Book Chapter describing methods of particle-size analysis for soils. Includes a variety of classification schemes. Standard methods for size distributions using pipet and hydrometer techniques are described. New laser-light scattering and related techniques are discussed. Complete with updated references.

Particle-size analysis.

This is a review of worldwide land degradation problems. Four themes are emphasized: delineating and estimating the magnitude of soil erosion, quantifying erosion and sedimentation impacts on land productivity, establishing quantitative values for erosion-causing parameters, and implementing global and regional soil and water conservation programs. Papers deal with both developing and developed countries and illustrate how erosion control techniques used in developed countries can or cannot be applied in developing countries.

https://gendocs.ru/docs/29/28948/conv_1/file1.pdf

Soil Erosion and Conservation

This manual is a compilation of methods used for soil and plant analysis at the Analytical Services Laboratory of the Northern Forestry Centre (NoFC) of Forestry Canada's Northwest Region. The intent of this manual is not so much to recom­ mend certain procedures over others, but to indicate methods used in our labora­ tory, why these methods are used, their expected precision and accuracy, and their strengths and weaknesses. RESUME Sont reunies dans Ie present guide les methodes utilisees pour l'analyse des plantes et des sols au Laboratoire des services d' analyse du Centre de foresterie du Nord de Forets Canada (region du Nord-Ouest). L' objectif de ce guide n' est pas tant de recommander certaines methodes de preference a d'autres, mais d'indiquer celles qui sont utilisees dans notre laboratorre, la raison de leur utilisation, I' exact­ itude et la precision que I' on peut attendre de leurs resultats, leurs points forts et leurs points faibles. /nf. Rep. NOR-X-3/9 iii iv In! Rep. NOR-X-319

/pdf/methods-manual-for-forest-soil-and-plant-analysis-46mwq7zn6f.pdf

Methods manual for forest soil and plant analysis

Net aboveground production (4.1-9.5 Mg ha- Iyr-') across a series of edaphic climax forests was highly correlated with field measurements of soil N mineralization (26-84 kg ha-- yr-'; r2 = 0.902, P < .001) and with soil silt + clay content (5-74%; r2 = 0.883, P < .001). Soil N min- eralization was positively correlated with litter production and N and P return in litter. Soil N min- eralization was negatively correlated with litter C:N and C:P ratios and with efficiency of P use in litter production. Efficiency of N use in litter production declined with increasing N mineralization except for inefficient use of N in a hemlock stand at low N mineralization. Changes in litter quality across the mineralization-soil texture gradient were due to species replacement rather than changes in litter quality within each species. Nitrification was not correlated with aboveground production. Both mineralization and nitrification were highly correlated with humus P content. Differences in nitrification among the soils appeared to be related to P04-P supply in the spring and early summer and to NH4-N supply in mid- to late summer.

Aboveground Production and N and P Cycling Along a Nitrogen Mineralization Gradient on Blackhawk Island, Wisconsin

http://wpg.forestry.oregonstate.edu/sites/wpg/files/seminars/2000_Bryan_Geom.pdf

Soil erodibility and processes of water erosion on hillslope

Hydrometer Method Improved for Making Particle Size Analyses of Soils1

A Recalibration of the Hydrometer Method for Making Mechanical Analysis of Soils1

The Sand + Silt/Clay ratio in soils is suggested in this paper as a possible criterion of judging the relative susceptibility of soils to erosion. This ratio is designated as the clay ratio. It was compared with the erosion ratio by using the same soils and the same mechanical analyses of these soils as reported by the U. S. Bureau of Chemistry and Soils. The comparison shows that with few exceptions the two ratios agree fairly well in indicating the general susceptibility of soils to erosion.

George John Bouyoucos

Papers

Hydrometer Method Improved for Making Particle Size Analyses of Soils1

A Recalibration of the Hydrometer Method for Making Mechanical Analysis of Soils1

The Clay Ratio as a Criterion of Susceptibility of Soils to Erosion1

A Practical Soil Moisture Meter as a Scientific Guide to Irrigation Practices1

Rapid determination of the moisture content of soils.