Nitrogen, carbon and phosphorus mineralization in soils from semi-arid highlands of central Mexico amended with tannery sludge

Fertility islands around Prosopis laevigata and Pachycereus hollianus in the drylands of Zapotitlán Salinas, México

“…Consequently, the greatest quantity of cultivable bacteria was found in the root zone of mesquite, followed by P. hollianus, and then the control soils. This sequence is consistent with the islands of fertilitypromoting microbial growth (Barajas-Aceves and Dendooveen, 2001;Frı´as-Herna´ndez et al, 1999;Purohit et al, 2002). This trend was observed in both terraces, but was statistically significant only in the badlands.…”

Assessment of Tannery Waste in Semi-arid Soils Under a Simulated Rainfall System

“…However, the presence of sodium tends to disrupt the soil structure due to sodium being adsorbed and causing physical separation of soil particles, thereby allowing increased runoff and loss of solids (Hardy et al, 1983). A previous study conducted by Barajas-Aceves and Dendooven (2001) found that soils collected from outside the canopies of huizache (Acacia tortuoso L.) or catclaws (Mimosa biuncifera L.) in the same area as the soils evaluated in the present study (Dolores Hidalgo, Gto) had a higher available calcium concentration than soil that was collected from under the canopies of catclaws (20.9 and 2.1, 231.3, and 171.7 meq 100 g −1 dry soil, respectively). Downloaded by [University of New Mexico] at 05:33 14 October 2014 Table 3 Inorganic nitrogen concentration in runoff and infiltration solutions in semi-arid soils amended with tannery wastes and incubated for six months prior to being subjected to simulated rainfall Runoff Infiltration These findings suggest that Ca exchange may compete with Na concentration in soils present outside the canopy (Hanson et al, 2006).…”

Distribution and mobility of Cr in tannery waste amended semi-arid soils under simulated rainfall

“…The soils of arid and semi-arid regions in northern Guanajuato, Mexico have a low organic C content; therefore, they require organic amendments to improve their physical, chemical and biological properties to increase crop productivity and natural fertility [2,3]. Industrial disposal of tannery waste onto land has been a common practice worldwide because chromium in such wastes exists as Cr (III), which has relatively low toxicity and is easily precipitated and immobilized.…”