TAMASA agronomy and household data are available on the CIMMYT Research Data & Software Repository Network, which is a Dataverse repository
TAMASA datasets are labeled by country (ET=Ethiopia, NG=Nigeria and TZ=Tanzania) and area of research, which correspond to TAMASA Workstreams. The areas of research and the data are briefly described below.
Agronomy Panel Survey (APS)
The APS is a panel survey that integrates household and community data with agronomy, yield and soil data from a maize focal plot. The survey was conducted in the 2016 and 2017 seasons and covers approximately 750 households in each country.
Nutrient Omission Trials (NOT)
NOTs, which are a standard method to assess and predict nutrient requirements by omitting one nutrient or element (NPK typically), have been conducted in all three countries in multiple years. Datasets comprise pre-planting soil analysis and yield data.
Performance Trials (PT)
PTs are trials with four treatments that compare the regional fertilizer recommendation with fertilizer recommendations generated by Nutrient Expert (https://software.ipni.net/article/nutrient-expert) based either on field management history or based on a soil test. There was also a zero fertilizer control. Datasets include the nutrient recommendations and yield data
Variety Tool (VT)
Multi-locational trials to represent different temperature regimes were conducted in each country to generate crop phenology data on commonly grown maize varieties. The dataset comprises dates of key phenological events and in some cases yield
Crop-cut, agronomy and soil data
Crop-cuts, soil samples (0-20, 20-50cm) and a minimum agronomy dataset were collected from farmers’ fields in TAMASA’s area of interest from 2015. Crop-cuts were replicated while soil samples were bulked. Most crop-cuts and soil samples in 2016 and 2017 are linked via a common identifier to the APS data.