Seasonal Distribution of Forage Production, N Concentration, and Mo Concentration in Subterranean Clover PDF Download
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Author: S. E. Petrie
Publisher:
ISBN:
Category : Clover
Languages : en
Pages : 104
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Book Description
Author: S. E. Petrie
Publisher:
ISBN:
Category : Clover
Languages : en
Pages : 104
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Book Description
Author: W. H. Shafer
Publisher: Springer
ISBN: 9780306409912
Category : Science
Languages : en
Pages : 328
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Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing. house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 25 (thesis year 1980) a total of 10,308 theses titles from 27 Canadian and 214 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. While Volume 25 reports theses submitted in 1980, on occasion, certain universities do report theses submitted in previous years but not reported at the time.
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 712
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Book Description
Sept.-Oct. issue includes list of theses and dissertations for U.S. and Canadian graduate degrees granted in crop science, soil science, and agronomic science during the previous academic year.
Author: Wesley M. Jarrell
Publisher:
ISBN:
Category : Subterranean clover
Languages : en
Pages : 182
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Book Description
Field studies designed to study residual effects from fertilizer molybdenum were initiated in September 1971 on established grass-clover pastures at ten sites in Western Oregon. Treatments were 0.0 and 1.12 kg molybdenum /ha on plots receiving 0-35-0-20S fertilizer (elemental sulfur-S) and 0.0, 0.56, 1.12 and 2.24 kg molybdenum /ha on plots receiving single superphosphate. Treatments were replicated four times in a randomized block design. Forage yields were measured during the spring in 1972 and 1973. Subterranean clover samples were analyzed for nitrogen, sulfur, copper and molybdenum. Yield response to applied molybdenum was noted on three harvests of seventeen; these responses were all on plots receiving single superphosphate. Clover nitrogen and copper levels were not significantly affected by molybdenum application. Form of sulfur fertilizer had a profound effect on molybdenum uptake by clover. On plots which received 1.12 kg Mo /ha, application of elemental sulfur (0-35-0-20S) produced plants much lower in molybdenum than did single superphosphate application. It was hypothesized that depression of Mo uptake resulted from one or a combination of the following phenomena: (1) a decrease in soil pH, (2) increased competition between sulfate and molybdate for absorption by the plant, and (3) increased leaching of molybdate due to the sulfate release pattern of the elemental sulfur material. Samples of the surface 10 cm of soil from each treatment were analyzed for anion exchange resin extractable molybdenum. Correlation between plant molybdenum and soil molybdenum was significant where all harvests were considered together, but the correlation was improved by separating soils into two groups. The soils in one of these groups were found to sorb large amounts of molybdenum, to release high amounts of hydroxyl anions on treatment with sodium fluoride, and to contain large amounts of amorphous and exchangeable iron compared with soils in the other group. Laboratory studies were carried on to investigate the molybdenum adsorption patterns peculiar to these soils. Surface samples were taken from eight of the field sites which showed a large range of molybdenum responses. Molybdenum solutions (0-20 ppm Mo in 0.01 M CaCl2) were allowed to equilibrate with soil at 25° C and the supernatant molybdenum concentration measured. Molybdate adsorption by soils was found to conform to the Freundlich adsorption isotherm in all instances. Four of the eight soils showed sorption patterns which followed the Langmuir adsorption isotherm at low equilibrium concentrations. The increase in solution hydroxyl concentration measured two minutes after mixing soil with 1 N NaF correlated significantly with molybdate adsorption at an equilibrium concentration of 0.03 ppm Mo. The fluoride ions may be reacting directly or indirectly with soil constituents responsible for molybdate retention. Iron extracted in ammonium acetate, pH 4.8, and ammonium oxalate, pH 3.3, correlated significantly with molybdate sorbed at an equilibrium concentration of 0.03 ppm, and with hydroxyls measured by the above sodium fluoride technique. Neither citrate-dithionite extractable iron nor aluminum in ammonium acetate and ammonium oxalate extracts were significantly correlated with molybdate sorption. Oxalate-extractable aluminum was significantly related to hydroxyls released with sodium fluoride. No correlation was found between laboratory measurements of molybdate retention by soils and the increases in clover molybdenum following molybdenum fertilization. It is suggested that several parameters not investigated in the present study such as soil moisture content, phosphate and sulfate levels, and the soil organic regime may affect rates of molybdate uptake into and translocation through the plant. Results indicate that it is difficult to predict the effect of molybdenum application on plant uptake of molybdenum in the field. A larger number of samples representing a vast range of soils appears desirable to reliably predict residual effects from applied fertilizer molybdenum.
Author: Harbans Singh Bhella
Publisher:
ISBN:
Category : Soils
Languages : en
Pages : 140
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Book Description
During the Spring of 1969, 47 surface soil samples (0 to 15 cm) as well as foliage samples of subterranean clover were collected from 32 selected western Oregon pastures, in an effort to determine their molybdenum status and to evaluate the use of anion exchange resin method as a means of assaying available molybdenum. The five most acid soils were limed to 80 percent base saturation. Greenhouse experiments were established during September, 1969, to evaluate the effect of molybdenum fertilization of subterranean clover yield and nutrient content. Highly significant yield and total nitrogen responses of subterranean clover were obtained following molybdenum fertilization. Greatest percent yield as well as percent total nitrogen responses to applied molybdate occurred at the lower soil anion exchangeable molybdenum concentrations. Statistically significant correlation coefficients were obtained between anion exchangeable soil molybdenum and percent yield response to applied molybdate in the greenhouse studies (r = -0. 743); anion exchangeable soil molybdenum and plant nitrogen concentrations in field subterranean clover samples (r = 0.875); anion exchangeable soil molybdenum and percent total nitrogen response to applied molybdate in the greenhouse studies (r = -0. 560); anion exchangeable soil molybdenum and plant molybdenum concentrations in field clover samples (r = 0.861); anion exchangeable soil molybdenum and soil pH (r = 0.861).
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 1272
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Author:
Publisher:
ISBN:
Category : Animal nutrition
Languages : en
Pages : 680
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Author: Andy Clark
Publisher: DIANE Publishing
ISBN: 1437903797
Category : Technology & Engineering
Languages : en
Pages : 248
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Book Description
Cover crops slow erosion, improve soil, smother weeds, enhance nutrient and moisture availability, help control many pests and bring a host of other benefits to your farm. At the same time, they can reduce costs, increase profits and even create new sources of income. You¿ll reap dividends on your cover crop investments for years, since their benefits accumulate over the long term. This book will help you find which ones are right for you. Captures farmer and other research results from the past ten years. The authors verified the info. from the 2nd ed., added new results and updated farmer profiles and research data, and added 2 chap. Includes maps and charts, detailed narratives about individual cover crop species, and chap. about aspects of cover cropping.
Author: Umesh C. Gupta
Publisher: Cambridge University Press
ISBN: 0521571219
Category : Science
Languages : en
Pages : 288
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Book Description
This book condenses all the information available on the subject of molybdenum as it relates to soils, crops and livestock.
Author:
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 556
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Book Description
