Soil survey and land classification, Mindanao Island: soil and land resources appraisal and training project Philippines. 来自 AGRIS 喜欢 0 阅读量: 6 关键词: [enquete, sol, surveys, soil, clasificacion, encuestas, classification, philippines, suelo, filipinas] 年份: 1980 ...
and environmental quality, especially the detailed soil survey of Taiwan rural soils (1962–1976, 1974–1979), Taiwan hill land (1980–1988), contaminated soils (1984–1990), productivity grade of Taiwan upland (1986–1990), Taiwan forest soils in mountains (1993–2002), and Taiwan rural soils...
the size of the area, the land-use, the type of contaminants present, time of the year and last but not least the time and money available to perform the study. Nevertheless, a number of general considerations have to be made in the planning phase of a successful field survey. These ...
4.1. Soil Chemical Properties under Different Land Use/Cover Types According to the classification standard of soil pH, the pH values of all sample groups in the study area were alkaline (7.5–8.5). Based on the Nutrient grading standards for the second National Soil Survey [57], the soil ...
shape and grade, i.e. degree of distinctiveness of the secondary soil units, and depends on inter- and intra-aggregate adhesion, cohesion or stability (AgricultureCanada Expert Committee on Soil Survey, 1987; Soil Science Society of America, 1997). The boundaries between structural units are some...
Figure 2. Center pivot field/examples of areas to avoid irrigating include pivot road, pump house, and above-grade equipment. However, precision irrigation systems can be used to avoid irrigation of nonarable land areas in order to preserve structures, maintain access, or comply with environmental...
Those investigations provided plenty of data, but as Shen Renfang, a member of the National People’s Congress and head of the Nanjing Institute of Soil Science, said: ″The second survey was 40 years ago. There have been huge changes in how China uses its arable land, and in the nature...
longjiangProvince LandSurveyandUseTechnologyCenterof HeilongjiangProvince 1990 @@[23] SharyPA SharayaLS MitusovAV.Fundamentalquantitative methodsoflandsurfaceanalysis.Geoderma 2002 107 1-32 @@[24] 杨琳,朱阿兴,李宝林,等.应用模糊c均值聚类获取土壤 制图所需土壤-环境关系知识的方法研究.土壤学报,2007, 445...
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The first step in the preparation of the land is to clear the bushes if it is being used for the first time. These are always burned and stumps uprooted. This is done in order to break the hard soil pans, thereby loosening up the soil and leveling the land, using rakes, to leave on...