[PDF] Nitrogen Fertilizer Rate And Application Timing Effects On Growth And Seed Oil Yield Of Meadowfoam eBook

Author : Michael L. McGahuey
Publisher :
Page : 132 pages
File Size : 27,52 MB
Release : 1985
Category : Nitrogen fertilizers
ISBN :

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Meadowfoam has been identified as a potential oilseed crop for production on poorly drained soils in areas with cool, moist winters. The effects of N fertilizer on meadowfoam (Limnanthes alba Benth.) have been studied in Oregon and Maryland, but the results have not been consistent with respect to the effects on oil yield: yields were reduced in most cases but significantly increased in another. Excessive lodging and incidence of fungal infection were associated with N fertilization in some studies. This study evaluated the effects of twelve combinations of N rate and timing on meadowfoam oil yields and on plant growth and development. Meadowfoam selection 703-A received 50, 100, and 200 kg N ha -1 applied in fall, winter, spring, and fall/spring application schedules (regimes). Each N treatment and the control were replicated four times in randomized complete blocks on the Hyslop Research Station of Oregon State University in Corvallis, Oregon. All N treatment means for seed and oil yield were greater than the control mean. Winter applications of N fertilizer increased the efficiency of fertilizer use, increased floral density, produced relatively early dry weight gains and flowering, and increased seed-oil content. Fall-applied fertilizer N responses were reduced by leaching losses, but it appeared that some quantity of N fertilizer should be applied in the fall and another application made in late winter (before March) for optimal seed-oil yields. Fall applications of slow-release forms of N should also be studied.

Author : Wade H. Shafer
Publisher : Springer Science & Business Media
Page : 386 pages
File Size : 17,10 MB
Release : 2012-12-06
Category : Science
ISBN : 1461573912

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Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated 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 activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thougtit 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 con cerned if the printing and distribution of the volumes were handled by an interna tional 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 Cor poration 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 31 (thesis year 1986) a total of 11 ,480 theses titles trom 24 Canadian and 182 United States universities. We are sure that this broader base tor these titles reported will greatly enhance the value ot this important annual reterence work. While Volume 31 reports theses submitted in 1986, on occasion, certain univer sities do re port theses submitted in previousyears but not reported at the time.

Author :
Publisher : John Wiley & Sons
Page : 336 pages
File Size : 13,45 MB
Release : 2020-11-10
Category : Science
ISBN : 1119716950

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Plant Breeding Reviews presents state-of-the-art reviews on plant genetics and the breeding of all types of crops by both traditional means and molecular methods. Many of the crops widely grown today stem from a very narrow genetic base; understanding and preserving crop genetic resources is vital to the security of food systems worldwide. The emphasis of the series is on methodology, a fundamental understanding of crop genetics, and applications to major crops.

Author : Ali Salih Gangi
Publisher :
Page : 118 pages
File Size : 47,15 MB
Release : 1984
Category : Grasses
ISBN :

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To increase efficiency of seed production, it is important to understand the effects of nitrogen (N) fertilizer rate and time of application. In particular, the effects on floret fertility should be examined since only a small proportion of florets actually produce harvestable seed. For these reasons, experiments were conducted in the field in 1981 and 1982 to study the effect of rate and time of nitrogen application at different growth stages on potential and actual seed yield and floret fertility. Specific effects of nitrogen on rate of floret filling in the top, intermediate and the bottom locations of the spike were observed. Two cultivars of perennial ryegrass were used in this study: Linn, an early maturing forage cultivar and Pennfine, which is a later maturing turf-type cultivar. Different nitrogen rates were applied at the vegetative phase, during spikelet initiation phase and at both stages. Nitrogen application increased the seed yield potential by increasing the number of fertile tillers per unit area and/or number of florets per spikelet. Nitrogen rate and time of application had no effect on floret fertility. Floret fertility percentage in all treatments were initially about 61%, but by final harvest had decreased to 20-32%. This reduction was likely due to loss of light seed during har vesting and cleaning. There was a slightly lower floret fer tility in the top compared with the intermediate and bottom location of the spike, but this was not affected by nitrogen rate or timing. Linn cultivar showed a higher rate of floret filling than the Pennfine; however, nitrogen rate and time of application showed no effect on rate of floret filling. Seed yield was affected by nitrogen application only in 1981, due to lodging, excessive vegetative tillering, and yield com ponent compensation. Results in this study do not support the hypothesis that management practices should be aimed at increasing head size rather than head numbers.