设施菜地休闲期施用石灰氮防控根结线虫对土壤pH及微生物量的影响

为了研究设施菜地施用石灰氮对土壤生化性质的影响，通过设施蔬菜大棚休闲期撒施石灰氮防治根结线虫后，研究了其对芹菜土壤pH及微生物量的影响。结果表明：施用石灰氮后，石灰氮处理芹菜根际土壤的pH高于对照处理，但均显著低于相应非根际土壤的pH；在对照和石灰氮处理中除石灰氮处理的真菌数外，其余根际土壤细菌、真菌、放线菌数量都高于非根际土壤，差异都达到了显著水平（P<0.05）。在施用石灰氮后，芹菜根际土壤的细菌、放线菌数量分别较对照根际土壤增加了100%和65%，同时根际土壤的放线菌数量/真菌数量(A/F)和细菌数量/真菌数量(B/F)值显著增加。对照处理根际土壤的B/F，A/F值较非根际土壤有所增加，但差异不显著；石灰氮处理的根际土壤中微生物总数量高于对照处理根际土，差异达显著水平。两个处理的根际土壤中微生物总数量也显著多于非根际土；施用石灰氮后，芹菜根际土壤的脲酶活性较非根际土壤、对照处理的根际与非根际土壤分别高出18.5%、49.2%、25.4%；芹菜的根系活力较对照高出了104%，同时也显著提高了芹菜的产量，增产达到22.7%。结果证实了施用石灰氮能够改善感染根结线虫根际土壤的生化性状。

Effect of Application of Calcium Cyanamid on Soil pH and Microbial Biomass in Vegetable Greenhouse Infected by Root-knot Nematode in Fallow Season

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 calc...