Effect of cropping pattern on soil erosion and surface runoff in the Agusan River Basin [Philippines]
1986
Castillo, E.T.
Results showed that cropping pattern A which includes crop planting of cassava, corn and camote was the most effective scheme in reducing surface runoff and sediment yield in the area. Total surface runoff was 764.41 liters for CPA (cropping pattern A) versus 867.63 liters for cropping pattern C (corn-camote-cassava) and 842.87 liters for cropping pattern B (camote-peanut-corn). Average surface runoff of CPA was 41.58% lower than the bare plot. Total sediment yield were: 621.36 kg/ha, 748.01 kg/ha and 740.44 kg/ha for CPA, CPB, CPC respectively. During the peak precipitation period which occurred during the third month of each cropping season, camote consistently produced the lowest surface runoff and sediment yield, closely followed by cassava. Both crops were found to attain a hundred percent relative cover before the peak rainfall set in while corn maintained 70% relative cover until the last month. Cropping pattern, cropping season and the interaction of cropping season and cropping pattern accounted most for the observed variation. The variation in surface runoff and sediment yield was largely explained by crop growth habits and sequencing of crops. With respect to productivity, obtained crop yield were very low compared to national average yield. This can be attributed to the poor soil physical and chemical properties which were observed to decline with time.
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