Effective soil NPK supply, Rwanda

Soil nitrogen (N), phosphorus (P) and potassium (K) supply effectively available for uptake (kg/ha), calculated as a fraction of the measured and mapped contents of N, P and K,  using the formulas proposed by Sattari (Sattari et al. 2014, DOI:10.1016/j.fcr.2013.12.005) and pedotransfer functions (PTFs) from the QUEFTS model (Janssen et al., 1990, doi.org)90021-Z). The NPK input data is derived from Africa SoilGrids [Soil property maps of Africa at 250 m resolution] (doi.org) aggregated for the topsoil at 0-30 cm.   This research was carried out for the LSC-IS hubs project under the funding program Development Smart Innovation through Research in Agriculture (DeSIRA), European Union. Grant number: 4000004100   Coordinate Reference System - EPSG:32736 DISCLAIMER: These soil property maps were generated at a resolution of 100m, with the best available data at the time of production, including global datasets and legacy national level data, using digital soil mapping, GIS modelling and pedo-transfer functions. The derived products are provided 'as-is' without any warranty, regarding accuracy, completeness or fitness for a particular purpose. Users are advised to verify the information independently before making decisions based on it. Additionally, users should assess the local 'predictive' accuracy of the maps prior to using them for making recommendations at local (or field) level. The designations employed and the presentation of material in this information product do not imply the expression of any opinion whatsoever on the part of ISRIC concerning the legal status of any country, territory, city or area or of is authorities, or concerning the delimitation of its frontiers or boundaries. Despite the fact that this product is created with utmost care, the author(s) and/or publisher(s) and/or ISRIC cannot be held liable for any damage caused by the use of this portal or any content therein in whatever form, whether or not caused by possible errors or faults nor for any consequences thereof.