Texas, USA 2010 - International Herbage Seed Group

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ReferencesCanode, C.L. & Law, A.G. (1979). Thatch and tiller size as influenced by residue managementin Kentucky bluegrass seed production. Agron. J. 71:289-291.Huff, D.R. & Bara J.M. (1993). Determining genetic origins of aberrant progeny from apomicticKentucky bluegrass using a combination of flow cytometry and silver stained RAPD markers.Theoret. Appl. Genetics 87:201-208.Johnson, R.C., Johnston, W.J., Bertoli, F.B. & Golob, C.T. (<strong>2010</strong>). <strong>Seed</strong> yield, development,and variation in diverse Poa pratensis accessions. Crop Sci. 50:337-344.Johnson, R.C., Johnston, W.J. & Golob, C.T. (2003). Residue management, seed production,crop development, and turf quality in diverse Kentucky bluegrass germplasm. Crop Sci.43:1091-1099.Johnston, W.J. & Johnson, R.C. (2000). Washington State and USDA work to preserve andclarify the rich diversity of Kentucky bluegrass. Diversity 16(1&2):30-32.Johnston, W.J., Nelson, M.C., Johnson, R.C. & Golob, C.T. (1997). Phenotypic evaluation ofPoa pratensis L.: USDA/ARS plant introduction germplasm collection. Int. Turf. Soc.Res. J. 8:305-311.Lamb, P.F. & Murray, G.A. (1999). Kentucky bluegrass seed and vegetative responses toresidue management and fall nitrogen. Crop Sci. 39:1416-1423.Nelson, M.C. (1996). Development of a Kentucky bluegrass core collection: Phenotypicevaluation of the USDA/ARS Plant Introduction germplasm collection. M.S. thesis.Washington State Univ., Pullman, WA.SAS Institute Inc. (1990). SAS user‟s guide. Version 6, 4 th ed. Vol. 2 SAS Institute Inc., Cary,NC.187
Comparing herbicide selectivity in field- and pot-grown grass seed cropsP. Kudsk, P.K. Hansen & S.K. MathiassenAarhus University, Department of Integrated Pest ManagementDK-4200 Slagelse, DenmarkE-mail: Per.Kudsk@agrsci.dkEffective chemical weed control measures are a prerequisite for producing high quality grassseeds. Very few herbicides are registered for use in grass seed crops and weed control relies to alarge extend on so-called off-label approvals that are not supported by the pesticidemanufactures, i.e. the use is on the risk of the user. New weed problems are emergingcontinuously and particularly grass weeds are becoming an increasing problem in the grass seedproduction. Selectivity is the main issue when looking for new chemical solutions for weedcontrol in grass seed crops. The documentation required for off-label approvals originates fromfield experiments paid for by the growers. The objective of the present study was to examinewhether regular field experiments where yields are taken could be fully or partly replaced by aless costly and less time-consuming testing procedure based on pot experimentation and fieldexperiments with logarithmic sprayers.Experiments were conducted in the field with a range of broadleaved and grass weed herbicidesusing a logarithmic sprayer delivering an exponential decrease in the dose in response to time orapplying 6 herbicide doses using a plot sprayer. Concurrently with the field trials we conductedpot experiments out-doors and in glasshouses examining the selectivity of the same herbicidesunder contrasting conditions by varying climatic conditions, soil type, growth stage ofapplication etc. The hypothesis we would like to test was the following: by using a test protocoltaking into account the parameters known to affect herbicide selectivity it is possible to predictfield performance based on results from pot experiments or alternatively from field experimentswith logarithmic sprayers. If confirmed this would allow a faster and less costly test procedurebecause non-selective herbicides could be omitted from the tests at an early stage and fieldtesting of potential candidate herbicides could be reduced.Two of the herbicides tested were Atlantis WG (30g/kg mesosulfuron-methyl+6 g/kgiodosulfuron-methyl-Na+90 g/kg mefenpyr-diethyl) and Agil 100 EC (100 g/L propaquizafop).Application of 10 g/ha Atlantis WG resulted in more than 80% crop damage on Lolium perenneL., Festuca arundinacea Shreb. and Poa pratensis L. while Festuca rubra L. and Dactylisglomerata L. were more tolerant (20-40% crop damage. The ranking of the 5 grass seed cropswas similar in the field trials with the logarithmic sprayer but, in general, crop tolerance washigher in the field compared to the pots. In the regular field experiments application of 200 g/haAtlantis WG caused yield reductions of 10 and 22% in D. glomarata and F. rubra whereas yieldlosses in the 3 other grass species ranged from 50 to 100%.188
Page 1 and 2:
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
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Crimson clover seed production in t
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Piper, C.V. 1935. Forage plants and
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deal of investigation into the caus
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genes and subsequent ability to pro
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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 and 188: Harvesting too soon after peak flow
Page 189 and 190: Annual ryegrass seed production in
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: urn residue management (Fig. 1 and
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
Page 239 and 240: Newell G.J., Lee B. (1981)Ridge reg
Page 241 and 242: Relative humidity, seed moisture co
Page 243 and 244: Ergovaline contents in grasses from
Page 245 and 246: 11.8 % (Central East) to 40.0% (Nor
Page 247 and 248: 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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Texas, USA 2010 - International Herbage Seed Group

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