黄褐土、潮土中不同氮素形态配比对烤烟根际土壤微生物数量的影响

试验采用盆栽控雨栽培和根网袋的方法 ,在两种土壤类型上初步研究了不同氮素形态配比与芝麻饼肥互作对烤烟不同生育时期根际土壤微生物数量的影响。结果表明 :在黄褐土中 ,当施入 40 %饼肥、NO-3 ∶NH+ 4为 1∶1时 ,土壤中真菌、氨化细菌和好气性纤维素分解菌数量最多 ,促进根系的生长发育。在潮土中 ,当施入 40 %饼肥、NO-3 :NH+ 4为 3∶1时 ,土壤中好气性纤维素分解菌、氨化细菌在移栽后 3 8天迅速上升 ,促进了根系对氮素的吸收利用

Effect of Different Nitrogen Forms on the Microbial Number in Rhizosphere of Flue-cured Tobacco Planted in Yellow Cinnamon Soil and Fluvo-aquic Soil

A pot experiment with root net was primarily conducted to study on effect of different nitrogen forms mixed with sesame seed cake fertilizer on the microbial number in rhizosphere of different growth stages of flue-cured tobacco. The results showed that different treatments had different effects on microbial numbers in two soils. In yellow cinnamon soil, when 40% cake fertilizer was applied, the ratio of NO - 3 to NH 4 was 1:1, the number of fungi, ammonificator and cellulose-decomposing bacterium was highest, and then the growth and development of root was improved. In fluvo-aquic soil, when 40% cake fertilizer was used, the ratio of NO - 3 to NH 4 was 3:1, the number of ammonificator and cellulose-decomposing bacterium increased afte 38d of transplanting.