The Philippine journal of science . iver. This typeof soil differs very materially from any that has been described. Thesurface is mainly of light loamy nature underlaid by a stratum of sandof various grades. On account of the porosity of the soil and the topog-raphy of the land, a large quantity of water will be needed for riceculture. These soils were unquestionably all formed in the same way,but natural and artificial means have caused great variations intheir physical properties and fertility. With reference to theirphysical properties as indicated by field observations, reports
The Philippine journal of science . iver. This typeof soil differs very materially from any that has been described. Thesurface is mainly of light loamy nature underlaid by a stratum of sandof various grades. On account of the porosity of the soil and the topog-raphy of the land, a large quantity of water will be needed for riceculture. These soils were unquestionably all formed in the same way,but natural and artificial means have caused great variations intheir physical properties and fertility. With reference to theirphysical properties as indicated by field observations, reports with regard to classification and drainage asfollows: Class I.—This class includes all the lands within the vicinity of Villasisand Urdaneta. The soil is classified as first class for rice, as it has alarge water-holding capacity and is of sufficient depth to give ample room ** An unpublished report made in 1910. 26 The Philippine Journal of Science 1914 KrrUpatrcck Vill OIL MAP L.\NGAN-DALIN, PaNGASINANrveyed 1909or Public Works. To Santo Maria To Manooaj Urdaneta ScaleKilometers Villasis^ Clay Loamand Gravel ;—im Fine Silt,and Sand To Rosoizs Soil Sample Fig. 2. Soil map of Ambalantran-Dalin, Pangasinan. IX, A, 1 Cox and Argiielles: Soils of Luzon 27 for root growth. These are two essential factors for proper rice soils of this class are remarkably uniform in character (see map).From data obtained during the high flood of July last, it is evident thata large percentage of fine silt is deposited on this land annually fromthe Agno River. The silt is beneficial as it improves the texture andsupplies a certain percentage of plant food. The following analysis showsthe percentage of fertilizing elements in river sediment. (See AppendixI.) Class II.—This class includes all the land within the municipality ofAsingan. This soil has been classified as second class for rice, on accountof its texture being open, which allows the escape of a certain percentageof free wat
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1906
