Texas, USA 2010 - International Herbage Seed Group

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Seed yield responses to climateR. Gislum a , U. Halekoh b & B. Boelt aa Aarhus University, Faculty of Agricultural Sciences, Department of Genetics and Biotechnology,Forsøgsvej 1, DK-4200 Slagelse, Denmark.b Aarhus University, Faculty of Agricultural Sciences, Department of Genetics and Biotechnology,Blichers Allé, DK-8830 Tjele, Denmark.Field data from more than 2000 farmers in the period from 2002 to 2006 has been used toanalyse how different climate conditions affect seed yield. The field data consists of differentcultivars of perennial ryegrass (Lolium perenne L.) grown at different soil types, in differentclimatic regions and using different management systems. The climate data consists oftemperature, radiation and precipitation and soil available water content was calculated. Climatedata used in the experiment was taken from 40 * 40 km grids in Denmark.The results showed that especially radiation up until harvest was a very important factor todescribe seed yield. There was a positive effect of higher radiation 1 to 5 weeks before harvestand the highest effect was the week before harvest. The results furthermore showed a negativeeffect of a high radiation during the winter, but a positive effect of high temperature in the sameperiod. The positive effect of high radiation shortly before harvest was not surprising. Thenegative effect of high radiation during the winter while there was a positive effect of hightemperature seems contradictory but might be explained by the effect of high temperature on soiltemperature.These results are interesting for the farmers as it shows the importance of taking the optimumharvest day. From a more scientific point of view, the results are important for the breeders as itshows that utilization of radiation in the ears should be the focus.177
Annual ryegrass seed production in acidic soilJ. M. Hart and M. E. MellbyeDepartment of Crop and Soil ScienceOregon State UniversityCorvallis, OR. USA 97331-3002john.hart@oregonstate.edu and mark.mellbye@orst.eduAbstractA three-year study of lime application for annual ryegrass seed production in Oregon, USA wascompleted in 2008. Lime application significantly increased the three-year average seed yield(p=0.05) on a field with an initial pH of 4.2. The average seed yield with no lime application was2815 kg ha -1 , compared to 3070 kg ha -1 for annual banded lime application of 165 kg ha -1 , 3050kg ha -1 when 5,600 kg ha -1 lime was applied preplant, and 3175 kg ha -1 when 11,200 kg ha -1 limewas applied preplant. KCl extractable aluminum (Al) increased exponentially as soil pHdecreased and seed yield increased linearly as KCl extractable Al decreased.IntroductionAnnual or Italian ryegrass (Lolium multiflorum Lam.) is grown on approximately 50,000 ha inthe southern Willamette Valley of Oregon, primarily on moderately and poorly drained acidicsoils. The soil pH in fields typically is below 5.5 (2:1 soil water), the value at which lime isrecommended. Annual ryegrass forage production studies in Texas, Louisiana, and Florida haveshown an increase in production when lime was applied to fields with a soil pH below 5.0,especially on sandy loam soils (Haby 1995). Despite acidic soil in western Oregon, seed yieldscomparable to or greater than the industry average (2,240 kg ha -1 ) are commonly obtained atstrongly acidic pH levels (
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Proceedings of the 7th Internationa
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Table of ContentsORAL PRESENTATIONS
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Seed yield components and yield per
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International Herbage Seed Conferen
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16:15 - 16:30 Reliability of salini
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Hotel expense is covered for night
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40,000 were slaves (McDonald, 2007)
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Fig. 1. Texas AgriLife Research and
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$7 billion for cattle, $3 billion f
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principle and encourages both AgriL
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eceived by growers, the above perce
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seed conditioning plants are locate
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Table 4.Hectares of open-field burn
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system, a seed crop is produced fro
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Fig. 1. Land resource areas of Texa
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y land owners. Seed yields are low
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The influence of planting density o
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Simple correlation and regression a
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Variation in seed shattering in a g
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Seed retention (SR) was calculated
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mm160120Precipitation8040020Km h -1
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Young, B. A. (1986). A Source of Re
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Several methods are commonly used f
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Table 3. Effect of the length of ha
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Alfalfa seed production in semi-hum
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Rather near the meteorological stat
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ReferencesBolaños-Aguilar E.D., Hu
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ased bioenergy conversion plants wa
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Table 1. Average distances required
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Figure 1. Optimized locations for 1
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Perennial ryegrass (Lolium perenne
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Relative Seed Yieldsingle composite
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Flowers, M.D.; Hart, J.M.; Young II
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Thus, similar to tissue tests, remo
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Conclusion:Perhaps our most importa
