The dataset summarizes the activities of the RIEPT (International Tropical Pastures Evaluation Network) undertaken in isohyperthennic savannas in 1978. RIEPT focused on evaluating pasture germplasm to enhance animal production systems in diverse ecosystems prevalent in poor, acidic soils across vast agricultural frontiers in South America.

To achieve this, RIEPT employed various trial phases: Regional Trials A (RTAs) assessed germplasm adaptation potential in major ecosystems, while Regional Trials B (RTBs) further evaluated surviving and productive germplasm in representative subecosystems. These trials, conducted initially in monoculture, aimed to select germplasm adapted to different natural conditions. Multilocational analyses were employed for extrapolation.

Recognizing the need for further analysis, RIEPT proposed Regional Trials C (RTCs) and Regional Trials D (RTDs). RTCs focused on incorporating new germplasm into pastures to study productivity and persistence under grazing management systems. RTDs aimed to compare the performance of these pastures against traditionally used ones, measuring animal productivities within the predominant regional production systems.

The dataset contains trial data specifically related to activities conducted in isohyperthennic savannas, providing valuable insights into pasture germplasm evaluation within this ecosystem as part of RIEPT's broader initiatives across South America's agricultural frontiers.