Hydrologic and edaphic behavior of Sloping Agricultural Land Technology (SALT 1) in Marilana Watershed reservoir
1996
Atega, P.C. (Ecosystems Research and Development Bureau, 4031 College, Laguna (Philippines). Coastal Zone and Freshwater Ecosystems Research Div.)
Factors influencing SALT [Sloping Agricultural Land Technology] practices were evaluated in terms of hydrologic and edaphic variables. Results showed that the long term average rainfall over the watershed area was 3,078 mm, while rainfall in the study area was 3,465 mm. Surface runoff and sediment yield were highly correlated with rainfall deriving an R2 value of 0.95 and 0.94, respectively. Surface runoff and sediment yield are likewise highly correlated (R2=0.96). Revive erosion rate occurred when there is high surface runoff rate and long duration of wet periods. The annual sediment yield of 180 tons/ha/yr was far above the standard range of soil tolerance value of 10 to 15 tons/ha/yr. On the other hand, the decrease of sediments over time can be attributed tothe influence of soil texture, change in the position of slope, and slope form. The general decreasing trend of organic matter, nitrogen, phosphorus, calcium, magnesium, sodium and potassium can be attributed to leaching due to high erosion rate and nutrient uptake by the plants. Several recommendations are given in this report
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