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Use of nitrogen and lime in the management of acidic soils









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    Book (stand-alone)
    Application of nitrogen-fixing systems in soil improvement and management
    FAO Soils Bulletin No.49
    1982
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    In view of the continuing increase in cost and scarcity of mineral fertilizers resulting from the use of high-cost fossil energy, there is renewed interest in organic recycling and biological nitrogen-fixation to improve soil fertility and productivity. The workshop in Alexandria recommended the further promotion of research, development, application and dissemination of information available on various aspects of biological nitrogen-fixation, including symbiotic systems of rhizobia/legume and Azolla/blue-green algae, and free-living nitrogen-fixing bacteria and blue-green algae. It is hoped that the compilation of various aspects of nitrogen-fixation under one cover in this Bulletin will be of interest and assistance to research workers and extension planners concerned with the further development and refinement of these natural systems for soil improvement and management.
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    Project
    Investigations on acid sulfate soils of the Brackishwater Experimental Fish Farm, Buguma, Rivers State
    Establishment of African Regional Aquaculture Centre
    1987
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    A study conducted on the soils of the brackishwater experimental fish farm Buguma, showed that the area contains potential acid-sulfate materials within 12cm of pond bottom in the soil profile. The sulfate sulfur (SO4-S) content of the sulfidic horizon is 2,700ppm. High values of exchangeable acidity and Al were also recorded for this horizon. Values were 16.96 and 7.89 meq/100g of soil respectively. The soils are saline, characterised by high soluble salt content and high values of K, Ca and Mg ions. pH values in the wet state ranged between 7.7 and 6.9, but on air drying, values went down to as low as 3.1. Total nitrogen and available phosphorus were relatively low, values ranged from 0.07 – 0.35% and 1.40 – 7.08 ppm respectively. Lime requirement was calculated for the soils; results indicate the need for approx. 4.1 tonnes of agricultural lime per hectare for neutralization
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    Policy brief
    Policy guidance note: Sustainable soil management
    Opportunities and recommendations for decision makers
    2024
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    Soils are a vital resource for agriculture and life on the planet. They are home to the diversity that gives rise to the heterogeneous productive landscapes that make Latin America and the Caribbean a strategic ally in global food production. They are also a productive resource that provides multiple functions, goods and services. Therefore, their sustainable management is a valuable tool to address global challenges such as population growth, degradation of productive resources and climate change. This policy brief, aimed at policymakers, presents a set of lines of action that can serve as a reference guide to contribute to the transition to sustainable soil management at different scales, from local to regional.

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