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Country guidelines and technical specifications for global soil nutrient and nutrient budget maps

GSNmap: Phase 1









FAO. 2022. Country guidelines and technical specifications for global soil nutrient and nutrient budget maps  GSNmap: Phase 1. Rome.



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    Article
    Effects of land use and land use change on soil properties in northeast rainforest landscapes of Madagascar
    XV World Forestry Congress, 2-6 May 2022
    2022
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    Soil is a major natural resource acting as a key interface between climate and biogeochemical systems. Tavy system or slash-and-burn agriculture influences soil quality and is responsible for releases of carbon stored in the soil. This study aims to evaluate soil properties in each land use and to determine the impact of land use change on these soil properties. The study area was located in an area in the rainforest of northeastern of Madagascar. Soil samples were collected on 135 study sites composed of nine land use types including natural forest, three cropland stages, tree fallow, mixed fallow, grassland and two cash crop plantations (vanilla and coffee). Mid-Infrared Spectroscopy (MIRS) was used to estimate organic carbon (C org), total nitrogen (N tot), cation exchange capacity (CEC), soil texture and pH KCl, while available phosphorus (P Olsen), soil bulk density (BD) and soil carbon stock (SOC) for 0-30 cm and 0-100 cm were estimated with conventional methods. At plot scale and at 0-30 cm, soil in the study area relevant highly variability. Statistical analysis shows that land use change in tavy system contributes significantly to this variability with a p-value <0.001 for P Olsen, C org and N tot, p-value < 0.01 for pH KCl and p-value < 0.05 for CEC and BD. Soil nutrients (P Olsen, C org and N tot) decrease during cultivation period and increase during fallow periods. The CEC and pH KCl were stable but decline rapidly at the grassland stage. SOC for both depths declines over two periods: after the first cropland and the third cycle of cropland after deforestation. The presence of tree vegetation in cash crops (vanilla and coffee) maintains a mean value of soil properties. The results presented in this study will be useful for forest landscape management and will allow the integration of the soil pool in the accounting of the SOC flow in the implementation of REDD+. Keywords: Agriculture, Biodiversity conservation, Climate change, Deforestation and forest degradation, Landscape management ID: 3483094
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    Book (stand-alone)
    Soil and plant testing and analysis. Report of an Expert Consultation, Rome, 13-17 June 1977
    FAO Soils Bulletin 38/1
    1980
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    Methods for evaluating nutrient status in order to obtain better plant growth and increased yield are constantly being developed and improved. New analytical techniques and procedures for soil and plant analysis have been invented and tested in many countries and laboratories. There have been innovations in data processing leading to preparation of more refined and specific fertilizer recommendations. The purpose of the Consultation was: i. to review advances in a) methodologies for soil and plant chemical analysis, and b) interpretation of the results obtained and the preparation of fertilizer recommendations based on these results. ii. to identify progress made and areas requiring further attention with regard to the organization of soil testing services in general and, in particular, in developing countries.
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    Book (stand-alone)
    Soil and nutrients loss in Malawi: an economic assessment 2018
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    Soil loss is a major threat to agricultural development in Malawi, and the size of the agricultural sector in the Malawian economy renders it a major limitation to the overall economic development of the country. Soil loss reduces cultivable soil depth, but also takes away fertile soils from farmlands. The net effect is a loss of agricultural productivity, increased expenditure on fertilizers, and a general decline in profitability of crop production. The aim of the project is to analyse the economic impact of both soil and nutrient loss in Malawi with new country-representative data on soil loss and nutrient indicators collected through field surveys, merged with detailed climatic data and socio-economic information. It translates soil loss/nutrient loss into yield loss and estimates the economic impact of loss on agricultural production as a result of soil degradation and then, it identifies best practices to mitigate the soil loss phenomenon.

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