1.
Primary Study on Techniques of Soil Fertility Maintenance in Ecological Phyllostachys heterocycla var. pubescens Stands
生态型毛竹林土壤肥力维持技术初探
2.
Development of microbial fertilizer and maintaining of soil biological fertility;
微生物肥料的发展与土壤生物肥力的维持
3.
Study on the Soil Fertility Change and Long-Term Maintenance of Productivity in Chinese Fir Plantation;
杉木林土壤肥力变化和长期生产力维持研究
4.
The most important problems research had to solve were:(1). build-up and maintenance of soil fertility;(2). avoid soil hardpan and(3). control soil erosion.
研究要解决的最重要问题是：（）累和维持土壤肥力；（）免土壤硬磐；（）制土壤侵蚀。
5.
Treatments of manure, lime, N, P, and K are necessary to maintain nutrient levels and productivity of the soil.
需要粪肥、石灰、氮、磷和钾处理以维持土壤养分水平和生产力。
6.
Farmers rotate their crops so that the soil will remain fertile.
为保持土壤肥力, 农民搞作物轮作。
7.
The rotation of crops keeps the soil healthy and fertile.
谷物轮种使土壤保持了肥力和高质。
8.
Study on the Strategy of Maintain of Soil Fertility in Pinus kesiya var langbianensis Planted Forest Lands;
思茅松人工林土壤肥力维护对策研究
9.
Crop rotations without addition of fertilizers help maintain soil organic carbon and N levels, but do not maintain high productivity levels.
*不施肥的作物轮作有助于维持土壤有机碳和氮水平，但不能维持高生产力水平。
10.
The Comparative Study on the Value of Maintaining Soil Fertility for Land Consolidation
土地整理中土壤肥力保持价值比较研究
11.
"The smaller the soil particles, the greater is the surface area of the soil; the water holding capacity, the power of holding plant food and the tenacity of the soil depend on this surface area. "
土粒愈小，则土壤的表面积愈大。土壤的持水力、保肥力和土壤韧度都决定于这一表面积的大
12.
Crop rotations with legumes help maintain fertility and soil microbiology.
与豆类轮作可以保持土壤的肥力和微生态。
13.
Soil Fertility Comprehensive Evaluation of Cultivated Land Based on GIS at Town and Township Level;
GIS支持下乡镇域耕地土壤肥力的综合评价
14.
It is concluded that the mixed stand can be able to be self-rich in soil fertility, which benefit the maintenance and improvement of site fertility under Chinese fir plantation.
表明杉木拟赤杨混交林具有良好的培肥土壤功能，对杉木人工林的地力维持和提高有重要意义。
15.
Effects of Long-Term Application of Fertilizer and Rice Straw on Soil Fertility and Sustainability of a Reddish Paddy Soil Productivity
长期施用化肥和稻草对红壤水稻土肥力和生产力持续性的影响
16.
After having occupied previously the high fertility soils, sugarcane is now moving toward low fertility soils.
以前甘蔗占用高肥力土壤，现已转向低肥力土壤。
17.
Tropical Soil Biology and Fertility
热带土壤生物学和肥力网(土肥网)
18.
Organic fertilizers seemed very effective on improving soil fertility as well as soil properties.
有机肥似乎对改善土壤肥力和土壤性状很有效。