This long term experiment began in 1972. The experimental site is a
tropical area, with a minimum annual temperature of 5.9 deg C, maximum
annual temperature of 42.8 deg C, and mean annual rainfall ...
This experiment began in 1967 at a site that was originally
shrubland. The project consists of one rotation: Pearl
millet-wheat. Treatments = 1) Absolute control, 2) Farm yard manure
added, 3) N-fertilizer ...
This project began in 1971 at a tropical site that was once natural
forest. The soil is described as a Beni silty clay loam series of
fine loamy mixed hyperthermic family of Aquic Hapludoll (USDA). ...