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  • Canadian Science Publishing
  • 1965-1969  (34)
  • 1960-1964  (6)
  • 1969  (34)
  • 1960  (6)
  • 1
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    THE EFFECTIVE STRESS RESPONSE OF A SATURATED CLAY SOIL TO REPEATED LOADING (1969)
    Canadian Science Publishing
    Details
    Publication Date: 1969-08-01
    Description: The results of a series of tests designed to examine the behavior of saturated clay soil under repeated loading are reported. Triaxial tests, under conditions of axial symmetry, were used and the rates of deformation were chosen so as to permit the accurate measurement of pore water pressure at all stages of the tests.It was found that, for any particular consolidation history, a critical level of repeated stress existed. Below this critical level, a state of nonfailure equilibrium was reached in which the stress-strain curves followed closed hysteresis loops. Above the critical level of repeated stress, effective stress failure occurred; and each cycle of loading produced cumulative increases in deformation.An interesting feature of the test results was that a linear relationship between the magnitude of the applied repeated stress and the increase in pore water pressure was found for stress levels below the critical value.
    Print ISSN: 0008-3674
    Electronic ISSN: 1208-6010
    Topics: Geosciences
    Published by Canadian Science Publishing
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  • 2
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    NITRATE-SUPPLYING POWER OF EIGHT GRASSLAND SOILS OF THE KAMLOOPS, B.C., AREA AND CORRELATION WITH RANGE FORAGE PRODUCTION (1960)
    Canadian Science Publishing
    Details
    Publication Date: 1960-02-01
    Description: The formation of nitrate in eight grassland soils of the Kamloops, British Columbia, area was studied using a laboratory incubation technique. All the accumulative totals of nitrate nitrogen produced by these soils were low and suggest that the amount of nitrate formed may be inadequate for optimum plant growth. The desert-like soils, although they are regarded as being members of the Brown great soil group, released the most nitrate nitrogen. The Shallow and Degrading Black soils released nitrate in intermediate amounts while the Brown and Dark Brown soils produced the smallest quantities. The correlations between the accumulative total of nitrate released during incubation with: C/N ratio, total nitrogen and organic matter, were not highly significant. Poor correlation was obtained in the comparison between the accumulative total nitrate formed and the forage produced during the period 1954–1957.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 3
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    RESIDUAL EFFECTS FROM FERTILIZER ON NATIVE RANGE IN SOUTHWESTERN SASKATCHEWAN (1969)
    Canadian Science Publishing
    Details
    Publication Date: 1969-06-01
    Description: Residual effects of fertilizer on native grassland throughout southwestern Saskatchewan persisted for six years or more, and were more important than the initial response. These residual effects resulted in yield increases and in increased phosphorus content of the forage. The sodium bicarbonate-extractable (available) phosphorus in the soil was increased by the use of phosphatic fertilizer; this increase persisted for six years after fertilizer application. The correlation coefficients between yield response and measured soil properties were not high for any of the measurements. The yield response was more closely related to the amounts of available N in the soil, the pH, and the texture than to the other soil and plant measurements. Responses were greatest on medium-textured soils, low in fertility and with a pH above 7.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 4
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    REACTIONS OF PHOSPHATE WITH ALUMINUM AND WYOMING BENTONITE (1969)
    Canadian Science Publishing
    Details
    Publication Date: 1969-06-01
    Description: Reactions between phosphate, Al and Wyoming bentonite in aqueous suspensions were studied under two conditions: (1) H3PO4 was added after interlayer hydroxy aluminum complexes had been formed by the addition of Ca(OH)2 to AlCl3 + bentonite suspensions; and (2) H3PO4 was added to AlCl3 + bentonite suspensions before the addition of Ca(OH)2. The suspensions were aerated and maintained at 25 °C.When H3PO4 was added after the formation of hydroxy aluminum complexes, the results were not significantly different from those when Ca(OH)2 was added to suspensions containing both AlCl3 and H3PO4. Phosphate was removed from solution and an interlayer hydrous aluminum phosphate was formed which increased the d(001) spacings of the bentonite. The amount of phosphate removed from solution increased to a maximum with increasing amounts of H3PO4 added and over this range there was no change in cation exchange capacity (CEC). Large amounts of H3PO4 increased the CEC of the bentonite. A major part of the reaction was completed within 24 hours and the values of pH changed only slightly from 1 to 120 days.Values of the (Al) (OH)2(H2PO4) ion product measured after aging for 14 days were larger than would have been maintained by crystalline variscite, but X-ray diffraction studies showed no evidence for formation of a separate crystalline phosphate phase.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 5
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    RELATIONSHIP OF YIELD AND TOTAL NITROGEN UPTAKE OF BRUSSELS SPROUTS PLANTS GROWN IN THE GREENHOUSE TO AVAILABLE SOIL NITROGEN (1969)
    Canadian Science Publishing
    Details
    Publication Date: 1969-10-01
    Description: Initial nitrate-nitrogen content of the soil gave a correlation coefficient (r) of 0.93 with yields and with total nitrogen uptake of Brussels sprouts plants (Brassica oleracea var. gemmifera DC., Jade Cross). Soil nitrogen extracted with 0.01 M NaHCO3 gave r values of 0.76 with yields and 0.75 with nitrogen uptake. Nitrate incubation results from leached, moist soil samples gave r values of 0.59 with yields and 0.56 with nitrogen uptake. However, air-drying of soil samples prior to leaching and incubation resulted in r values of only 0.15 and 0.11 with yields and nitrogen uptake, respectively. Available nitrogen determined by incubation without previous leaching of the soil samples gave high r values because of the influence of the initial nitrate nitrogen in the soil.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 6
