Texas, USA 2010 - International Herbage Seed Group

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Table 2. Effect of Palisade growth regulator on seed yield, lodging, and plant height on a second year field of 15 Kentucky bluegrassvarieties planted August, 2007 at COARC, Madras, Oregon.Evaluation Dates7/1/09 5/27/09 6/3/09Clean seed yield (lb/acre) Lodging (%) Plant ht (in) Plant ht (in)Variety Check Palisade % Check Signif. Check Palisade Check Palisade Check PalisadeAtlantis 1002 1049 105 ns 23 3 17.0 14.0 25.8 20.5Merit 860 884 103 ns 13 1 13.3 9.8 21.3 15.8Rhapsody 412 661 160 ** 15 0 12.0 10.3 18.8 14.8Valor 487 584 120 ns 31 0 11.3 7.5 17.0 11.3Bariris 203 344 169 ns 85 60 20.0 14.3 27.0 24.5Crest 838 708 84 ns 25 0 13.8 10.0 20.8 15.3Monte Carlo 561 636 113 ns 71 6 11.3 9.5 17.0 13.0Shamrock 818 928 113 ns 69 14 19.0 14.0 27.0 22.3A00-891 951 1187 125 * 30 3 12.5 9.8 21.0 17.3A00-1400 480 657 137 ns 56 10 12.3 11.3 17.8 15.5Bandera 655 748 114 ns 24 5 13.8 10.3 20.3 15.8Bordeaux 751 757 101 ns 53 10 15.0 10.0 24.5 16.5Volt 950 1133 119 ns 81 10 20.3 16.0 28.0 23.8Zinfandel 732 980 134 ** 41 16 12.0 9.3 16.8 12.0A01-299 825 1070 130 ** 33 1 15.0 11.5 19.3 17.31 Comparison with paired t-test: ns=non-significant, * for P=0.10, ** for P=0.05, *** for P= 0.01169
Variations on potential and harvested seed yield of Lotus tenuis sown atdifferent densities during spring and fall.G. Cambareri 1 , J. Castaño 1 , N. Maceira 1 ; O. Vignolio 1 , O. Fernández 1 , & J. Cerono 21 Unidad Integrada Balcarce (UIB: INTA EEA Balcarce – Facultad de Ciencias Agrarias, UNMDP)RN 226, Km 73.5 (7620) Balcarce, Buenos Aires, Argentina2 KWS Argentina, Av. San Martín 4075 (7620)Balcarce, Buenos Aires, Argentina.E-mail: gscambareri@balcarce.inta.gov.arLotus tenuis is a forage legume broadly adopted by beef cattle breeders in the Flooding Pampasof Argentina, because of its positive attributes like high nutritive value, non bloating effect,natural re-seeding, and tolerance to grazing, flooding and alkalinity conditions. In Argentina,national production of certified seed of L. tenuis evolved from 10 t in 1999 to 84 t in 2007.Although seed yields under commercial production are low (< 200 kg ha -1 ), but yields of 1200Kg seed/ha are possible when grown under non stress conditions. Forage seed crops are currentlyplanted in the fall at ca. 6 Kg Ha -1 in this region, and there is no information on how plantingdate and plant density affect seed yield for this species. The main goal of this work was toanalyze the influence of plant density on potential and harvested seed yield of Lotus tenuis, inspring and fall crops. A field experiment was carried out in the Estación ExperimentalAgropecuaria Balcarce (INTA, 37º 45‟ S, 58º 18‟ W; 130 m.s.n.m ). Nine 2.1 m x 6 m plots(17.5 cm wide rows) were planted in the spring of 2006 (September 21 th ) and the autumn of 2007(April 12 th ) in a Typic Argiudoll Soil. The plots were maintained free of weeds, harmful insectsand irrigated to keep soil moisture. After emergence, the seedling stands were hand-thinnedattaining three plant densities: 26, 43 and 87 pl m-2 (low, medium and high, respectively). Thus,a 3 densities x 3 blocks (related to topography) design was established and analyzed withstatistical software R at each planting date. A 56 cm diameter wired circle was used to delimit a0.25 m 2 harvest area. Two sub samples per plot were harvested at maturity (>50 % of maturebrownish pods in a 0.33 m 2 area), clipping with hand-scissors and leaving a ca. 3 cm highremanent herbage. The effect of three plant densities on potential and harvested seed yield wasanalyzed at each planting date. Potential seed yield was estimated by means of a linearrelationship between pods weight and seed number. <strong>Seed</strong> yields increased with plant density, forboth spring and fall crops (Table 1). The highest potential seed yield was recorded in springcrops which almost doubled fall crops yields for all the densities. This finding also suggests thepresence of a wider gap between harvested and potential seed yield when Lotus is sown in thespring. According to these results the gap between harvested and potential seed yield is smallerin fall crops of Lotus tenuis sown at high densities. Spring crops with low percentage of poddehiscence and timely harvest are needed to reduce this gap.170
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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
Page 129 and 130: ust resistance loci in Lolium peren
Page 131 and 132: Seed yield variation in a red clove
Page 133 and 134: 100Seed yield plant -1 (g)806040200
Page 135 and 136: 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: Table 1. Effect of Palisade growth
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 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
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Table 2. Photosynthesis rate of fla
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Organization of grass seed research
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Path Coefficient and Ridge Regressi
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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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Texas, USA 2010 - International Herbage Seed Group

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