Effects of cultivation and cropping systems on some properties of selected soils in Cagayan Province [Philippines]
1987
Sunio, E.M.
Cultivation decreased the soil organic matter, capillary porosity, exchangeable Ca and pH. Cultivation decreased organic matter content of Avingua clay loam cropped with HYV rice-rice and Toran silty clay cropped with HYV rice-fallow and Toran silty clay cropped with traditional rice-fallow but increased in Carig loam cropped with HYV rice-rice and Alaminos clay loam cropped with HYV rice-fallow. The increase in organic matter content of the said soils was attributed to rice residue incorporation and slow decomposition during submergence. Cultivation of Tuingua clay loam and Carig loam with rice-rice cropping enhanced acidification and decreased exchangeable Ca. Cultivation of Toran silty and Alaminos clay loam with rice-fallow cropping decreased exchangeable K. Rice-based cropping systems such as rice-rice, rice-fallow and rice-mungbean had greater soil organic matter than corn-based cropping systems such as corn-peanut, corn-fallow and corn-tobacco. The higher organic matter content of the rice-based cropping system was attributed to the incorporation of rice residue during land preparation and slow decomposition during submergence. For maintaining soil organic matter, the HYV rice-rice cropping with fertilization and the corn-tobacco cropping were best in their respective group. Rice-mungbean cropping decreased soil organic matter and compacted the soil. Corn-fallow cropping slightly increased organic matter but enhanced leaching of exchangeable bases during fallow period. Corn-tobacco had higher organic matter content, greater exchangeable bases and lower bulk density than all other corn-based cropping systems.
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