The influence of nitrogen fertilization, spring burning and height of stubble on hay and seed production of<i>eragrostis curvula</i><sup>1</sup>

Rethman, N.F.G.; Beukes, B.H.

doi:10.1080/02566702.1988.9648143

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…Eragrostis curvula is a less palatable but equally important grazing species that becomes abundant under lower frequency defoliation regimes than those suited to T. triandra (Fynn et al 2004, Uys et al 2004. Eragrostis curvula is known to flower from August to June (Gibbs-Russell et al 1990), but most flowers are produced during early summer (Field-Dodgson 1976, Rethman andBeukes 1988). At Ukulinga, the two species reach reproductive maturity within a month of one another during early summer, which made them suitable for comparison.…”

Section: Introductionmentioning

confidence: 98%

The effect of defoliation environment on primary growth allocation and secondary tiller recruitment of two bunchgrasses

Tomlinson

O’Connor

2005

African Journal of Range & Forage Science

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Compositional shifts of bunchgrass species in the Southern Tall Grassveld in response to different combinations of non-selective mowing and burning appear to reflect differences in growth strategy among species, but there are few studies of South African grasses designed to test this. A descriptive study was undertaken both to observe how different species allocated resources in response to different defoliation treatments imposed at the start of spring, as it was thought that these responses might be critical for an understanding of tiller dynamics and compositional change in bunch grasslands. The study recorded the reproductive growth response of two spring-flowering species, Themeda triandra and Eragrostis curvula, subjected to three defoliation treatments: no defoliation (No Mow), defoliation during the previous summer (Summer Mow), and defoliation in early spring (Early Spring Mow). Plant growth response was separated into primary growth, measured as individual organ extension on individual phytomers, and secondary growth, measured as the number of secondary tillers recruited per live primary tiller. Phytomer growth depended on treatment and species. For either species, organ extension was greater for the No Mow treatment than for either of the two defoliated treatments. Tillers of E. curvula were substantially larger and grew faster than T. triandra tillers. In addition, apical meristems of E. curvula remained close to the ground until flowering. These combined differences are consistent with E. curvula being able to outcompete T. triandra in less-frequently defoliated swards. Secondary tiller recruitment was significantly related to defoliation treatment and species. Tiller recruitment was substantially lower on the No Mow treatment than for the two defoliation treatments, and tiller recruitment was greater for T. triandra plants than for E. curvula plants. Accumulated blade length was negatively related to tiller recruitment. Results suggest that tiller recruitment was limited by nutrient demand of primary structures, a consequence of which is that T. triandra will recruit more tillers than E. curvula when defoliation opens up space, accounting for T. triandra's dominance on more regularly-defoliated treatments.

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Section: Introductionmentioning

confidence: 98%

The effect of defoliation environment on primary growth allocation and secondary tiller recruitment of two bunchgrasses

Tomlinson

O’Connor

2005

African Journal of Range & Forage Science

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Autecological studies on grass species in southern Africa — A literature survey

Shackleton

1991

Journal of the Grassland Society of Southern Africa

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Manejo de campos de produção de sementes de Urochloa humidicola €˜comum€™: II - Efeito de práticas culturais

Souza¹,

Peres²,

Filho³

et al. 2015

Bol. Ind. Anim.

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Desde a década de 1970, sementes de Urochloa (syn. Brachiaria) humidicola €˜comum€™ têm constituído fração importante do mercado brasileiro de sementes de pastagens tropicais cultivadas. Maior parte dessas sementes provém de áreas de pastagens nas quais os animais são excluídos desde a primavera até a colheita, no verão. As produtividades comerciais são baixas e variáveis, principalmente em consequência de falta de manejo apropriado à produção de sementes. A produção é prejudicada em relvados heterogêneos quanto à cobertura do solo, altura e constituição. O método de colheita mais utilizado é o da colhedeira automotriz, de reconhecida ineficiência quanto à recuperação das sementes produzidas. O uso desse equipamento é também limitado nesta espécie pela marcante associação entre o sincronismo floral e a degrana (queda) natural das sementes que resulta em curto período de conexão das sementes às inflorescências, fazendo com que permaneçam disponíveis a esse método de colheita por apenas 5 - 7 dias em cada safra. Antecipações ou atrasos da fase reprodutiva das plantas, obtidas por meio de manejo agronômico diferenciado, talvez possam proporcionar a distribuição temporal da produção na mesma safra. Este trabalho foi conduzido com o objetivo de avaliar efeitos de práticas culturais sobre a produtividade, a qualidade e o período de disponibilidade à colheita de sementes de U. humidicola €˜comum€™. Em área anteriormente utilizada como pastagem nos anos de 1999/2000 e 2001/2002, foram avaliados os efeitos de alturas de corte (5 cm e 15 cm acima do solo, respectivamente, e testemunha [plantas não cortadas] associados ou não à remoção ou queima dos resíduos vegetais deles resultantes. Comparativamente à testemunha, os tratamentos resultaram em atrasos na época de maior disponibilidade de sementes puras germináveis à colheita. O acúmulo de biomassa, constituída por remanescentes de folhas e perfilhos mortos ou estéreis e seus segmentos, reduz a produtividade de sementes puras germináveis em U. humidicola €˜comum€™. Os efeitos de formas de eliminação desse acúmulo dependem da quantidade acumulada. Entretanto, nos dois anos de experimento, corte das plantas a 5 cm do solo no início do período chuvoso, seguido de remoção dos resíduos desse corte possibilitou maiores produtividades de sementes puras germináveis.

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The influence of nitrogen fertilization, spring burning and height of stubble on hay and seed production oferagrostis curvula¹

Cited by 4 publications

References 3 publications

The effect of defoliation environment on primary growth allocation and secondary tiller recruitment of two bunchgrasses

The effect of defoliation environment on primary growth allocation and secondary tiller recruitment of two bunchgrasses

Autecological studies on grass species in southern Africa — A literature survey

Manejo de campos de produção de sementes de Urochloa humidicola €˜comum€™: II - Efeito de práticas culturais

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The influence of nitrogen fertilization, spring burning and height of stubble on hay and seed production oferagrostis curvula1

Cited by 4 publications

References 3 publications

The effect of defoliation environment on primary growth allocation and secondary tiller recruitment of two bunchgrasses

The effect of defoliation environment on primary growth allocation and secondary tiller recruitment of two bunchgrasses

Autecological studies on grass species in southern Africa — A literature survey

Manejo de campos de produção de sementes de Urochloa humidicola €˜comum€™: II - Efeito de práticas culturais

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The influence of nitrogen fertilization, spring burning and height of stubble on hay and seed production oferagrostis curvula¹