fresh weight and underground fresh weight of green pepper under different application amount.The results showed that the upper limit of stacking solid fermentation temperature was 60℃. Compared with other treatments, 1∶1 stevia leftovers and frame mud + chicken manure treatment (T3) had faster temperature rise, longer high temperature maintenance time, lower water content of substrate at the end of fermentation, higher humic acid maturity and stronger microbial activity. 1∶1 stevioside and plate-frame mud + chicken manure ratio could enhance root activity and significantly promote plant height and leaf area growth. Applying 5 000 kg of new organic fertilizer per 667 m2 of farmland has the best salt-reducing effect and the best crop quality. The test results could be used as the basis for the resource utilization of stevioside, which providing a theoretical basis for the rapid consumption of solid waste generated in the production of the enterprise and a new idea for the study of the new salt soil improvement base. |