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    THE SIGNIFICANCE OF LOCAL SOIL TYPES TO SOIL FERTILITY STUDIES (1960)
    Canadian Science Publishing
    Details
    Publication Date: 1960-08-01
    Description: Soil productivity data included in this study were obtained from field experiments laid down in areas of soil, characteristic of individual member profiles of catenary groups of the Weyburn and Oxbow Associations, and of a mapping complex comprising members of the Sceptre, Kindersley, and Flaxcombe Associations.The criteria used to assess soil productivity included the yield of gram with and without phosphorus and nitrogen fertilization, uptake of fertilizer phosphorus, 'A' values (from field and greenhouse experiments) and extractable phosphorus (NaHCO3 and H2CO3).The data illustrate the variability in yield and response to phosphorus fertilization that can be expected within relatively short distances in any one field in which complexity of soil pattern occurs. These differences in productivity were closely associated with pedogenic differences used to classify the soils.It was concluded that considerable care must be taken in the interpretation and application of fertility data obtained from small plot experiments as the data are applicable to only one particular soil type, in most instances the soil member on which the test was established; such data cannot be used to represent mapping units which include even closely associated soil types.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 7
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    THE EFFECT OF NITROGEN TOP DRESSING ON YIELD AND PROTEIN CONTENT OF NITROGEN-DEFICIENT CEREALS (1960)
    Canadian Science Publishing
    Details
    Publication Date: 1960-08-01
    Description: Top dressings of ammonium nitrate were made during the growing season to crops of barley and oats showing symptoms of acute nitrogen deficiency. The addition of nitrogen in the early stages of plant growth resulted in increased vegetative growth and increased yields. Applications of nitrogen delayed until the shot-blade stage had little effect on yield, but substantially increased the protein content. The yield of protein per acre was increased with higher rates of fertilization, regardless of whether the effect of the added nitrogen was to increase yield or protein content.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 8
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    EFFECT OF SOIL PROFILE TYPE AND FERTILIZER ON MOISTURE USE BY WHEAT GROWN ON FALLOW OR STUBBLE LAND (1969)
    Canadian Science Publishing
    Details
    Publication Date: 1969-06-01
    Description: Equations describing yield as a function of moisture use arc reported for fallow-seeded wheat for the years 1960 to 1965, inclusive, and for wheat seeded on stubble land from 1964 to 1967. In general, yields increased linearly with water use; second-degree functions did not greatly increase the correlation, but represent more realistic yield functions. The increase in yield per cm water used was larger on fallow than on stubble land, and increased with fertilization. Growing season precipitation ranged from 5 to 26 cm during the study period; the long-term average is 19 cm. Mean yields for unfertilized and fertilized fallow and stubble wheat were 1,500 and 1,860 kg/ha, and 1,340 and 1,720 kg/ha, respectively.Yield, water used, and water use efficiency varied somewhat, depending on whether the crop was grown on a knoll, upper slope, lower slope, or in depressional areas.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 9
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    CHEMICAL AND PHYSICAL PROPERTIES OF SOME SOILS DERIVED FROM REDDISH BROWN MATERIALS IN THE ATLANTIC PROVINCES (1969)
    Canadian Science Publishing
    Details
    Publication Date: 1969-02-01
    Description: Nearly all of the 16 soils from Nova Scotia and New Brunswick that were studied had Ae horizons, acid sola and dense, reddish brown parent materials, but they differed widely in the kind and the degree of B horizon development. Particle-size analyses supported the micromorphological observations in indicating that marked illuviation of clay had occurred in some soils, and weak illuviation in others. In a few soils it was difficult to estimate the extent of Bt horizon development as there were obvious discontinuities in the materials. Horizons having the chemical requirements of Podzol B horizons (Bf), significant accumulations of amorphous Al and Fe associated with organic matter, were found in only three of the soils. None of the soils had a Bft horizon; hence, the subgroup, Textural Podzol, should be eliminated. Bisequa development was evident in several of the soils and one was a Bisequa Podzol. Prominently mottled Bg horizons were the most obvious feature of the Gleysolic soils and some of them had Btg horizons. The bulk density of the fragipan in one of the soils was about 2.0, and many of the parent materials had equally high bulk densities. Free carbonates occurred at depths ranging from 60 to 180 cm in 12 of the 16 soils studied.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 10
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    CALCIUM RELEASE FROM 11 MINERALS OF FINE-SAND SIZE BY DILUTE SULFURIC ACID (1969)
    Canadian Science Publishing
    Details
    Publication Date: 1969-02-01
    Description: Equal volumes of 11 freshly-ground minerals of fine-sand size were weathered with dilute H2SO4 during 18 successive weekly periods. For most minerals an “early-weathered" and a "semi-weathered" stage were recognized in curves for calcium release, pH and conductivity. The semi-weathered stage provides a more correct basis for comparing calcium release among minerals than the early-weathered stage. Semi-weathered minerals released calcium in order of decreasing rates as follows: calcite, dolomite, apatite, bytownite, diopside, grossularite, labradorite, augite, hornblende, oligoclase and albite. Release of calcium is related to calcium content and structure of minerals.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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