|
The Handbook 60 Keyword Index allows the reader to quickly view the contents of this historic document, prior to downloading a PDF file. Note that many of the techniques mentioned are obsolete and have been replaced by modern methodologies. |
|
Chapter 1 |
Origin and nature of saline and alkali soils |
Chapter 2 |
Determination of the properties of saline and alkali soils |
Chapter 3 |
Improvement and management of soils in arid and semiarid regions in relation to salinity and alkali |
Chapter 4 |
Plant response and crop selection for saline and alkali soils |
Chapter 5 |
Quality of irrigation water |
Chapter 6 |
Methods for soil characterization |
Chapter 7 |
Methods of plant culture and plant analysis |
Chapter 8 |
Methods of analysis of irrigation waters |
|
|
|
|
Chapter 1. Origin and nature of saline and alkali soils |
Sources of soluble salts Salinization of soils Alkalication or accumulation of exchangeable sodium in soils Characteristics of saline and alkali soils Saline soils Saline-alkali soils Nonsaline-alkali soils
top of page |
|
Chapter 2. Determination of the properties of saline and alkali soils |
Soil sampling Estimation of soluble salts from electrical conductivity of the saturation extract and the saturation percentage Relation of conductivity to salt content and osmotic pressure Conductivity of 1:1 and 1:5 extracts Salinity appraisal from the electrical resistance of soil paste Conversion of conductivity data to a standard reference temperature Comparison of percent salt in soil and extract measurements Chemical determinations Soil reaction-pH Soluble cations and anions Soluble boron. Exchangeable cations Gypsum 20 Alkaline-earth carbonates (lime) Physical determinations Infiltration rate Permeability and hydraulic conductivity Moisture retention by soil Density and porosity Aggregation and stability of structure Crust formation Choice of determinations and interpretation of data. Equilibrium relations between soluble and exchangeable cations Chemical analyses of representative soil samples Nonsaline-nonalkali soils Saline soils Nonsaline-alkali soils Saline-alkali soils Cross-checking chemical analyses for consistency and reliability Factors that modify the effect of exchangeable sodium on sods Texture Surface area and type of clay minerals Potassium status and soluble silicate Organic matter Sequence of determinations for soil diagnosis
top of page |
|
Chapter 3. Improvement and management of soils in arid and semiarid regions in relation to salinity and alkali |
Basic principles Irrigation and leaching in relation io salinity control Irrigation Leaching Leaching requirement Leaching methods Field leaching trials Special practices for salinity control Drainage of irrigated lands in relation to salinity control Drainage requirements Water-transmission properties of soils Boundary conditions Layout and placement of drains Techniques for drainage investigations Measurements of hydraulic head Determination of subsoil stratigraphy Determination of water-transmitting properties of soils Chemical amendments for replacement of exchange able sodium Suitability of various amendments under different soil conditions Chemical reactions of various amendments in alkali soils Class 1. Soils containing alkaline-earth carbonates Class 2. Soils containing no alkaline-earth carbonates; pH 7.5 or higher Class 3. Soils containing no alkaline-earth carbonates; pH less than 7.5 Estimation of amounts of various amendments needed for exchangeable-sodium replacement Speed of reaction of amendments and economic considerations Application of amendments Laboratory and greenhouse tests as aids to diagnosis Reclamation tests in the field Reclamation of saline and alkali soils in humid regions
top of page |
|
Chapter 4. Plant response and crop selection for saline and alkali soils |
Significance of indicator plants for saline soils Indicator plants Crop response on saline soils Salinity and water availability Specific ion effects Sodium Calcium Magnesium Potassium Chloride Sulfate Bicarbonate Boron Plant analysis Crop selection for saline soils Germination Relative salt tolerance of crop plants Relative boron tolerance of crop plants |
|
Chapter 5. Quality of irrigation water |
Methods of analysis Characteristics that determine quality Electrical conductivity Sodium-adsorption-ratio Boron Bicarbonate Typical waters Classification of Irrigation waters Salinity hazard Sodium hazard Diagram for classifying irrigation waters Conductivity Sodium Effect of boron concentration on quality
top of page |
|
Chapter 6. Methods for soil characterization |
