Greenhouse experiments were done with two purposes: (1) to identify strains of rhizobia effective and acid-tolerant in symbiosis with Lablab purpureus, and (2) to determine whether soil acidity or the symbiotic condition increased the phosphate requirement for growth. Five rhizobia! strains were tested in one neutral soil, two acid soils, and the two acid soils limed to pH 6.6. In the neutral a...

Based on these figures, it is no exaggeration to say that more than one-third of the Brazilian annual wealth is supported by a single natural resource: the soil. This justifies the impor‐ tance of studies on how to preserve and improve this valuable resource. According to [2], soils have natural limits to their ability to nourish plants and sustain crop productivity. The degradation of soil qua...

The Streptomyces populations inhabiting five acidic forest soils were examined. It was found that lowering the pH of a medium selective for streptomycetes (starch-casein agar) to the pH of the particular soil horizon being plated influenced both the total numbers and types of streptomycetes that were isolated from the soils examined in this study. On the acidified medium both the numbers of str...

Widespread decreases in rainfall throughout the Murray-Darling Basin, superimposed on the significant allocation of water for irrigation, resulted in an order of magnitude reduction in flow over the period from 2004-2009. This resulted in a dramatic shift in flow regimes and water quality in the lower River Murray, and in particular substantial decline in the water level of the Lower Lakes at t...

We sampled shrub canopy volume (height times area) and environmental factors (soil wetness, soil depth of thaw, soil pH, mean July air temperature, and typical date of spring snow loss) on 471 plots across five National Park Service units in northern Alaska. Our goal was to determine the environments where tall shrubs thrive and use this information to predict the location of future shrub expan...

In order to study of ecological and phenological traits of Ferulago angulata asan important medicinal plant, this research was conducted in Hezar Mountains andBondareh Henza in Kerman province, Iran. Random samples of this plant were taken andtheir vegetation habitat conditions and their growth characteristics including height ofcollar leaves, height of flower stem, flower stem number and forag...

Soil tillage systems can be able to influence soil compaction, water dynamics, soil temperature and crop yield. These processes can be expressed as changes of soil microbiological activity, soil respiration and sustainability of agriculture. Objectives of this study were: 1 to assess the effects of tillage systems (Conventional System (CS), Minimum Tillage (MT), No-Tillage (NT)) on soil compact...

abstract the effect of land use type on soil functioning within an ecosystem can be assessed and monitored using soil quality attributes. such studies, which are carried out to create a balance between the biological production and the maintenance and improvement of land resource quality, provide a framework for land degradation control and also for identification of sustainable management. in ...