Abstract:

In order to study the effect of Calcium Cyanamid on soil biological and chemical character, Calcium Cyanamid was applied to soil infected by root-knot nematode in vegetable greenhouse planted celery, the effect on soil pH and soil microbial biomass was studied. The results showed that after application of Calcium Cyanamid, non-rhizosphere soil pH values increased significantly and the rhizosphere soil pH values in both treatments were lower than the non-rhizosphere. The rhizosphere soil pH values of applied Calcium Cyanamid celery were higher than that of CK, but lower than that in non-rhizosphere soil of CK. In treatments, in addition to fungi in applied Calcium Cyanamid soil, the other rhizosphere soil bacteria, fungi and actinomyce numbers were greatly more than that in non-rhizosphere soil, the level of the difference was significant (P<0.05). Application of Calcium Cyanamid, the bacteria and actinomyce number in celery rhizosphere soil increased by 100% and 65% respectively compared with CK. It also made B/F, A/F value of celery rhizosphere soil extraordinary improve. Although B/F, A/F value of celery rhizosphere soil had some higher than that in non-rhizosphere soil, the difference was not significant. In both treatments, total microbe number in rhizosphere soil was more than that in non-rhizosphere soil. The total microbe number in applied Calcium Cyanamid soil was distinguished higher than that in CK. After the application of Calcium Cyanamid, urease activity in celery rhizosphere soil was higher than that in non-rhizosphere soil, control treatment rhizosphere and non-rhizosphere soil by 18.5%, 49.2%, 25.4%, respectively. The root activity was 104% higher than the control, and the yield of celery significantly increased, more by 22.7%. As a result, this paper had demonstrated that applied Calcium Cyanamid in soil infected by root-knot nematode could improve soil biological and chemical character in vegetable greenhouse.