Iron scoria as carrectives of soil acidity. II. Greenhouse experiments

Abstract

The data concerning the obtained results from competition experiments among ameliorating material having different particle-sizes (iron scoria versus dolomitic limestones) are presented. The experiments were performed in greenhouse, with corn (Zea mays, L.) hybrid HMD-7974 as the test plant, which was cut at 45 days after germination. The following residues were compared: Extramil, Progresso and dolomitic limestone, using medium texture Dark Red Latosol, clayey Dark Red Latosol and clayey Red Yellow Latosol; Extramil, Progresso, Usita and ltatiaia, using alluvial soil and Low humic Gley; in all the cases the test plot received only the basic NPK fertilization. The liming necessity was estimated according to the Committee on soil Fertility, and the materials were incubated for periods of 15, 30, 60 and 90 days, as a function of particle-size. The results show that every material used had good performance on the production of dry matter and that the residues which passed 100% in the sieve smaller than 0,297mm in diameter and bigger than 0,149mm in diameter had equal or superior behavior in comparison with the dolomitic limestone, whereas the materials which passed in sieves smaller than, 0,149mm in diameter presented smaller production. Among the residues, Extramil seems to be the best one.