关键词: 高粱, 土壤酶活性, 微生物菌剂, 生长

Abstract: In order to reveal the effect of microbial fertilizer application on the improvement of saline-alkali land, and effectively reuse organic waste resources, this paper studied the changes of soil invertase and phosphatase activities and their effects on the growth of sorghum in different growth stages of sorghum. The results showed that:  microbial agent could improve  the activity of soil sucrase, phosphatase, among which T5, T6 had the greatest influence on urease. The soil urease activity in sorghum seedling stage, jointing stage, heading stage and maturity were  1.441, 1.495, and 1.407 and 1.379 mg·g^-1·d^-1, significantly higher than other processing. The effects of each treatment on soil urease at the jointing stage of sorghum were T5>T6>T1>T4>T2>T3>CK; the effects of different treatments on urease activity in different growth stages of sorghum were jointing stage>heading stage>seedling stage>mature stage, which indicated that suitable microbial agents increased soil sucrose and soil phosphatase activity, effectively improved soil fertility, and then improved crop nitrogen use in soil. With the promotion of growth period, the activity of soil phosphatase decreased firstly and then increased. The soil phosphatase activity of T5 was significantly higher than that in other treatments, secondly was T6. The outstanding performances of T5 and T6 were the salt-tolerant strains screened in the early stage, which could improve the geographical traits of salinity and lay a theoretical foundation for further improvement of saline-alkali soil.

Key words: sorghum, soil enzyme activity, microbial agents, growth