Influence of Planting Rates and Mowing on Yield and Quality of Crimson Clover Seed<sup>1</sup>

Rampton, H. H.

doi:10.2134/agronj1969.00021962006100010031x

Cited by 9 publications

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“…The weight of untreated seeds ranged from 4.89 to 5.67 mg, whereas the weight of TE‐treated seeds ranged from 4.24 to 5.43 mg. Seed weights in crimson clover from other published reports were noted to be in the range of 2.30 to 4.90 mg (Iannucci and Martiniello, 1998; Iannucci et al, 1996; Martiniello, 1999; Rampton, 1969); thus, the seed weight found in this study was high by comparison. Rampton (1969) did not find any differences in seed germination across the range of seed weights similar to those observed for the TE‐treated seed in this study; therefore, it is unlikely that the lower weight seed evident in TE treatments caused reduced seed germination.…”

Section: Discussionsupporting

confidence: 54%

Trinexapac‐ethyl Affects Seed Production in Crimson Clover

2019

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Core Ideas Crimson clover canopy height was reduced with trinexapac‐ethyl applications. Seeds m–2 in crimson clover was increased by trinexapac‐ethyl applications. Seed yield responses to trinexapac‐ethyl were dependent on spring weather conditions. Seed weight reductions were inversely proportional to trinexapac‐ethyl rate. This is the first study to document effects of trinexapac‐ethyl on crimson clover seed crops. ABSTRACT Trinexapac‐ethyl (TE), a plant growth regulator (PGR) and lodging‐control agent, increases seed yield in red clover (Trifolium pratense L.), but the effects of TE are unknown in crimson clover (Trifolium incarnatum L.) seed crops. The objectives of this study were to determine TE application rate and timing effects on crop canopy characteristics, seed yield, and seed yield components of crimson clover. On‐farm trials were conducted at two locations (Banks and St. Paul, OR) in 2012 and 2013 and at the Hyslop Research Farm near Corvallis, OR, in 2015 and 2016. Treatments were TE PGR application rates (0, 105, 140, 210, 280, 420, and 560 g a.i. ha−1) and two application timings (stem elongation, Biologische Bundesanstalt, Bundessortenamt und CHemische Industrie [BBCH] 32; inflorescence emergence, BBCH 51). Application of TE PGR reduced height of the seed crop canopy. Seed yield was increased in 2012 and 2013 with rates ≤280 g TE ha−1 when applied at the BBCH 32 timing. Seed yield increases attributable to TE ranged from 12 to 36%. However, no effects of TE application on seed yield were observed in 2015 and 2016, likely as a result of dry and warm spring weather. Seed yield increases in 2012 and 2013 were a result of TE‐induced increases in seeds m−2. Seed weight was reduced by TE application, and these reductions were inversely proportional to TE rate. Seed yield responses in crimson clover to TE PGR varied across years and locations, with seed yield increases occurring in wet and cool spring weather conditions.

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Section: Discussionsupporting

confidence: 54%

Trinexapac‐ethyl Affects Seed Production in Crimson Clover

2019

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“…Assim, essa característica, dependendo da sua variabilidade em determinada população, pode mostrar-se significativa na determinação do rendimento de sementes. Além disso, essa variável também é importante, por refletir o vigor das sementes e, em trevo vermelho, pode ser influenciada por vários fatores, como: umidade, temperatura, corte das plantas, vigor da haste na qual as sementes são formadas, precocidade etc (Winch & Tossel, 1960;Howkins, 1965;Rampton, 1969;Clifford & Anderson, 1979).…”

Section: Resultsunclassified

Análise de trilha para rendimento de sementes em trevo vermelho (Trifolium pratense L.)

