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Water management effects on birdsfoot trefoil seed productionGarc��a-D��az, Carlos Alberto 13 June 1997 (has links)
There is no information available on water management of birdsfoot
trefoil grown for seed. Information is also not available describing how to
minimize seed losses due to shattering in order to obtain consistently high
birdsfoot trefoil seed yields. The objectives of this research are to: (i) quantify
crop water use, effects of soil-water availability and optimal water management
conditions for birdsfoot trefoil grown for seed, (ii) determine the effects of
irrigation timing and amount on flower production, seed yield, and yield
components, and (iii) quantify the effects of soil-water availability on seed
shattering and determine optimal harvest time to reduce seed yield losses due
to shattering. Five supplemental irrigations treatments and a non-irrigated
control were applied in 1994 and 1995; in 1996, only treatments low stress and
non irrigated control were investigated, near Corvallis, OR on a Woodburn silt
loam soil (fine-silty, mixed, mesic Aquultic Argixeroll).
Increasing amounts of applied water increased seasonal ET[subscript c] with low
stressed plants having the greatest ET[subscript c] and non-irrigated control plants the
least. The fraction of available soil-water used was primarily dependent upon
the irrigation depletion percentage and secondarily dependent upon irrigation
replacement amount. Soil-water conditions favorable for vegetative
development and seed yield water use efficiency are opposite. Birdsfoot trefoil
grown for seed requires minimal or no supplemental irrigation. For non-irrigated
conditions, the crop water requirement ranges from 240 to 255 mm.
In the first year of production, plants under low-stress conditions
sustained flowering longer than with limited or no irrigation applications.
Flowering was not affected by irrigation in subsequent years of production.
Total above-ground phytomass production was correlated with the amount of
applied irrigation water (r=0.92). Umbel density and number of seeds per pod
are the primary determinants of total seed yield (r=0.77 and 0.92,
respectively).
Manipulation of the reproductive development pattern by different water
application times and amounts does not affect peak seed shattering events.
Crop-water stress status affects the percentage of total shattered seeds
shattered at harvest time (r=-0.76). Increasing amounts of applied water
increase the percentage of potential shatter losses that will shatter by harvest
time (r=0.65). Seed shatter losses fluctuate during the reproductive
development period but are not influenced by the water application treatments.
Climatic variables as measured in this experiment cannot be used to predict
the time of peak seed shatter events. A total of 109 heat units are needed from
the time from initial pod dehiscence until rapid shattering occurs. / Graduation date: 1998
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Crossing behavior, RAPD analysis and chlorophyll flourescence in relationship to the geographic adaption of birdsfoot trefoil (Lotus corniculatus L.)Garc��a de los Santos, Gabino 18 August 1997 (has links)
Birdsfoot trefoil (Lotus corniculatus L.) is a popular perennial, non-bloating forage legume used for pasture, hay and silage throughout the temperate regions of Europe, Asia Minor, North Africa and North and South America. It is regarded as the most morphologically and biochemically variable species in the genus. Research investigating the relationships of morphological, ecological and genetic characteristics describing birdsfoot trefoil germplasm has not been done. This research was conducted to investigate if the geographic and ecological origins of birdsfoot trefoil genotypes are related to differences in: (i) crossing compatibility among diverse genotypes, (ii) morphological traits, (iii) PCR-RAPD banding patterns, and (iv) temperature response of chlorophyll Photosystem II variable fluorescence. The 28 genotypes were classified by morphological characteristics, 130 polymorphic random amplified polymorphic DNA bands, and eight ecological characteristics of the original collection sites. The ease of introgressing 27 exotic genotypes into other germplasm backgrounds was determined by using bidirectional crosses with a domestic and exotic genotype tester. The chlorophyll fluorescence transients ratios (FTR) were determined from eight
genotypes that were selected by their ecological diversity with measurements
made from 10 to 40��C in 5��C increments for 33 minutes from the time of initial
dark adaptation in 3 minute increments.
Morphological similarities among genotypes were related to the general geographic proximities of their collection sites and their genetic similarity based on RAPD markers. Utilizing genetic, morphological and ecological descriptions revealed combinations of variation among genotypes that would not be observed with single measurements. Incompatibility among crosses was
expressed as either an inability of plants to set pods or F��� progeny resulting from crosses producing inviable pollen. Reproductive barriers were environmentally neutral and randomly distributed through the among the genotypes. Intermediate crosses could be identified to bridge any combination of genotypes that were incompatible. The eight genotypes differed in their FTR responses and were grouped into two classes. However, no associations were found between genotype similarities by FTR with genetic or ecologic similarities. / Graduation date: 1998
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Some factors affecting seed production in birdsfoot trefoil (Lotus comiculatus L.).Badcock, Wilfred. January 1973 (has links)
No description available.
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The response to shade of two cultivars of birdsfoot trefoil (Lotus corniculatus L.).LeBlanc, Robert January 1981 (has links)
No description available.
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The establishment of birdsfoot trefoil as influenced by several environmental factorsBryant, H. T. January 1955 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1955. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 135-139).
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Influence of temperature on the seedling growth and chemical composition of three birdsfoot trefoil cultivarsGyurina, Mark E. January 1977 (has links)
Thesis--Wisconsin. / Includes bibliographical references (leaves 23-24).
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The response to shade of two cultivars of birdsfoot trefoil (Lotus corniculatus L.).LeBlanc, Robert January 1981 (has links)
No description available.
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Some factors affecting seed production in birdsfoot trefoil (Lotus comiculatus L.).Badcock, Wilfred. January 1973 (has links)
No description available.
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Selection for seedling vigor and a quantitative genetic analysis of agronomic characters in dialled crosses within and between two cultivars of birdsfoot trefoil (Lotus corniculatus L.)Khayrallah, Walid A. January 1979 (has links)
Note:
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Population dynamics of Birdsfoot trefoil in relation to disease and microclimate /Emery, Keith Martin, January 1997 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 1997. / Typescript. Vita. Includes bibliographical references (leaves 174-183). Also available on the Internet.
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