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Structure of a Dunkirk Silty Clay Loam in Relation to pF Moisture Measurements 1
Author(s) -
Jamison Ver C.
Publication year - 1942
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1942.00021962003400040002x
Subject(s) - gratitude , loam , relation (database) , library science , citation , psychology , operations research , computer science , mathematics , geology , soil science , social psychology , data mining , soil water
F many years soil scientists have tried to give quantitative expression to structural differences in soils. Dry and wet sieve aggregate analyses have proved helpful, but some soils may be quite similar in aggregate size. frequencies and show marked differences in states of packing, and hence in aeration and permeability. Fruitful studies have been made on soil porosity. Since large pores are important in allowing for good aeration and drainage and fine pores in holding stored moisture, methods are used for determining the "noncapillary" and "capillary" porosities, but the pore space in all soils is not separable into two distinct categories. In our laboratory and elsewhere technics have been used that give pore size distribution information. In this work, undisturbed soil samples were taken from the same .soil type. Complete pP moisture relations were plotted from tension, centrifugal, and vapor pressure data. The derived pore size distributions were studied statistically to bring out significant differences related to field treatments and crop yields. Crop responses often seem to be more related to physical variations than to fertility levels of the soils involved. This experiment was planned to give some quantitative expression to such differences and to test the application of pore size distribution methods to the practical study of field soils.