Soil productivity index of the CLSU [Philippines] reservation area
1998
Mactal, A.C.
Twelve delineated land mapping units (LMU) covering a total land area of 658 ha were evaluated for their productivity. All the land units fall at slope range 0-3 percent and generally belong to capability class 2 with moderate limitations. The low soil fertility and poor internal drainage were observed to be the most limiting land qualities to crop production. Land use requirements of ten crops were matched with the land characteristics and qualities of the various land units to evaluate their suitability. The soils were found to be highly suitable (S1) for wetland rice, while moderately suitable (S2) for cereals, legumes and vegetable crops. The inherent as well as the potential productivity of the different LMU's were determined. The soils from LMU 6 had the highest inherent productivity rating of 74.66 percent while the lowest was obtained from LMU 8 with 42.96 percent. The potential yield of different economic crops were predicted after implementation of soil improvement practices. The soils from MNU 6 and 7 had the highest predicted potential yield for all crops studied. The predicted potential yield of soil from LMU 6 was 7.35 t/ha for wetland rice, 4.92 t/ha for upland rice, 7.38 t/ha for maize, 4.1 t/ha for sorghum, 3.69 t/ha for ground nut, 2.16 t/ha for soybean, 7.39 t/ha for phaseolus bean, 56.13 t/ha for tomato, 38.86 t/ha for onion and 25.43 cu m log/ha for mahogany. Soils from LMU 7 had almost the same predicted potential yield as those registered from LMU 6. It can be deduced from the study that the productivity of the various land units can be improved through proper soil management practices which include judicious use of fertilizers, proper irrigation and drainage and proper cultural practices and management of the crops
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