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  • Articles  (56)
  • Cambridge University Press  (35)
  • Canadian Science Publishing  (21)
  • American Geophysical Union
  • American Institute of Physics
  • 1980-1984
  • 1970-1974  (56)
  • 1965-1969
  • 1935-1939
  • 1971  (56)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (53)
  • Archaeology  (3)
Collection
  • Articles  (56)
Source
Publisher
Years
  • 1980-1984
  • 1970-1974  (56)
  • 1965-1969
  • 1935-1939
Year
Journal
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  • 1
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    ACCURACY OF FIELD SAMPLING FOR SOIL TESTS (1971)
    Canadian Science Publishing
    Details
    Publication Date: 1971-06-01
    Description: Three widely separated Alberta fields were sampled intensively in a grid pattern, to estimate the effect of number and depth of cores and of field size on the accuracy of composite samples used in soil test analyses. Estimates were obtained by both statistical and computer simulation techniques and both gave similar results. Accuracy of composites increased with the number of cores, but even with as many as 30 cores per field there was still considerable inaccuracy in values for N and P. In the most variable field, a composite of 20 cores for the 0- to 15-cm depth predicted the true field mean within ± 10% for N, P and K only 47, 56, and 82 times out of 100, respectively. Corresponding values for the least variable field were 77, 70, and 98. Conductivity and pH were more accurately estimated with the same number of cores. Samples taken at the 15- to 30-cm and 30- to 61-cm depths showed greater coefficients of variability in N and P than did samples from the 0- to 15-cm depth. However, samples composed of the 0- to 30-cm and 0- to 61-cm depths were similar to the 0- to 15-cm depth in variability. The number of cores needed for a given level of accuracy increased very little with size of field, up to a maximum of 40 hectares used in this study. Degree of variation changed considerably from field to field, but even more from one position to another within the same field.
    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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  • 2
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    LONG-TERM PERSISTENCE OF BHC, DDT AND CHLORDANE IN A SANDY LOAM SOIL (1971)
    Canadian Science Publishing
    Details
    Publication Date: 1971-10-01
    Description: Residues of technical BHC, DDT and chlordane present in a sandy loam soil in Nova Scotia 15 years after the last application were 7.5, 55 and 16%, respectively, of the amounts applied. BHC residues consisted of the alpha-, beta-, gamma- and delta-isomers at relative percentages of 36, 36, 16 and 12, respectively. The beta isomer was the most persistent. DDT residues consisted chiefly of p,p′-DDT, o,p′-DDT and p,p′-DDE. Residues in chlordane-treated plots were principally alpha- and gamma-chlordane. There was little downward or lateral movement of these insecticides in the soil in 15 years.
    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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    The effect of different stocking rates on the weight gain of Ankole steers on natural grassland in Western Uganda (1971)
    Cambridge University Press
    Details
    Publication Date: 1971-02-01
    Description: SUMMARYStocking rates of 3, 6 and 9 acres per 2- to 3-year old steer on Acacia-Cymbopogonj Themeda complex pasture in Ankole, Uganda, demonstrated that 3 acres per head gave significantly lower individual live-weight gains, but that there was little difference between 6 and 9 acres over a 6-year period. Although cattle grazed at 3 acres averaged only 175 lb per head per annum, compared with 207 lb at 6 acres per head, the income was Sh. 34 per acre compared to only Sh. 20–50 at 6 acres per head. At 9 acres/head the return was Sh. 13–50 an acre.A comparison of a 2 paddock/1 herd system with continuous grazing revealed no differences in production, despite the heavier capital investment involved in the former system. Growth rates at all three stocking rates were similar for most of the year, but in the dry season when all the cattle lost weight those stocked at 3 acres per head suffered the greatest losses (50–60 lb) and those at 9 acres per head the least (20–30 lb).
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Cambridge University Press
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  • 4
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    Yield, nutritive value and ensiling characteristics of whole-crop spring cereals (1971)
    Cambridge University Press
    Details
    Publication Date: 1971-06-01
    Description: SUMMARYThe dry-matter yield, in vitro digestibility and crude protein content of four varieties of spring cereals (one barley, one wheat and two oats) were examined at weekly intervals at two levels of nitrogen fertilization during two successive years. The ensiling characteristics of crops cut at two dates were also determined. Dry-matter yields increased until the end of July. Digestibility and crude protein content declined until mid July when values of 56–60 and 6–7% for the barley and wheat, and 53–55 and 5–6% for the oats respectively were maintained. Crops of all varieties were suitable for ensiling at maximum yield.Other experiments investigating level of whole-crop cereal yields obtainable with higher levels of fertility produced yields of over 16 metric tons D.M./ha with applications of 200–250 kg N, P2 O5 and K2O per hectare.
    Print ISSN: 0021-8596
    Electronic ISSN: 1469-5146
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Cambridge University Press
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  • 5
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    SELENIUM DETERMINATION IN SOIL AND PLANT MATERIALS (1971)
    Canadian Science Publishing
    Details
    Publication Date: 1971-02-01
    Description: Selenium (Se) was determined in soil and plant samples after wet digestion with HNO3 and HClO4. The method included the usual steps, namely, the reduction of Se, complexing Se with 2,3-diaminonaphthalene, and the extraction of the piazselenol in cyclohexane followed by fluorometric measurements. The most important step, the stabilization of selenium at the oxidative state Se+4, was achieved by reducing Se+6 to Se+4 with 2 ml of 1 N HCl while the system was kept in a boiling water bath. For best results and adequate control of interfering ferric ions, the system was adjusted to pH 1.8, and a stabilizing agent consisting of 10% hydroxylamine hydrochloride in a 0.04 M EDTA solution was used. Fluorescence measurements obtained for soil samples gave average coefficients of variation and recovery percentages of 3.35 and 97.4, respectively. For radioactivity counts made on cyclohexane extracts, the coefficients of variation and the recovery percentages were 2.31 and 93.1, respectively. Similar results were obtained for plant materials. Major problems encountered in establishing the modified method are discussed.
