控释掺混肥对大蒜根际土壤微生物的影响

通过大田试验系统研究了控释掺混肥对大蒜根际土壤微生物数量的变化。结果显示：（1）大蒜根际土壤中细菌、放线菌数量和微生物总量随控释掺混肥施入量的增加而增多，而真菌数量减少。控释掺混肥与习惯施肥（CCF）相比，等量（CRF1）和减量20％（CRF2）时大蒜根际土壤中细菌、放线菌数量和微生物总量极显著地高于CCF，真菌数量极显著地低于CCF。（2）CRF1和CRF2处理土壤生理功能微生物（自生固氮菌、氨化细菌、硝化细菌和纤维素分解菌）的数量不仅显著高于不施肥处理，而且还显著高于CCF，60%控释掺混肥用量处理（CRF3）略低于CCF，但差异不显著。研究表明控释掺混肥可通过促进细菌、放线菌和生理功能微生物的繁殖来提高土壤速效养分含量，进而提高大蒜鳞茎产量。

Effects of controlled-release bulk blending fertilizer application on rhizosphere soil microorganisms

A field-trail experiment was carried out to investigate the effects of single basal application of controlled-release bulk blending fertilizer (CRF) on rhizosphere soil microorganism. The main results are as follows: (1) Bacteria, Actinomyces and total microbial population in rhizosphere increased with the increasing of application of CRF, but Fungi population was opposite. Compared to CCF, 100% and 80% CRF treatment could increase Bacteria, Actinomyces and total microbial population in rhizosphere significantly, and decrease Fungi population significantly. (2) Nitrogen-fixing bacteria, ammonifers, nitrifying bacteria and cellulose decomposing bacteria population under CRF1 and CRF2 were significantly higher than CCF. CRF3 treatment was lower than CCF, but the difference was no significant. All these indicated that CRF application could increase soluble nutrients contents in soil by improvements of Bacteria and Actinomyces and microorganisms that have physiological functions reproduction, therefore, the garlic yield was increased.