Information
Level 4 Data summaries and links to related documents and reports (Capella)
Key Findings
The study found that wheat cropping had lower average annual runoff and soil loss than sorghum and sunflower. Zero and reduced tillage retained more crop stubble and had less soil loss than conventional tillage. The zero tillage wheat treatment had the lowest average annual runoff and soil loss, and conventional sunflowers had the highest.
Sallaway et al. (1988) found that projected cover post-harvest is a function of crop species and seasonal effects as expressed in grain yield, and was in the order wheat (90.3), sorghum (58.5) and sunflower (43.1). Projected cover was linearly related to grain yield.
Sallaway et al. (1990) found that the main factor affecting runoff volume was total rainfall, whilst peak runoff rate was mainly determined by rainfall intensity. The other variables had smaller, interactive effects. The major effects of the management practices were soil water deficit on total runoff and surface cover on peak runoff rate.
Key tables and figures extracted from data, literature and miscellaneous publications