    Print ISSN: 0008-4271
    Electronic ISSN: 1918-1841
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 6
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    NITRATE REDUCTION, AND REDOX POTENTIALS MEASURED WITH PERMANENTLY AND TEMPORARILY PLACED PLATINUM ELECTRODES IN SATURATED SOILS (1971)
    Canadian Science Publishing
    Details
    Publication Date: 1971-02-01
    Description: The influence of nitrate-nitrogen on the redox potential measured with permanently and temporarily placed bright platinum electrodes was studied in samples of the Ap, BA and Bt horizons of a Huron silty clay loam in the laboratory. An anaerobic condition was induced by saturating the soils with distilled water. Redox potentials measured with the temporary Pt electrodes decreased with time to about −300 mv, but they were temporarily poised at +200 mv when NO3 was present. Similar results were obtained for untreated soils and for soils treated with 200 ppm NO3-N when measurements were made with the permanent Pt electrodes. With a second addition of 200 ppm NO3-N, the potential measured with the permanent electrodes increased approximately from −300 mv to −200 mv and remained poised at this potential for the duration of the experiment. The Eh values measured with the temporary electrodes increased to +200 mv and remained there temporarily until the NO3 disappeared, and then decreased to −300 mv again. The poising of the permanent electrodes at approximately −200 mv was attributed to the occurrence of chemical reactions at the platinum surface resulting in a reduction of the electrical conductivity or responsiveness of the electrodes.
    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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    USE OF QUARTZ, ZIRCONIUM AND TITANIUM AS INDICES IN PEDOLOGICAL STUDIES (1971)
    Canadian Science Publishing
    Details
    Publication Date: 1971-10-01
    Description: Four soils, two of which had developed from deposits with visible unconformities, served as a basis for evaluating the use of quartz, ZrO2 and TiO2 as resistant indicators in pedological studies. Contents and ratios of these components for individual size fractions, the total non-clay fraction, and the total soil were compared. Values for individual fractions serve to differentiate and characterize underlying geological strata; changes in particle size distribution and clay translocation within solum horizons necessitate the use of the total non-clay fraction for establishing the original uniformity of soil deposits. Both quartz and zirconium are reliable indices upon which to base quantitative evaluation of pedogenic changes when the total 〉 2 μ fraction is used, providing that original uniformity of the soil deposit has been established. The mobilization of titanium in all fractions during soil weathering limits its usefulness in this regard. Except for the surface layers, in which anomalous zirconium values were obtained, quartz and ZrO2 provided similar values of calculated losses and gains within horizons of the Orthic Gray Luvisol studied. Significant changes in particle size distribution resulting from physical breakdown in the A horizon, as well as clay translocation and formation within the solum, were recorded.
    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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    Pertes d'azote par volatilisation ammoniacale après fertilisation en forêt de pin gris (1971)
    Canadian Science Publishing
    Details
    Publication Date: 1971-06-01
    Description: In a field study, percentage of nitrogen lost as ammonia from a jack pine (Pinusbanksiana Lamb.) soil increased with increasing rates of urea application between 112 and 448 kg N/ha. After 7 days, losses amounted to 18–28% of a 224 kg urea-N/ha application, representing 60–87% of the total losses measured over a 6-week period. Maximum volatilization rates occurred between the third and the fifth day after fertilization, at which time urea hydrolysis was virtually complete. Negligible ammonia losses were measured in plots treated with ammonium sulfate, ammonium nitrate, and sulfur-coated urea. Applying superphosphate with urea markedly depressed ammonia volatilization, an effect which was enhanced by a joint application of K2SO4•MgSO4. Reduction of volatilization by artificial precipitation was significant and increased with increasing precipitation when the latter was applied soon after fertilization; decreases in volatilization were then related to the amount of residual urea subject to diffusion into the humus layer or to leaching towards the underlying soil horizons.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 9
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    Effect and Characteristics of Pathogens on Foliage and Buds of Cold-Stored White Spruce and Lodgepole Pine Seedlings (1971)
    Canadian Science Publishing
    Details
    Publication Date: 1971-12-01
    Description: Molding of cold-stored, spring-lifted seedlings of Piceaglanca (Moench) Voss var. albertiana (S. Brown) Sarg. reached an index of 71.7 and of Pinuscontorta Dougl. var. latifolia Engelm. an index of 35.6 during 10 weeks of storage. Mortality and reduced growth after planting out were directly related to the degree of molding. Of 37 fungus species isolated from moldy seedlings, 10 were considered significant and were further studied. All 10 grew at 5 °C and eight of them grew at 0 °C. All 10 were able to infect moist foliage at 2 °C, but only Epicoccumpurpurascens Ehrenb. ex Schlecht. could infect dry foliage, and then only at 95% r.h. Storage at 0 °C reduced molding to less than one-half that at 25 °C. Suitable seedling storage methods are discussed.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 10
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    Estimating Weights of Tree Components of Lodgepole Pine from Large-Scale Aerial Photographs (1971)
    Canadian Science Publishing
    Details
    Publication Date: 1971-09-01
    Description: Sixty-three lodgepole pine (Pinuscontorta Dougl. var. latifolia Engelm.) trees were measured on the ground, felled, and their crowns and stems were weighed. The combined independent variables of tree height and crown width gave the most precise estimate of fuel components. No significant differences were found between ground and air photo measurements of total tree height and crown width. Hence, the weight of all branchwood, entire crown, and entire tree can be estimated by the use of large-scale aerial photographs.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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