The effect of repeated defoliation to three different levels on root growth of five pasture species

Evans, Paul N.

doi:10.1080/00288233.1973.10421155

Cited by 51 publications

(34 citation statements)

References 6 publications

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“…The difficulty in developing suitable measurement techniques is one factor in this situation. Window methods [43,44] can give information about rates of root tip arrival and some information about proliferation at the two-dimensional surface of the window. This can be regarded as a random sample of undisturbed soil and can provide data on traits like root tip elongation rate or interactions with soil fauna, but it is difficult to build up a complete three-dimensional picture of the whole root or quantify mass flow Agriculture 2016, 6, 28 9 of 15 using this technique alone.…”

Section: Ingrowth Core Data Provides Insight Complementary To That Frmentioning

confidence: 99%

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Do Phytomer Turnover Models of Plant Morphology Describe Perennial Ryegrass Root Data from Field Swards?

2016

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Abstract:This study aimed to elucidate seasonal dynamics of ryegrass root systems in field swards. Established field swards of perennial ryegrass with white clover removed by herbicide and fertilised with nitrogen (N) to replace clover N fixation were subjected to lax and hard grazing management and root biomass deposition monitored using a root ingrowth core technique over a 13 month period. A previously published phytomer-based model of plant morphology that assumes continuous turnover of the root system was used to estimate mean individual root weight (mg) not previously available for field swards. The predicted root weights compared credibly with root data from hydroponic culture and the model output explained much of the seasonal variation in the field data. In particular, root deposition showed a seasonality consistent with influence of an architectural signal (AS) determined by plant morphology. This AS arises because it is theoretically expected that with rising temperatures and decreasing phyllochron in early summer, more than one leaf on average would feed each root bearing node. Conversely, in autumn the reverse would apply and root deposition is expected to be suppressed. The phytomer-based model was also able to explain deeper root penetration in summer dry conditions, as seen in the field data. A prediction of the model is that even though total root deposition is reduced by less than 10% under hard grazing, individual root weight is reduced proportionately more because the available substrate is being shared between a higher population of tillers. Two features of the field data not explained by the phytomer based model, and therefore suggestive of hormonal signaling, were peaks of root production after summer drought and in late winter that preceded associated herbage mass rises by about one month. In summary, this research supports a view that the root system of ryegrass is turning over on a continuous basis, like the leaves above ground. The phytomer based model was able to explain much of the seasonal variation in root deposition in field swards, and also predicts a shift of root deposition activity, deeper in summer and shallower in winter.

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Section: Ingrowth Core Data Provides Insight Complementary To That Frmentioning

confidence: 99%

Section: Ingrowth Core Data Provides Insight Complementary To That Frmentioning

confidence: 99%

Do Phytomer Turnover Models of Plant Morphology Describe Perennial Ryegrass Root Data from Field Swards?

2016

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“…Raper & Barber (1970Chu & Robertson 1974). Evans (1973) reduced root growth by 50% over a 22 day period by defoliating white clover to 10 ern every second day. Harvesting shoots of white clover after 3 months of uninterrupted growth stopped root growth until the original shoot to root ratio had been attained (Ennik 1966).…”

Section: ·mentioning

confidence: 99%

Root growth of white clover (Trifolium repensl.) lines in glass–fronted containers

Caradus¹

1981

New Zealand Journal of Agricultural Research

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“…Apenas para os meses de verão, menor diferenciação numérica foi encontrada, provavelmente devido às características climáticas nesta época (Sentelhas, 2000), principalmente temperatura e luminosidade, além da água, gerando à planta melhores condições de se adaptar a condições de estresse através de maiores taxas fotossintéticas. Trabalho realizado por Mello et al (2001) A ausência no desenvolvimento radicular foi observada em todos os tratamentos para os primeiros 12 dias após o pastejo, semelhantemente ao que ocorre com forrageiras de clima temperado (Evans, 1976;Mathew, 1992;Donaghy & Fulkerson, 1998). Isto aconteceu, provavelmente, devido à alteração no fluxo de reservas, de maneira a suprir o dreno metabólico proveniente do desenvolvimento de folhas jovens e, consequentemente, recuperação de área fotossintética.…”

Section: Efeito De Tratamentosunclassified

Comportamento do sistema radicular do capim Tanzânia (Panicum maximum, Jacq.) sob irrigação e submetido a diferentes intensidades de pastejo.

Pagotto¹

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The effect of repeated defoliation to three different levels on root growth of five pasture species

Cited by 51 publications

References 6 publications

Do Phytomer Turnover Models of Plant Morphology Describe Perennial Ryegrass Root Data from Field Swards?

Do Phytomer Turnover Models of Plant Morphology Describe Perennial Ryegrass Root Data from Field Swards?

Root growth of white clover (Trifolium repensl.) lines in glass–fronted containers

Comportamento do sistema radicular do capim Tanzânia (Panicum maximum, Jacq.) sob irrigação e submetido a diferentes intensidades de pastejo.

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