flood water contains high amount of sediment affecting the fertility of the coarse grain alluvial fans and flood plains through increasing nutrients. in this study, the effects of the flood water spreading on the soil nutrients recovery were investigated during 10 years (2004-2014) at the poldasht flood spreading station of west azarbaijan in iran. flooded three upper strips were selected at th...

to understand the relationship between natural physicochemical properties of soil and abundance of citrus root nematode (tylenchulus semipenetrans), a survey was conducted during 2009-2010 in some 37 citrus orchards, in kohgilouyeh va boyerahmad province, iran. distribution of the citrus nematode was determined by collecting random samples from the soil and citrus plant roots, extracting and en...

the superficial strata of ground have been perennially exposed to the action of natural agents such as heat, cold and water. however, grazing agent was not different from them when soils were investigated from temperate rangelands of kashmir and caused the soil compaction, soil structure degradation and loss of soil organic c and c/n ratio. soils from three grazing intensities were investigated...

The purpose of developing a fertility program is to ensure that adequate levels of nutrients are available for plant uptake in support of the yield potential for the climatic, plant genetic, and soil environmental factors impacting plant growth in any given field. A regular soil sampling program is the best way to obtain the information necessary to develop such a fertility program. An occasion...

If the rate of bedrock conversion to a mobile layer of soil depends on the local thickness of soil, then hillslopes on uniform bedrock in a landscape approaching dynamic equilibrium should be mantled by a uniform thickness of soil. Conversely, if the depth of soil varies across an actively eroding landscape, then rates of soil production will also vary and, consequently the landscape will not b...

Semi-arid regions are under high pressure to supply the required food for their rapidly-increasing populations. This, together with the harsh climatic conditions and changes in land use accelerates land degradation processes, which eventually leads to yield reduction. Conventional sensor systems provide data in only a few spectral bands, which can be, to a given extent, used to model the reflec...

Cryosols cover approximately 18 x 10 km, or about 13% of the Earth’s land surface. They occur in the permafrost zones in both the Northern Hemisphere and Antarctica as well as in some alpine regions. Cryosols are of global concern since it is predicted that both Polar Regions will experience a significant increase in average temperature. The primary concern, however, is the impact that global w...

The fertility of a soil classically refers to an aptitude to produce plant biomass, under a given set of climatic and topographic conditions; it therefore contributes to an ecosystemic supply service (MEA, 2005). It is generally subdivided into three components – chemical, physical and biological – which are closely linked (Genot et al., 2009). The chemical component describes the ability of th...

Wildfires and harvesting are important disturbances to forest ecosystems, but their effects on soil microbial communities are not well characterized and have not previously been compared directly. This study was conducted at sites with similar soil, climatic, and other properties in a spruce-dominated boreal forest near Chisholm, Alberta, Canada. Soil microbial communities were assessed followi...

Rhizobia are bacteria that can fi xate atmospheric nitrogen in association within the root or the stem nodules of legume plants and transform atmospheric nitrogen to ammonia. Soil environmental conditions are critical factors for the persistence and survival of rhizobia in the soil. Th e changes in the rhizosphere environment can aff ect both growth and saprophytic competence, which will infl u...