The effect of cutting for conservation on a grazed perennial ryegrass‐white clover pasture

Curll, M. L.; Wilkins, R. J.

doi:10.1111/j.1365-2494.1985.tb01716.x

Cited by 33 publications

(21 citation statements)

References 23 publications

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“…Reduced animal performance in swards which had previously received N fertilizer are in accord with results in the previous year in which liveweight gain and wool production was closely related to the quantity of herbage on offer and to the proportion of clover present (Curll et al, 1985). In 1979 these swards had markedly less herbage on offer and lower clover proportions than in swards that had not received N in 1978.…”

Section: Discussionsupporting

confidence: 85%

“…The tiller density of ryegrass and of unsown species, the density of clover seedlings and the total density of clover stolons were estimated using cores collected at 6-week intervals, using the methods already described (Curll et al, 1985).…”

Section: Measurementsmentioning

confidence: 99%

“…A previous study (Curll et al,, 1985) has shown that the clover content of perennial ryegrass {Lolium perenne)~wh\le clover {Trifotium repens) swards can be seriously reduced both by continuously stocking sheep at high rates and by the use of N fertilizer. Since clover can provide substantial quantities of N for its companion grass sjjecies and is superior to grass in feeding value (e.g.…”

Section: Introductionmentioning

confidence: 99%

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The effects of stocking rate and nitrogen fertilizer on a perennial ryegrass‐white clover sward

Curll

Wilkins

Snaydon

et al. 1985

Grass and Forage Science

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Four stocking rates (25-55 sheep ha~') antl two N fertilizer treatments (nil or 200 kg N ha"') were imposed on swards containing perennial ryegrass (Lolium perenne) and white clover {Trifolium repens) which were continuously stocked throughout one grazing season. These treatments gave swards that varied greatly in their content of white clover. The effects of these treatments on pasture and animal performance in the following season were examined when all plots were continuously-stocked with 25 yearling sheep ha"' and received no N fertilizer. There was slight regeneration of clover in the second year. Herbage growth ranged from 5-4 to i lOt dry matter (DM) ha"', was closely correlated with the clover content of the swards and was higher on swards that had previously received 0 rather than 200 kg Nha"'.The liveweight gain and wool production of sheep in the second grazing season closely reflected the herbage growth and clover content of the swards. As a result, animal production was greatest from swards which had previously been stocked at the lowest rate and had received no N fertilizer and ieast from swards which had been stocked at the lowest rate but had received N fertilizer.The results show that the adverse effects of over-grazing and N fertilizer application in one season may be partially rectified by lower stoc-

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Section: Discussionsupporting

confidence: 85%

Section: Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effects of stocking rate and nitrogen fertilizer on a perennial ryegrass‐white clover sward

Curll

Wilkins

Snaydon

et al. 1985

Grass and Forage Science

Self Cite

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“…Stolon lengths, as estimated by both observers, were essentially the same as the measured lengths and gave much more information on seasonal population changes than percent frequency. The stolon lengths measured in these studies in the subtropics spanned the ranges measured in grazed swards in temperate areas (e.g., Curll & Wilkins 1985;Hay et al 1987 As calibrated visual estimation procedures, such as BOTANAL, are routinely used to estimate yield and composition in a large number of quadrats, then the results of this study suggest that it would take less than one minute to estimate an extra variable, e.g., stolon length, on each quadrat. Depending on the density of clover stolons and number of quadrats and area sampled, it could take several hours to measure stolon length in the standard quadrats.…”

Section: Discussionmentioning

confidence: 98%

“…Dissection of turves, used in very detailed studies (e.g., Curll & Wilkins 1985;Hay etal. 1987), was not an option because of the time involved.…”

Section: Introductionmentioning

confidence: 99%

A visual procedure for estimating stolon length of white clover per unit area in grazed pastures

Jones

Bunch

Jones

2000

New Zealand Journal of Agricultural Research

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Stolon length per unit area is a useful measurement to make in studies of white clover, but is time consuming and seldom done in routine sampling of grazing experiments. This study explored the possibility of using a calibrated visual estimation technique to estimate stolon length per unit area in a grazed pasture in south-east Queensland, Australia. Estimates were made of stolon presence in 50 quadrats on a 1-5 scale on 4 different occasions. These were converted to stolon length per unit area using a set of 10 standard quadrats which were estimated and then measured. The estimates on the 50 quadrats were then compared with their true values. Estimates of stolon length were very close to measured values and gave useful insight into seasonal changes in stolon length that were not detected by measurements of stolon presence/absence (% frequency). The procedure outlined could be readily incorporated with routine measurements of presentation yield and botanical composition made with the BOTANAL procedure.A 00006

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Mixed Grazing and Climatic Determinants of White Clover (Trifolium repens L.) Content in a Permanent Pasture

2001

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The effects of grazing regime (cattle, sheep and mixed cattle + sheep) on white clover content (clover dry matter as a percentage of total dry matter) were measured in a permanent pasture over a 7 year period in the west of Ireland (53°17'N 847'E). Rotational grazing was simulated by grazing for short intense periods of 3 4 d at 3 to 5 week intervals. In general, cattle grazing resulted in higher clover content (13-5 %) compared with mixed (9.5 %) or sheep (4-9 %) grazing. The ranking of clover contents (cattle > mixed > sheep) which developed rapidly in 1990 persisted until 1996. Clover contents under mixed grazing tracked those under cattle grazing during the first 4 years, and sheep grazing during the final 3 years. Within-year relativities in clover content among grazing regimes that existed at the start of the grazing season persisted throughout the year. There was an indication that differences in clover content between grazing regimes at the end of grazing persisted until the following spring. A regression analysis of clover content in each grazing period showed strong effects of grazing regime, generally positive relationships with mean air temperature in the period and clover content in the preceding period, and an interaction between air temperature and clover content in the previous period. Implications for pasture management and experimentation are discussed.

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The effect of cutting for conservation on a grazed perennial ryegrass‐white clover pasture

Cited by 33 publications

References 23 publications

The effects of stocking rate and nitrogen fertilizer on a perennial ryegrass‐white clover sward

The effects of stocking rate and nitrogen fertilizer on a perennial ryegrass‐white clover sward

A visual procedure for estimating stolon length of white clover per unit area in grazed pastures

Mixed Grazing and Climatic Determinants of White Clover (Trifolium repens L.) Content in a Permanent Pasture

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