Sampling, soil extracts, and salinity appraisal (1)Soil sample collecting, handling, and subsampling 83 (2) Saturated soil paste 84 (3) Soil-water extracts 84 (3a) Saturation extract 84 (3b) Twice-saturation extract for coarse-textured soils (tentative) 88 (3c) Soil-water extracts at 1:1 and 1:5 88 (3d) Soil extract in the field-moisture range 88 (4) Electrical conductivity of solutions.89 (4a) Standard Wheatstone bridge 89 (4b) Direct indicating bridge 89 (5) Resistance of soil paste and percent salt in soil 91 (6) Freezing-point depression 91 (6a) Freezing-point depression of solutions 91 (6h) Freezing-point depression of water in soil cores 93 Soluble cations and anions 94 (7) Calcium and magnesium by titration with ethylenediaminetetraacetate (Versenate). 94 (8) Calcium by precipitation as calcium oxalate. 95 (9) Magnesium by precipitation as magnesium ammonium phosphate 95 (10) Sodium 96 (10a) Sodium by flame photometer 96 (10b) Sodium by precipitation as sodium uranylzinc acetate 97 (11) Potassium 97 (Ila) Potassium by flame photometer 97 (llb) Potassium by precipitation as potassium dipicrylaminate 98 (12) Carbonate and bicarbonate by titration with acid 98 (13) Chloride by titration with silver nitrate 98 (14) Sulfate 99 (14a) Sulfate by precipitation as barium sulfate 99 (14b) Sulfate by precipitation as calcium sulfate 99 (15) Nitrate by phenoldisulfonic acid 100 (16) Silicate as silicomolybdate 100 (17) Boron 100 Exchangeable cations 100 (18) Exchangeable cations 100 (19) Cation-exchange-capacity 101 (20) Exchangeable-cation percentages 101 (20a) Exchangeable-cation percentages by direct determination 101 (20b) Estimation of exchangeable-sodium-percentage and exchangeable-potassium-percentage from soluble cations 102 Supplementary measurements 102 (21) pH determinations 102 (21a) pH reading of saturated soil paste 102 (21b) pH reading of soil suspension 102 (21c) pH reading of waters, solutions, and soil extracts 102 (22) Gypsum 102 (22a) Gypsum by recipitation with acetone (qualitative 102 (22b) Gypsum by precipitation with acetone (quantitative) 104 (22c) Gypsum by increase in soluble calcium plus magnesium content upon dilution.104 (22d) Gypsum requirement 104 (23) Alkaline-earth carbonates (lime) 105 (23a) Alkaline-earth carbonates by effervescence with acid 105 (23b) Alkaline-earth carbonates by gravimetric loss of carbon dioxide 105 (23c) Alkaline-earth carbonates from acid neutralization 105 (24) Organic matter 105 (25) Total and external ethylene glycol retention 106 Soil water 107 (26) Soil-moisture content 107 (27) Saturation percentage 107 (27a) Saturation percentage from oven-drying. 107 (27b) Saturation percentage from volume of water added 107 (27c) Saturation percentage from the weight of a known volume of paste 107 (28) Infiltration rate 108 (28a) Basin 108 (28b) Cylinder 108 (29) 1/10-atmosspner- percentage 109 (30) 1/3-atmosphere percentage 109 (31) 15-atmospp percentage 109 (32) Moisture-retention curve 110 (33) Field-moisture range 111 (34) Hydraulic conductivity 111 (34a) Hydraulic conductivity of soil cores (34b) Hydraulic conductivity of disturbed soil 112 (340 Hydraulic conductivity from piezometer measurements 113 (34d) Hydraulic conductivity from auger-hole measurements 114 (35) Hydraulic-head measurements in saturated soil 116 (35a) Piesometers installed by driving 116 (35b) Piezometers installed by jetting 117 (35c) Observation wells uncased or with perforated casing 117 (36) Ground-water graphical methods 118 (36a) Water-table contour maps 118 (36b) Water-table isobath maps 118 (36c) Profile flow patterns for ground water 118 (36d) Water-table isopleths for showing time variations in the elevation of the water table 119 Physical measurements 120 (37) Intrinsic permeability 120 (37a) Permeability of soil to air 120 (37b) Permeability of soil to water 121 (38) Bulk density 121 (39) Particle density 122 (40) Porosity 122 (41) Particle-size distribution 122 (42) Aggregate-size distribution 124 (42a) Wet sieving 124 (42b) Aggregation of particles less than SO microns 125 (43) M Olulus of rupture 126
top of page |
|
Chapter 7. Methods of plant culture and plant analysis |
Plant-culture techniques adapted to salt-tolerance investigations (50) Artificially salinized field plots.127 (51) Drum cultures 128 (52) Sand and water cultures, 128 Methods of plant analysis128 (53) Sampling and preparation of plant samples128 (54) Ashing 129 (54a) Wet digestion,129 (54b) Magnesium nitrate ignition 129 (55) Calcium 129 (55a) Calcium by flame photometer129 (55b) Calcium by oxalate method130 (56) Magnesium 130 (57) Sodium 131 (57a) Sodium by flame photometer131 (57b) Sodium by uranyl zinc acetate 131 (58) Potassium 132 (58a) Potassium by flame photometer 132 (58b) Potassium by cobaltinitrite 132 (59) Chloride 133 (60) Sulfur 134 (61) Phosphorus 134 (62)Boron 134
top of page |
|
Chapter 8. Methods of analysis of irrigation waters |
(70) Collection of irrigation water samples (71) Records, reports, and expression of results (72) Electrical conductivity (73) Boron (73a) Boron, electrometric titration (73b) Boron, colorimetric, using carmine (74) Dissolved solids. (75) pH of waters (76) Silica (76a) Silica, gravimetric (76b) Silica, colorimetric (77) Calcium (78) Magnesium (79) Calcium and magnesium by the Versenate method (80) (80a) Sodium by uranyl zinc acetate, gravimetric (80b) Sodium by flame photometer (81) Potassium (81 a) Potassium by cobaltinitrite, gravimetric (81b) Potassium by cobaltinitrite, volumetric. (81c) Potassium by flame photometer (82) Carbonate and bicarbonate (83) Sulfate (84) Chloride (8.5) Fluoride (86) Nitrate (86a) Nitrate, phenoldisulfonic acid (86b) Nitrate, Devarda
top of page |
|
Literature cited |
Appendix |
Symbols and abbreviations |
Conversion formulas and factors |
Chemical symbols, equivalent weights, and common names |
Soil sampler and core retainer |
Modulus of rupture apparatus |