Montardo

Dall'Agnol

Crusius³

et al. 2003

R. Bras. Zootec.

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RESUMO -O trevo vermelho é uma leguminosa forrageira de clima temperado que apresenta bom potencial de produção de matéria seca e qualidade de forragem, sendo indicado para complementar a dieta dos animais durante a estação fria do ano no sul do Brasil. O objetivo do trabalho foi, por meio da realização de uma análise de trilha para rendimento de sementes em trevo vermelho, obter informações básicas para utilização em programas de melhoramento e/ou estratégias de manejo que levem à maior produção de sementes e, conseqüentemente, maior ressemeadura natural, proporcionando condições para maior persistência da espécie na pastagem. Foram analisadas as seguintes características: rendimento de sementes, número de hastes por planta, número de inflorescências por planta, número de inflorescências por haste e peso de mil sementes. A variável que mais se correlacionou com o rendimento de sementes foi o número de inflorescências por planta (r = 0,710), sendo que essa correlação se deu praticamente apenas pelo efeito direto da mesma. As demais variáveis apresentaram menores valores de correlação com o rendimento de sementes (r entre 0,175 e 0,578), com efeitos diretos reduzidos ou negativos sobre essa última característica. Portanto, o número de inflorescências por planta mostrou-se como a principal característica a ser considerada na busca de maior produção de sementes em trevo vermelho.Palavras-chave: forrageiras, melhoramento genético, pastagem, persistência Path Analysis for Seed Production in Red Clover (Trifolium pratense L.)ABSTRACT -Red clover is a temperate legume species that shows good dry matter yield potential and forage quality, being indicated to supplement livestock animals during the cool season in the Southern part of Brazil. The objective of this experiment was to study seed yield in red clover through the use of path analysis, aiming to generate basic information to be used on breeding program or in management strategies, which lead to an increase on seed yield, natural reseeding and thus to a greater pasture persistence. The following variables were analyzed: seed yield, number of stems per plant, number of seed head per plant, number of seed head per stem and weight of one thousand seeds. The number of seed head per plant was the variable with the greatest correlation with seed yield (r = .710), basically through its direct effect on seed yield. The other variables showed smaller correlation coefficients with seed yield (r values from .175 to .578) as well as presented negative or small direct effects on it. Therefore, the number of seed head per plant showed to be the main characteristic to be considered when an increase in the red clover seed yield is required. IntroduçãoA base da pecuária de corte no Rio Grande do Sul é seu campo nativo, o qual é composto, basicamente, por espécies subtropicais de ciclo estival. Por isso, durante a estação fria, o campo nativo cessa seu crescimento, reduz sua qualidade e os animais entram em um período de perda de peso. Uma alternativa para superar essa lacuna deix...

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“…Several authors (Argel and Humphreys, 1983; Archer, 1990) have reported that forage legumes produce more hard seeds in hotter and drier conditions. Also, Rampton (1969) found a higher hard seed content in mowed than in unmowed crimson clover ( T. incarnatum L.); he stated that, after mowing, plants undergo stress and mature later (i.e., when conditions are drier). In mechanically threshed seeds (Exp.…”

Section: Discussionmentioning

confidence: 99%

Cut and Post‐Cut Herbage Management Affects Berseem Clover Seed Yield

2013

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The seed yield of berseem clover (Trifolium alexandrinum L.) is usually obtained from regrowth after forage utilization. In stockless, cereal-growing, or specialized seed farms the forage is not needed and the mowed herbage is seldom marketable. Three different experiments were conducted in a Mediterranean environment to evaluate the effect of returning the cut biomass to the soil/crop on the regrowth, seed yield, and seed quality of berseem clover. Different forms of cut and post-cut management were examined, in which the time of cutting, the amount of biomass returned to the crop/soil, and the size of the returned material (unchopped or chopped) all varied. In addition, the effect of the berseem management on the grain yield and N content of a subsequent durum wheat (Triticum durum Desf.) crop was evaluated. The study showed that when cutting takes place during the early spring, removing and returning the herbage both result in similar seed yields but when cutting takes place later it is necessary to chop the herbage to eliminate or strongly attenuate the negative effects of mulching on seed yield. In farms in which it is not convenient or possible to use the cut herbage, returning the herbage to the crop/soil (without detrimental effects on seed yield) would increase N availability for subsequent non-legume crops. This option appears to be particularly relevant to organic farming.

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Influence of Planting Rates and Mowing on Yield and Quality of Crimson Clover Seed¹

Cited by 9 publications

References 0 publications

Trinexapac‐ethyl Affects Seed Production in Crimson Clover

Trinexapac‐ethyl Affects Seed Production in Crimson Clover

Análise de trilha para rendimento de sementes em trevo vermelho (Trifolium pratense L.)

Cut and Post‐Cut Herbage Management Affects Berseem Clover Seed Yield

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Influence of Planting Rates and Mowing on Yield and Quality of Crimson Clover Seed1

Cited by 9 publications

References 0 publications

Trinexapac‐ethyl Affects Seed Production in Crimson Clover

Trinexapac‐ethyl Affects Seed Production in Crimson Clover

Análise de trilha para rendimento de sementes em trevo vermelho (Trifolium pratense L.)

Cut and Post‐Cut Herbage Management Affects Berseem Clover Seed Yield

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Influence of Planting Rates and Mowing on Yield and Quality of Crimson Clover Seed¹