Investigations demonstrated that the conventional still has constrained productivity.
Poor availability of water and pastures has been identified as the single most important factor constraining productivity of livestock in Tanzania.
Societies with higher productivity have overcome to a greater degree whatever cultural, religious, ethnic, climatic, and political barriers have constrained productivity.
Water scarcity is a central issue constraining productivity in most grassland ecosystems [ 12, 29, 30, 35], and can drastically affect photosynthesis at various levels, from molecular through biochemical/physiological to individual aspects [ 3, 15, 22].
Structural factors, including low R&D, low quality of human capital, and elements of the regulatory-legal framework (cost of doing business) that constrain firm productivity growth likely contribute to the dismal evolution of productivity in Spain.2.
However, various diseases constrain their productivity.
In the upper Salmon River basin of central Idaho, the paucity of returning adult salmon and catchment scale nutrient deficits may constrain freshwater productivity and effectively limit efforts to recover salmon and steelhead populations.
Previous studies indicate that farmers' participation in marketing is constrained by productivity (Janvry et al. 1991; Fafchamps 1992), poverty, information, and physical constraints including road and storage facilities.
This suggests that canopy LAI is limited by water availability at the lower end of the rainfall spectrum and by cloud cover variability at the upper end, the latter regulating incident solar radiation on forest canopies and, hence, constraining vegetation productivity (Nemani et al. 2003).
