In order to evaluate the saline tolerance of Rhizobium loti strains (NFB 494 and SEMIA 6069) on Leucaena leucocephala-cv K8, an experiment was carried out using a Red-Yellow Podzolic, submitted to different levels of soil salinity (C.E. = 1.5; 6.6; 10.1; 12.8 e 14.4 mS cm-1). For comparative purposes, a non-inoculated treatment was added with and without mineral fertilization (200 mg kg-1 soil of N as NH4NO3). The experimental design was a complete randomized block, arranged in a 5 x […]

Deactivation of saltworks in Cabo Frio, Rio de Janeiro, has been creating great amounts of organic residues originated from marine algae accumulation. Studies were carried out at the Soil Department of UFRRJ in 1996 to evaluate the potential for using such residues as organic fertilizers. Samples of the residue presented high contents of Ca, Mg, K, Na, S, and elevated values of bulk and real densities, water retention, pH and electrical conductivity; 89% of Na content was found in soluble […]

Salt-affected soils are characteristics of arid and semi-arid zones of the world. This study was undertaken at Açu valley region of Rio Grande do Norte State, Brazil, by means of a field experiment conducted from April/90 to January/91. The objective of this study was to evaluate the effects of subsoiling and amendment additions (gypsum, farmyard manure and Copernica cerifera straw), on chemical properties of saline sodic soil. Subsoiling treatment provided beneficial effects decreasing soil exchangeable sodium percentage (ESP) and pH […]

The purpose of present study was to evaluate the use of filter cake and stillage as amendment for reclamation of a saline-sodic soil. The experiment was conducted in greenhouse during July – October, 1993, utilizing an eutrophic alluvial sandy loam soil of Irrigated Perimeter of São Gonçalo-PB and adopting a 22 x 2 factorial in a randomized block design with four replications. The treatments consisted of presence/absence or combination of gypsum and filter cake and leaching with rainwater or stillage. […]