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Modelling critical NDVI curves in p
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The five spectral reflectance measu
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Harvest loss in ryegrass seed crops
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Larger than expected harvest losses
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Rolston, P.; Trethewey, J.; McCloy,
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Optical sensors have the potential
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Figure 2. Seed yield response to ap
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Flowers, M. D., Hart, J.M., Young I
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In 2010, France has launched the fo
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Yield (% maximum)ConclusionThe resu
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Plant N uptakeN unavailableSoil nit
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Stresses associated with germinatio
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correspond to electrical conductivi
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applied later in the fall was more
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Figure 2. Establishment of five ove
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The seed vigour testing was perform
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Table 1. Germination index (GI) for
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Reliability of salinity screening L
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AcknowledgmentThis research was sup
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Table 2. Greenhouse salinity screen
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The seeds were collected from the A
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increases germination to its potent
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Light, lodging and flag leaves-what
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Relative seed yieldSeed yield (kg/h
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Hampton, J.G.; Clemence, T.G.A.; He
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The seed set is of major importance
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In grass species with poor seed ret
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support system to optimize fungicid
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weather stations in grass seed fiel
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ust resistance loci in Lolium peren
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Seed yield variation in a red clove
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100Seed yield plant -1 (g)806040200
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Marden, J. H. 1984. Remote percepti
Page 137 and 138: Crimson clover seed production in t
Page 139 and 140: Piper, C.V. 1935. Forage plants and
Page 141 and 142: deal of investigation into the caus
Page 143 and 144: genes and subsequent ability to pro
Page 145 and 146: Gatenby, W.A., S.C. Munday-Finch, A
Page 147 and 148: Control of Vulpia myuros in red fes
Page 149 and 150: The strip design provides an opport
Page 151 and 152: The pot experiments did not reveale
Page 153 and 154: CharacterWeed abundance1 A few plan
Page 155 and 156: Jensen, P. K. (2010) Longevity of s
Page 157 and 158: Effects of intraspecific competitio
Page 159 and 160: flowering, Gangi accumulated a high
Page 161 and 162: The seed yield of Gangi was, on ave
Page 163 and 164: Seed yield components and yield per
Page 165 and 166: ResultsVariation among populations
Page 167 and 168: Table 2. Means of total seeds per p
Page 169 and 170: Ryle, G. J. (1970). Partition of As
Page 171 and 172: Control of Apion trifolii in red cl
Page 173 and 174: Number of seeds /inflorescencesimil
Page 175 and 176: population. However, in spite of th
Page 177 and 178: Corvallis where they were debearded
Page 179 and 180: Table 1. Effect of Palisade growth
Page 181 and 182: Variations on potential and harvest
Page 183 and 184: Determination of optimum desiccatio
Page 185 and 186: Relative seed yield (%)Flowers/m225
Page 187: Harvesting too soon after peak flow
Page 191 and 192: seed yield, kg/haExtractable Al, mg
Page 193 and 194: ReferencesHaby, V.A. (1995). Soil m
Page 195 and 196: Kentucky bluegrass (Poa pratensis L
Page 197 and 198: urn residue management (Fig. 1 and
Page 199 and 200: Comparing herbicide selectivity in
Page 201 and 202: Development of new tetraploid Chlor
Page 203 and 204: Following 4 (or 5) cycles of select
Page 205 and 206: Loch, D.S., Rethman, N.F.G. & van N
Page 207 and 208: KBGcocksfootHykorLofatimothymeadowf
Page 209 and 210: Figure 2 Relative seed yield (%) se
Page 211 and 212: and GA 4 . In consequence this inac
Page 213 and 214: Table 1 The effect of trinexapac-et
Page 215 and 216: Silberstein, T.B., Young, W.C. III,
Page 217 and 218: inflorescece number and seed yield
Page 219 and 220: Germination of Lolium multiflorum g
Page 221 and 222: Effect of sowing density on seed yi
Page 223 and 224: y-products of this grass seed crop
Page 225 and 226: Table 2. Effect of PGR on seed yiel
Page 227 and 228: Further culm length measurements ga
Page 229 and 230: chlorophyllometer. Measurements wer
Page 231 and 232: Table 2. Photosynthesis rate of fla
Page 233 and 234: Organization of grass seed research
Page 235 and 236: Path Coefficient and Ridge Regressi
Page 237 and 238: through y4 (0.133). Increasing y 1
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Newell G.J., Lee B. (1981)Ridge reg
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Relative humidity, seed moisture co
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Ergovaline contents in grasses from
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11.8 % (Central East) to 40.0% (Nor
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ReferencesBony, S. & Delatour, P. (
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Long-term Evaluation of Annual Ryeg
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seed yield. All systems of establis
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Preliminary results after four year
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Casals, Marie-LaureFNAMSImpasse du
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Mao, PeishengForage Seed LabChina A
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Vanasche, DavidVanasche Farm36130 N
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