Soil translocation by tillage may be an important factor in land degradation in the humid tropics. The objective of this study was to evaluate tillage-induced soil translocation on an Oxisol with 25% and 36% slopes in Claveria Philippines for three tillage systems: contour moldboard plowing (CMP) moldboard plowing up and downslope (UMP) and contour ridge tillage (CRT). Small rocks 3–4 cm in “diameter” were used as soil movement detection units (SMDU). The SMDUs were placed at 10 cm intervals in a narrow 5-cm-deep trench near the upper boundary of each plot the position of each rock recorded and the trench backfilled. Five tillage operations used to produce one corn crop were performed during a one month period: two moldboard plowing operations for land preparation (except for CRT) one moldboard plowing for corn planting and two inter-culture (inter-row cultivation) operations. After these operations over 95% of the SMDU were recovered manually and their exact locations recorded. Mean annual soil flux for the 25% slope was 365 and 306 kg m−1 y−1 for UMP and CMP respectively. For the 36% slope comparable values were 481 and 478 kg m−1 y−1. Estimated tillage erosion rates for the 25% slope were 456 and 382 Mg ha−1 y−1 for UMP and CMP respectively and increased to 601 and 598 Mg ha−1 y−1 respectively for the 36% slope. The mean displacement distance mean annual soil flux and mean annual tillage-induced soil loss for both slopes were reduced by approximately 70% using CRT compared to CMP and UMP.
00040-9&apiKey=3948bb216041dbffcb29a618defafc29&httpAccept=image%2Fjpeg)
DOI:
http://dx.doi.org/10.1016/S0167-1987(99)00040-9Altmetric score:
Dimensions Citation Count:
Publication year
1999
Authors
Thapa, B.B.; Cassel, D.K.; Garrity, D.P.N.
Keywords
Animal agriculture, Ridge tillage, Soil erosion, Humid zones, Oxisols, Conservation tillage, Soil
