lean soil

The composition and vertical distribution profile of microbes in different tobacco growing soils ( lean moisture soil from Xiangcheng, Henan Province and rich yellow soil from Xingshan, Hubei Province) were studied.

利用不同肥力土壤（低肥潮土和高肥黄壤，分别取自河南襄城和湖北兴山），研究了正常生产管理条件下烟田土壤微生物的组成及垂直分布特征。

The sludge could improve soil fertility and be used to amend lean soil.

污泥的施用还增加了土壤中营养物质的含量，能够改良贫瘠土壤。

The flat land and sparse population and relative lean soil cause forest management to depend on mechanization and intensive cultivation and old-aged harvest system.

土地平整、口稀少、壤肥力较低，是该林业公司机械化作业、约化经营、伐年龄较大的缘由。

The main results were as followings: Increasing nitrogen fertilizer can prominently promote rape yields under the nitrogen supply at level of 22.5 Kg/ 667m~ 2, especially in lean soil.

在施纯氮0～22.5kg/667m~2范围内，增施氮肥能够显著提高油菜产量，在肥力不高的土壤中增产效果更为突出。

Study on Lean Soil Improvement for Planting in Baotou Trial Area, Inner Mongolia, China, by Adding Coal Ash, Reservoir Sediments and Sewage Sludge

粉煤灰、水库淤积物和污水沉淀物改良砂质贫瘠土壤植树种草的研究&以内蒙古包头试验区为例

Due to fewer rainfall, lean soil, serious soil and water loss and the long term negative effect of human activity, the ecological environment in hilly semi arid area is being degraded.

低山丘陵半干旱区气候干旱、土地贫瘠、水土流失严重，加上人类活动的长期负面影响，使得该地区生态环境不断恶化。