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Brochure, flyer, fact-sheetStandard operating procedure for saturated soil paste extract 2021
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Salt-affected soils severely limit crop growth, reduce yield, and cause plant stress and soil structure degradation. Therefore, soil salinity/alkalinity interpretation is essential to develop and apply sustainable agricultural practice and suitable irrigation techniques in semiarid and arid environments. Salinity is a soil condition characterized by a high concentration of soluble salts, generally defined as one in which the electrical conductivity (EC) of saturate soil paste extract (ECe) in the root zone exceeds 4 dS m-1 at 25 oC (Richards, 1954). Sodic soils are those with a percentage of exchangeable sodium (ESP) greater than 15. Because of the considerable experimental errors involved in ESP determination, emphasis has been placed on using the sodium adsorption ratio (SAR) of the equilibrium soil solution instead of the ESP for classification purposes. The electrical conductivity of saturation soil extracts may vary, but usually remains below 4 dS m-1 at 25 °C. The pH of saturated soil paste in sodic soils is 8.2 or higher, and in extreme cases may exceed 10.5. However, many crops exhibit a yield reduction at a lower ECe because soil salinity/alkalinity affects a number of morphological, physiological and biochemical processes and water and nutrient or toxic elements uptake (FAO, 2018; Filipovic et al, 2018). The main aim of this SOP is to prepare a saturated soil paste to measure electrical conductivity (ECe) and soluble salts of a soil from a saturated paste extract. -
BookletStandard operating procedure for boron determination in soil: Hot water extraction 2024
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No results found.The hot water-soluble B procedure is the most commonly used method for predicting the concentration of B that will be available to plants in a soil solution. Hot water-soluble B is commonlyused because the water-soluble B extracted by the hot water method correlates positively to plant growth response, as it measures B from the adsorbed, organic, and soluble pools of the soil at boiling temperatures. The aim of this SOP is to guide users on the determination of hot water-soluble B in soils through the application of three routine procedures, using azomethine-H, AAS, ICP-AES, and the Berger and Truog extraction method. -
Book (stand-alone)Thematic 1: Farmers’ guidelines on soil and water management in salt-affected areas 2023
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No results found.The threats posed by salt-affected soils to global food security are dire. According to the recent Global salt-affected soils map, over 424 million hectares of topsoil (0–30 cm) and 833 million hectares of subsoil (30–100 cm) are currently salt-affected. This practical guide to soil and water management in salt-affected areas provides vital information to farmers dealing with salinity and sodicity issues on their farms and assists them in following suggested practices to mitigate or/and to adapt to these unfavourable conditions without compromising further losses in yields.
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