Validating equations to estimate subfactor ciii for corn residue cover

International Journal of Development Research

Volume: 
11
Article ID: 
23080
7 pages
Research Article

Validating equations to estimate subfactor ciii for corn residue cover

Sabrina da Silva Nascimento Sousa and Marcílio Vieira Martins Filho

Abstract: 

Erosion is one of the main causes of soil degradation. Model validation is a vital step in developing a valid and applicable tool to predict soil erosion. The aim of this study was to evaluate models that predict the cover and management subfactor (CiII) for interrill erosion. A full factorial design was used, with five doses of corn residue (0; 0.05; 0.15; 0.40 and 0.80 kg m-2), four slope gradients (5.2%; 10.6%; 15.3% and 36.4%) and two repetitions, under simulated rainfall. Di and the CiII were assessed in 0.5 x 0.75 m experimental plots, with recently tilled soil. Soil loss at a 5.2% slope gradient with no soil cover was 458.30 kg ha-1, which could be lowered to 67.13 kg ha-1 by using 90 % cover with corn residues. The soil lost in the treatment without cover at a 36.4% gradient could be reduced 7 times by adopting 90% soil cover. The equations CiII = e -2.50 CS/100, CiII = e –2.33 CS/100 and CiII = e –2.238 CS/100 generated good estimates for CiII, despite overestimating the subfactor in relation to the actual values recorded. The results also demonstrated that corn stover is effective at reducing interrill erosion.

DOI: 
https://doi.org/10.37118/ijdr.23080.11.2021
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