Paddy Soils in Tropical Asia : Part 1. Description of Fertility Characteristics

Abstract

The results of laboratory studies conducted on 410 sample soils collected from different countries of tropical Asia have been described. The items taken up in this paper are those routinely analyzed for characterization of fertility status of paddy soils, such as pH, total carbon, total nitrogen, ammoniacal nitrogen, total and available phosphorus, cation exchange capacity, exchangeable cations, and available silica. A histogram and/or a table showing country means and other statistics were given for each item. Many of these characters are correlated with each other and with material as well as climatic and local relief features. This aspect of the data will be dealt with in one of the papers to follow.