Inorganic copper is used as a broad-spectrum fungicide and bacteriocide on a variety of agricultural crops. After application, the copper residue typically accumulates in the upper 15 cm of soil. Data from the California Pesticide Use Reports were used to estimate the augmentation of copper in the soil that resulted from pesticide applications for the six years from 1993 to 1998 on 12 crops tha...

to assess the effects of different levels of nitrogen and phosphorous on yield and nutrient use efficiency of sugar beet (polygerm seed (cv. 7233)), this study was carried out in 1999-2001 in ardabil agricultural research station (alarough). the experiment contained two factors of: nitrogen in 4 levels (control, 100, 200 and 300 kg n/ha) and phosphorous in 3 levels (control, 100 and 200 kg p2o5...

the objective of this work was to study the effects of tillage and liquid manure applications on some physical and chemical properties as well as on the carbon and nitrogen mineralization potential of a meadow soil. our results indicated that tillage and manure applications had no effect on the concentration of cu, mn, total n and organic c in 0-15 cm layer of soil after 15 years of treatment. ...

FT-IR, UV-visible, and X-ray diffraction analyses were used to investigate the nature of organic matter in three fractions of soil humic substances (humin, HU; humic acid, HA; and fulvic acid, FA) extracted at a depth of 0–10 cm from the soil under rye grass (Lolium perenne) culture. FT-IR and XRD analyses showed that the extracted HAs still contained the clay matrix, but the extracted FAs, whi...

Terminated small grain cover crops are valuable in light textured soils to reduce wind and rain erosion and for protection of young cotton seedlings. A three-year study was conducted to determine the impact of terminated small grain winter cover crops, which are hosts for Meloidogyne incognita, on cotton yield, root galling and nematode midseason population density. The small plot test consiste...

High grazing intensity and wide-spread woody encroachment may strongly alter soil carbon (C) and nitrogen (N) pools. However, the direction and quantity of these changes have rarely been quantified in East African savanna ecosystem. As shifts in soil C and N pools might further potentially influence climate change mitigation, we quantified and compared soil organic carbon (SOC) and total soil n...