南雄烟区土壤调查和微生物分析

为了解广东南雄烟区土壤的退化情况,共调查了8个村的54个农户,种植面积431.2km2,其中包括旱地紫色土103.4km2,牛肝土水田109.4km2,沙泥田水田75.4km2,平均产量为244.4kg/km2。牛肝土水田和紫色土上种植的烟叶质量和产量高,连年种植烟草的沙泥地容易高发青枯病。产量高的地块施肥相对较多,但未呈现正相关关系。采集了土样并进行土壤微生物分析表明,土样间细菌、真菌和固氮菌的种类、数量有很大不同,即可培养微生物群落的差异非常大。烟田种大豆的土壤细菌和固氮菌数量最多。轻发青枯病田块土壤真菌数量最多,但其患青枯病烟杆的根际土真菌数量很少,根际土硝化细菌多。不同土壤固氮菌使碳酸钙溶解的情况也不一样。

Investigation of the tobacco-planting soils and microbiology analysis in Nanxiong district

In order to study the status of soil degradation in the tobacco-planting fields in Nanxiong of Guangdong province, 54 farmers from 8 villages, whom totally planted 431.2 km2 tobacco, were investigated, which involved 103.4 km2 Purple soil, 109.4 km2 Niugantutian soil and 75.4 km2 Shanitian soil, and the average yield was 244.4 kg/km2. The results indicated that the tobacco output and quality were relatively higher in the Niugantutian and Purple soils. The tobaccoes planted in the continuous planting Shaniti...