تلخیص
To elucidate the differences in clay measurements by various methods 28 soil samples were collected from Bhalwal (9), Miranpur (9) and research fields ofAyub Agricultural Research Institute (AARI) Faisalabad (10). The use of three different sets of soils made the study more comprehensive and wider application of the results. Three methods those of Pipette, Bouyoucos and Day's were utilized for the comparison of clay measurements. Considering the measurement of clay by Pipette method as standard, comparison of the clay measurements by Bouyoucos and Day's methods revealed an overall underestimation of clay as 11.04% by Day's method and 34% overestimation by Bouyoucos method relative to the standard Pipette method. Individually underestimation by Day's method is 14.4%, 11.41% and 7% in Bhalwal, Miranpur and AARI, soils respectively, whereas clay measurement by the Bouyoucos method were overestimated as 41%. 23% and 50% respectively in the above collections. The above results suggest the closest agreement of clay as measured by Day's method with that of standard Pipette method, it is, therefore, recommended that Day's method could be used as a standard method for soil texture determination in soils of low organic matter, such as those of Pakistan and other similar arid zone soils.
K. R. Arshad, , S. A. Shahid*, , K. A. Mufti*, ., UN Malik** , M. A. Malik* . (1994) TO MONITOR THE DIFFERENCES IN CLAY MEASUREMENTS BY VARIOUS METHODS, The Journal Soil & Environment , Volume 9, Issue (1-2).
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