Table 2.

Sources for fertilizer and maize yield data compilation.

Data source	Number of field trials	Number of treatment plots	Reference
IFDC	263	919	Compiled from published journal articles [32]
NRI&U	86	1017	Compiled from national research institutes (CSIR-SRI, CSIR SARI) and universities (KNUST, UG, UDS)
IFDC – FERARI Project	133	1200	Compiled from FERARI project 2020 field trials
Total	482	3136

CSIR-SRI: Council for Scientific and Industrial Research – Soil Research Institute, CSIR SARI: Council for Scientific and Industrial Research – Savanna Agriculture Research Institute, KNUST: Kwame Nkrumah University of Science and Technology, UG: University of Ghana, UDS: University for Development Studies.