Re-evaluation of land capability and land suitability classification for Philippines
1990
Perez, F.O. (Central Luzon State Univ., Munoz, Nueva Ecija (Philippines). Dept. of Soil Science)
This study attempted to modify the existing system of land capability classification of the Philippines by re-evaluation and establishment of the basic factors used for capability assessment, quantification of land use requirements, definition of the limits of soil parameters used as criteria for crop suitability and identification/description of soil conservation measures suited for each land capability class. The proposed system has 14 capability classes grouped into arable-classes A, B, C, Dm, Dh, La, Lb, Lc, Ld, and non-arable lands-classe. Lp. M, N, X, and Y. Class L, a non-arable and pasture land in the old system was converted into arable class to accommodate paddy rice cultivation. Using frequency or duration and depth of flooding and stoniness as factors of assessment in rice soils. Class La ranks the best while Class Ld is the worst. Likewise, Class D was divided into two classes using mechanization as the main criterion. Class Dm lands are those at lower slope class where machines can be used for tillage operations while Dh lands are hand cultivated since they are at upper slopes. Classes A, B, C, M, N, X, and Y are more or less the same as the old system, only that limits of the soil parameters used were defined quantitatively in the same manner as the proposed classes. Lastly, arable classes were extended to higher slopes to meet the high demand of land for cultivation and to cope with the pressure of high population.
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