روزنامه با شماره پیاپی سال 1997

6

959

964

The purpose of this work was to study in an unsterilized acid soil the response of the tropical tree legume Mimosa caesalpiniaefolia to phosphogypsum as a P-fertilizer compared with soluble phosphorus fertilizer and to evaluate the interaction of P fertilization with Bradyrhizobium spp and vesicular arbuscular mycorrhizal fungi (VMF) (Glomus spp and Gigaspora spp) inoculations. A sandy clay red yellow latosol representative acid soil from the forest humid zone of Pernambuco, Brazil was used. P-fertilizer treatments equivalent to 40 kg P ha−1, were applied as triple superphosphate (TSP), phosphogypsum (GP) or a mixture of both. Plants were harvested 80 d after seed germination. P-sources increased mycorrhizal infection only when plants were not inoculated with rhizobia strains, suggesting that native mycorrhizal fungi are not able to develop efficiently in this soil, and the VMF-used groups did not significantly affect any of the factors analysed. In summary, it was concluded that in unsterilized acid soil without P-addition Badyrhizobium strain NFB 577 seemed to be more effective, but when P-fertilizer was used both strains were similarly effective. TSP showed the best results, but PG can be used as a P-fertilizer when combined with a suitable rhizobia strain.

Reports on Mathematical Physics

1997

Reports on Mathematical Physics