Grass Growth in Midsummer and Light Interception and Growth Rate of a Perennial Ryegrass Sward

Anslow, R. C.; Back, H. L.

doi:10.1111/j.1365-2494.1967.tb00511.x

Cited by 10 publications

(7 citation statements)

References 4 publications

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“…Net pasture production was not related to allowance in either year. This supports other New Zealand (Tainton 1974;Marsh 1978) and overseas data (Anslow 1965;Anslow & Back 1967;Jackson 1974) showing that initial yield or leaf area index does not greatly aIter subsequent growth; but contrasts with some other New Zealand workers (Brougham 1956;Brougham & Glenday 1967;Jagusch & Rattray 1977) who found a positive relationship between pasture production and initial yield. Longer term effects…”

Section: Immediate Effectssupporting

confidence: 85%

Effect of herbage DM allowance on the immediate and longer term performance of young Friesian steers at pasture

Marsh

1979

New Zealand Journal of Agricultural Research

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The cumulative effects of different levels of herbage DM allowance on pasture production and quality, and on immediate and longer term animal production by Friesian steers, were investigated in two experiments. In Experiment 1 allowances were 3.0, 4.5, 6.0, and 7.5 kg DM/100 kg live weight (LW) and in Experiment 2 .. Ilowances were 5.0, 7.5, 10.0, and 12.5 kg/lOO kg LW. Pasture production was not significantly affected by allowance in either experiment but utilisation, both per grazing and over the whole season (December to May) , declined significantly as allowance was increased. In vitro digestibility of pasture also declined as allowance increased; this was associated with a build-up of dead matter in the swards.Live-weight gain per animal was linearly related to allowance in Experiment 1 and curvilinearly related to allowance in Experiment 2 with little response above an allowance of 10.0 kg DM/100 kg LW. In both experiments carry-over effects were measured over 7-week periods during which cattle received a restricted pasture allowance together with wilted pasture silage ad libitum. Liveweight and carcass gains were high during these periods but no compensatory growth occurred.

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Section: Immediate Effectssupporting

confidence: 85%

Effect of herbage DM allowance on the immediate and longer term performance of young Friesian steers at pasture

Marsh

1979

New Zealand Journal of Agricultural Research

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“…When the increase in cut herbage in fertilized swards is plotted against interception, initial rates of increase are seen to be considerable at a time when overall top growth is negative. This exaggerated growth in the early stages is the result of a physical transfer of material from below to above the cutting horizon, a situation also noted by Anslow & Back (1967). Consideration of cut herbage only thus tends to produce a degree of flattening in the curve of production against time, and could lead in some circumstances to the impression that growth was linear in character.…”

Section: Crop Growth Rate and Light Interceptionmentioning

confidence: 94%

Changes in growth rate and morphology of perennial ryegrass swards at high and low nitrogen levels

Davies

1971

J. Agric. Sci.

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The nitrogen requirements for maximum production of perennial ryegrass swards in August/September were shown to be of the order of 4 kg N/ha/day. Further increases above this level had no appreciable effect on dry-matter production, leaf area or light intercepted, but maximum tiller numbers were considerably enhanced. Shortage of nitrogenous fertilizer had comparatively little effect on crop growth rate in the early stages of regrowth, but thereafter caused the rate to fall increasingly short of potential. At high fertilizer levels crop growth rate based on total above-ground parts was linearly related to percentage light intercepted in the first month after defoliation, but values subsequently became erratic and at times negative. This change in crop growth rate and the resulting halt in effective net dry-matter production could be associated with the overall pattern of leaf and tiller formation and death, maximum net yield being achieved at the point in time when three new leaves had been produced on each tiller since cutting. It is concluded that in August and September worth-while increases in harvestable net dry matter are unlikely to occur after this stage has been reached, and that managements based on the maintenance of a complete crop cover are not likely to be successful at this time of year.

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“…To get an accurate estimate of dwjdt one must either fit a cosmetic smoothing curve (Putter, Yaron & Bielorai, 1966) to the raw data or use massive samples. The controversy between Anslow and Back (1967) and Brougham & Glenday (1967), shows that the estimates of growth analysis parameters which are drawn from the use of a smoothing equation depend as much on the initial choice and testing of the equation as on the actual growth of the crop. Estimates from our data have shown that with peas, to have a 95 % chance of estimating NAR with an accuracy of 1 g/m a /day would, with a sample of twenty plants from hand-planted plots, require at least thirty replicates.…”

Section: Lw = Asvfi (Equationmentioning

confidence: 99%

The growth of vining peas: I. The effect of time of sowing

Milbourn

Hardwick

1968

J. Agric. Sci.

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Yield and growth analysis have been applied to the results of an experiment comparing early and late sown peas. Yield analysis showed that in this experiment late sown peas had:(i) fewer podding nodes per main stem, (ii) fewer pods per podding node, and (iii) a slower rate of increase in pod weight. The physiological origins of these differences are discussed.The first component is determined by the stage at which node production is terminated by the death of the apical bud.The second is determined by morphogenetic factors at the apical meristem early in in the life of the plant, when (in the variety DSP) either a single or a double flowered raceme is initiated, and also during the harvesting period when some pods are lost from the lower-most flowering nodes.The differences in the third component, the rate of increase in pod weight, could not be explained by conventional growth analysis. Pod growth rate was not a simple function of leaf area index.It is suggested that the relationship between leaf area and pod growth rate is complicated by the existence of other sources of materials for pod growth such as stored products in the roots and stems, and photosynthesis by the fruit itself.

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Grass Growth in Midsummer and Light Interception and Growth Rate of a Perennial Ryegrass Sward

Cited by 10 publications

References 4 publications

Effect of herbage DM allowance on the immediate and longer term performance of young Friesian steers at pasture

Effect of herbage DM allowance on the immediate and longer term performance of young Friesian steers at pasture

Changes in growth rate and morphology of perennial ryegrass swards at high and low nitrogen levels

The growth of vining peas: I. The effect of time of sowing

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