Land con®guration in combination with nutrient management has the potential to improve the productivity of Al®sols and Vertisols in the semi-arid tropics. A four year (1989±1990 and 1992±1993) ®eld experiment was conducted at Coimbatore, India on Al®sols (Chromic Cambisol) to compare the effect of land con®guration and nutrient management practices on yield of rainfed sorghum (Sorghum bicolor (...

Calcium is a key element of the Earth system and closely coupled to carbon cycle. Weathering silicate releases Ca, which exported sequestered in oceans. However, pedogenic calcium carbonate constitutes second Ca-trapping pathway that has received less attention. Large accumulations nodules, associated with palaeo-Vertisols, are widespread North Cameroon, despite carbonate-free watershed. A prev...

Improving soil fertility is one of the most common practices in agricultural productivity for all crops. Teff [Eragrostistef(Zucc.) Trotter] is the major indigenous cereal crop of Ethiopia, where it was originated and diversified. It is a highly demanded and a staple food grain for 60-65% of the Ethiopian people. In a country of over 80 million people, teff accounts for about 15% of all calorie...

Abstract In terrestrial settings, the Permo-Triassic mass extinction is commonly linked to major changes in sedimentological and climatic conditions that include a switch from meandering braided fluvial systems increased aridity. We examined predominantly strata of North China reveal that, on contrary, there was little substantial change during extinction. The crisis level occurs upper Sunjiago...