Soil and Environmental Analysis: Physical Methods - Chapter 15 (end) pdf

... Descriptions and Associated Physical Properties Texture Description Associated Physical Properties SANDY SOILS: soils dominated by sands; divided into three groups (sands, loamy sands, and sandy loams), ... development and stabil- ity of soil structure; cation exchange capacity (and hence nutrient retention and availability, and the activity and retention of residual soil-...

Ngày tải lên: 11/08/2014, 15:20

... Modeling and experimental validation. Soil Sci. Soc. Am. J. 63 :157 1 157 9. Blackwell, P. S., and M. J. Elsworth. 1980. A system for automatically measuring and recording soil water potential and rainfall. ... soil water potential. Soil Sci. Soc. Am. J. 46:900 –904. Campbell, G. S., and W. H. Gardner. 1971. Psychrometric measurement of soil water po- tential: Temperature...

Ngày tải lên: 11/08/2014, 15:20

... plate 150 G (e.g., 330 mm diameter ϫ 13 mm) Sand suction tables 2500 – 3150 B, C Can be handmade Sand–kaolin tables 5600 – 6350 B, C Can be handmade Pressure plate ex- tractor, 500 kPa 150 0–2500 ... images of soil porosity for analysing soil compaction around roots. Soil Sci. Soc. Am. J. 60: 895 –901. Bruce, R. R., and Luxmoore, R. J. 1986. Water retention: Field methods. In: Met...

Ngày tải lên: 11/08/2014, 15:20

... Bureau of Standards. Amoozegar, A., and Warrick, A. W. 1986. Hydraulic conductivity of saturated soils: field methods. In: Methods of Soil Analysis. Part 1. Physical and Mineralogical Methods (A. ... seepage into pits. Soil Sci. Soc. Am. J. 48: 10 15. Bouma, J. 1977. Soil Survey and the Study of Water in Unsaturated Soil. Soil Survey Pa- pers, No. 13. Wageningen: Netherl...

Ngày tải lên: 11/08/2014, 15:20

... Equipment 5. Standard for soil laboratory 4. General-purpose, off-the-shelf 3. Easily made in average machine shop 2. Special-purpose, off-the-shelf 1. Special-purpose, custom-made I. Operator ... seal the soil col- umn for unsaturated measurements) and protects the soil column in the field and during transport to a laboratory. Somewhat more disturbed soil columns from en- tire so...

Ngày tải lên: 11/08/2014, 15:20

... K s and S (Eq. 15) , and by measuring u s and u n , Eqs. 26 and 28 give us functional descriptions of the soil s D(u) and K(h). These capillary and gravity properties allow us to infer some pore-geo- metric ... 1972. Two- and three-dimensional infiltration: Seepage from irrigation chan- nels and infiltrometer rings. J. Hydrol. 15: 301– 315. 280 Clothier Copyright © 2000 Marc...

Ngày tải lên: 11/08/2014, 15:20

... 1981a: NF-X-1 1-6 83; 1981b: NF-X-1 1-6 30; 1982: NF-X-1 1-6 42; 1983a: NF-X-1 1-6 85; 1983b: NF-X-1 1-6 93; 1983c: NF-X-3 1-1 07; 1984: NF-X-1 1-6 82; 1990: NF-X-1 1-6 61; 1992: NF-X-1 1-6 67; 1997a: NF-X-1 1- 671; ... B. S., and Mokhtaruddin, A. M. 1996. A computer program to determine the soil textural class in 1-2 -3 for WINDOWS and EXCEL. Commun. Soil Sci....

Ngày tải lên: 11/08/2014, 15:20

... undisturbed soil cores by gamma-ray attenuation. New Zealand Soil Bureau, Report 67. Sharratt, B. S. 1996. Tillage and straw management for modifying physical- properties of a sub-arctic soil. Soil Till. ... direct and indirect methods are detailed. Direct methods discussed in- clude the core sampling, rubber balloon, sand replacement, and clod methods. Indirect methods...

Ngày tải lên: 11/08/2014, 15:20

... carboniferous clay soils in north cen- tral Ireland and their significance. Ir. J. Agric. Res. 15: 129 –135. Nagaraj, T. S., and M. S. Jayadeva. 1981. Re-examination of one-point methods of liquid limit ... strength and liquidity index and also be- tween compression index and plasticity index (Wroth and Wood, 1978). C. Other Methods Several workers have devised methods of me...

Ngày tải lên: 11/08/2014, 15:20

... 1980. A new hand-held recording penetrometer for soil studies. J. Soil Sci. 31 : 279–296. Ball, B. C., and M. F. O’Sullivan. 1982. Soil strength and crop emergence in direct drilled and ploughed ... diameter and penetra- tion rate. Care must be taken, when sampling soils for needle-penetrometer measure- ments, that the soil is compressed as little as possible during coring. S...

Ngày tải lên: 11/08/2014, 15:20