But in many annual production systems these functions are compromised by tillage that diminishes soil organic matter and creates compaction, ultimately restricting crop growth while increasing susceptibility to drought, erosion, and nutrient losses.
Acidic southern brown earths (leading to restricted crop choice) are prevalent on the crystalline rocks of the western Meseta, and gray, brown, or chestnut soils have developed on the calcareous and alkaline strata of the eastern Meseta and of eastern Spain in general.
Salinity is one of the most severe environmental factors that greatly impacts plant development and restricts crop production.
Depending on landscape structure such as field sizes, field distribution and cropping patterns, these measures may spatially restrict GM cropping.
If Vilsack had been hoping to restrict GE crops, the timing could not have been worse.
The cocaleros have pledged to restrict their crops to authorised areas, but also voluntarily to reduce the amount of land used.
While too short distances may not guarantee safe coexistence, too large distances may inappropriately restrict GM cropping.
Dietary changes leading to increased childhood obesity may be driven by changes in climate that promote or restrict agricultural crops such as fruits and vegetables; government policies; and concentration of food production, distribution, and marketing in the hands of large corporations.
The first approach restricts energy crop production to less productive, degraded, marginal or abandoned agricultural land to minimise the LUC effects including iLUC [40, 44 46].
To redefine the idea of restricting energy crop cultivation to less productive land, we have adopted some definitions by Shortall [46].
