OS0607 YWANG what is good soil

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Published on January 22, 2008

Author: Silvestre

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Clay, loess & loam - what is good soil ? :  Clay, loess & loam - what is good soil ? Yana Wang 17.01.2007 Soil:  Soil Soil Science Society of America (SSSA):  Soil Science Society of America (SSSA) Soil is the unconsolidated mineral material on the immediate surface of the Earth that serves as a natural medium for the growth of land plants. composition of soil by volume:  composition of soil by volume Ideal fertile soil Mineral 45% Organic matter 5% Water 25% Air 25% http://jpkc.snnu.edu.cn/geog/webasp/kj/kejian/6%20turangquan.ppt soil particle:  soil particle Rock and mineral weathering Parent material Soil formation Soil particle physical chemical biological Primary particle Secondary particle classification systems of soil :  classification systems of soil Criterion: equivalent diameter or effective diameter of soil particle Soil texture: gravel >2 mm sand 0.05~2 mm silt 0.002~0.05 mm clay < 0.002 mm Slide8:  http://netc.nwsuaf.edu.cn/jingpin/2003/turangxue/ppt/2.1.ppt soil particle:  soil particle The larger the particles are, the more SiO2 the soil has, the more barren it is. http://netc.nwsuaf.edu.cn/jingpin/2003/turangxue/ppt/2.1.ppt Slide10:  http://netc.nwsuaf.edu.cn/jingpin/2003/turangxue/ppt/2.1.ppt Slide11:  http://netc.nwsuaf.edu.cn/jingpin/2003/turangxue/ppt/2.1.ppt Clay:  Clay Mineral: Al2[(OH)4Si2O5] · nH2O Al2O3 · 2SiO2 · 2H2O etc. poor aeration and drainage plastic when wet, when dry become firm Slide15:  Clay is only good for paddy rice field. loess:  loess Mineral: most carbonates small amount of clay minerals good aeration, water-holding ability easy to be transported by river and wind for example: 1935 dust storm in midwest United States loam:  loam mixture of clay, silt and sand sandy, plastic when wet easily water contain more nutrients than sandy soils ideal fertile soil other parameters:  other parameters organic matter pH value etc. organic matter:  organic matter microorganism soil animal organic manure http://netc.nwsuaf.edu.cn/jingpin/2003/turangxue/ppt/3.1.ppt organic matter:  organic matter element: 90~95% C、O、H、N、 P、K、Ca、Mg、Fe、Si、 Zn、Cu、B、Mo、Mn etc. soil fertility: soil pH value:  soil pH value climate: high temperature and humidity accelerates the weathering microorganism: for example: breath from bacterium environment: acid rain Slide24:  The best pH value for plants is 6,5 . soil pH value http://netc.nwsuaf.edu.cn/jingpin/2003/turangxue/ppt/5.1.ppt Slide25:  http://netc.nwsuaf.edu.cn/jingpin/2003/turangxue/ppt/5.1.ppt Slide26:  Fruit http://netc.nwsuaf.edu.cn/jingpin/2003/turangxue/ppt/5.1.ppt Slide27:  Vegetables http://netc.nwsuaf.edu.cn/jingpin/2003/turangxue/ppt/5.1.ppt Summary:  Summary Clay: perfect water-holding ability good for paddy rice field Both loess and loam can be tillable soil for most of plants. But loam is better, because of more nutrient. more than 1.5% organic matter pH value by 6.5 Reference:  Reference C.Y.Huang, Soil Science,1991 J. Bachmann, G. Arye, M. Deurer, S. K. Woche, R. Horton,Y. Chen, J. Plant Nutr. Soil Sci. 2006, 169, 745–753 http://netc.nwsuaf.edu.cn/jingpin/2003/turangxue/html/link.html http://soil.gsfc.nasa.gov/soilform/deposits.htm http://nhjy.hzau.edu.cn/kech/2006/turangxue/dzja.html http://en.wikipedia.org/wiki/Clay http://en.wikipedia.org/wiki/Loess http://en.wikipedia.org/wiki/Loam Slide30:  Thank you for your attention!

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