Seeding rate effects in oat-berseem clover intercrops

Ross, Shirley M.; King, John L.; O’Donovan, John T.; Izaurralde, R. C.

doi:10.4141/p02-130

Cited by 15 publications

(23 citation statements)

References 35 publications

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“…The effects of the density of oats on yields of berseem clover were not significant until the second or third sampling date, and then yields of berseem clover exhibited quadratic decreases with increasing density of oats. There was a non‐linear response of yields of berseem clover to density of oats at later sampling dates that was consistent with a rectangular hyperbolic relationship identified in previous experiments (Ross et al. , 2003).…”

Section: Suppression Of Berseem Cloversupporting

confidence: 87%

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The productivity of oats and berseem clover intercrops. I. Primary growth characteristics and forage quality at four densities of oats

Ross

King

O’Donovan

et al. 2005

Grass and Forage Science

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Berseem clover (Trifolium alexandrinum L.) was sown as an intercrop with oats (Avena sativa L.) at 0, 30, 60, 90 and 240 oats plants m )2 in May in 1999 and 2000 in Alberta, Canada. Forage yield and quality were measured at 10-d intervals between 35 and 88 d after planting (DAP). Yield is defined as the biomass above 6 cm of the soil surface. The dry-matter (DM) yield of berseem clover in sole crops increased by 5-10 g m )2 d )1 between 35 and 55 DAP and then increased by 21-28 g m )2 d )1 between 55 and 75 DAP. The DM yields of oats sown at 240 plants m )2 increased by 26-28 g m )2 d )1 over the whole period from 35 to 75 DAP. Oats were the dominant component in the intercrops, even at low densities of oats. Berseem clover grown with 60 oats plants m )2 received only 0AE24 of the incident light when shading by oats peaked at 65 DAP. DM yields of berseem clover in intercrops with 60 oats plants m )2 averaged 0AE14-0AE32 of the yields of berseem clover sole crops. Between 35 and 88 DAP in 2000, the crude protein (CP) concentration of berseem clover sole crops declined linearly from 310 to 180 g kg )1 DM, and the CP concentration of oats exhibited a quadratic response, declining from 350 g kg )1 DM at tillering to 110 g kg )1 DM at the soft dough stage. The mean CP concentration of berseem clover in intercrops with 60 oats plants m )2 was 25 g kg )1 less than in berseem clover sole crops, indicating that competition by oats reduced the CP concentration of berseem clover. At later sampling dates, CP and DM yields of intercrops with oats at 60 plants m )2 equalled those with oats at 240 plants m )2 . The addition of berseem clover to oats in intercrops at 60 oats plants m )2 reduced the neutraldetergent fibre concentration by 30 g kg )1 DM compared with oats alone. Oats were very competitive as a companion crop for berseem clover. Adding berseem clover to oats increased forage quality and may provide for increased intake and digestibility of forage to support higher livestock productivity.

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Section: Suppression Of Berseem Cloversupporting

confidence: 87%

“…Growing oats with berseem clover can decrease weed growth but oats also compete with berseem clover (Welty et al. , 1991; Holland and Brummer, 1999; Ross et al. , 2003).…”

Section: Introductionmentioning

confidence: 99%

The productivity of oats and berseem clover intercrops. I. Primary growth characteristics and forage quality at four densities of oats

Ross

King

O’Donovan

et al. 2005

Grass and Forage Science

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“…Total DM yields of berseem clover as a sole crop were less than those of intercrops in both years, with significance at P < 0·06 in 1999. In related experiments, total annual DM yields of berseem clover as a sole crop were less than those of cereal‐berseem clover intercrops in three out of five cases (Ross et al. , 2003; 2004a,b).…”

Section: Berseem Clover Sole Crops Vs Berseem Clover–oats Intercropsmentioning

confidence: 91%

“…Other factors affecting the intercrop system illustrated in Figure 2 have been explored in previous studies. Increasing the sowing rate of berseem clover has some effect on the initial DM yield of berseem clover but changes in the sowing rate of the dominant species (cereal) had a much greater effect on species composition (Ross et al. , 2003).…”

Section: Model Of a Forage Intercrop Systemmentioning

confidence: 99%

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The productivity of oats and berseem clover intercrops. II. Effects of cutting date and density of oats on annual forage yield

Ross

King

O’Donovan

et al. 2005

Grass and Forage Science

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Annual forage yields of intercrops of berseem clover (Trifolium alexandrinum L.) and oats (Avena sativa L.), as affected by timing of initial harvest and sowing rate of oats, were investigated. Berseem clover was intercropped with oats at 0, 30, 60, 90 and 240 plants m )2 of oats in 1999 and 2000 in Alberta, Canada. Cutting date treatments involved initial harvest at 10-d intervals between 35 and 88 d after planting (DAP), and one or two subsequent harvests of regrowth. Total intercrop dry-matter (DM) yield averaged 12AE9-13AE3 t ha )1 with proportions of 0AE21-0AE43 of berseem clover in the forage. Treatments with an initial cut at the silage stage of oats (76 DAP in 1999, 88 DAP in 2000, at about soft-dough stage of oats) had greater yields of oats, lower yields of berseem clover, and lower proportions of berseem clover in total annual yields than treatments with an earlier initial cut. Total crude protein (CP) yield was greater with an initial cut at 65-66 DAP than with a silage-stage initial cut. With an initial cut at 35 DAP (before stem elongation of oats) or after 65 DAP (after heading of oats), yield potential of oats was sometimes reduced compared with silage-stage treatments, but this was balanced by a greater yield of berseem clover. The impact of harvest timing on total yield decreased as the proportion of berseem clover in the intercrops increased. With decreasing density of oats, DM yield of first-cut intercrops and total DM yield of oats decreased, while regrowth and total DM yields of berseem clover increased. Intercrops with oats at 60 plants m )2 had equal or greater total DM and CP yields than intercrops with 240 plants m )2 of oats. For intercrops with oats at 60 plants m )2 , with initial cuts at 65-66, 75-76, or 88 DAP, yields of regrowths were 0AE30-0AE35, 0AE16-0AE26 and 0AE09 of the total yield respectively. Oats-berseem clover intercrops showed potential to manipulate the pattern of annual forage yield and to provide flexibility of harvest without reducing annual yields.

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Width of clover strips and wheat rows influence grain yield in winter wheat/white clover intercropping

Thorsted

Olesen²,

Weiner

2006

Field Crops Research

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Seeding rate effects in oat-berseem clover intercrops

Cited by 15 publications

References 35 publications

The productivity of oats and berseem clover intercrops. I. Primary growth characteristics and forage quality at four densities of oats

The productivity of oats and berseem clover intercrops. I. Primary growth characteristics and forage quality at four densities of oats

The productivity of oats and berseem clover intercrops. II. Effects of cutting date and density of oats on annual forage yield

Width of clover strips and wheat rows influence grain yield in winter wheat/white clover intercropping

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