The dynamics of lucerne (Medicago sativa L.) yield components in response to defoliation frequency

Teixeira, Edmar; Moot, Derrick J.; Brown, Hamish E.; Fletcher, Andrew

doi:10.1016/j.eja.2006.12.005

Cited by 50 publications

(52 citation statements)

References 21 publications

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“…Similarly, maximum shoot population was unaffected by treatments and the rates of shoot appearance and mortality were mainly controlled by temperature and canopy light environment, respectively (Teixeira et al, 2007a). This suggests that the extent by which defoliation treatments reduced the level of endogenous reserves was insufficient to limit basal bud initiation or affect axillary leaf appearance.…”

mentioning

confidence: 82%

“…Marked shoots that exhibited an early senescence or death within the regrowth cycle were discarded and replaced with new Dominant-shoots. This bias was intentionally used to ensure that only Dominant-shoots were measured because they contributed to the majority of the above ground yield (Teixeira et al, 2007a).…”

Section: Sampling Of Shoot and Taproot Dry Matter (Dm)mentioning

confidence: 99%

“…In brief, total nitrogen was analysed from 500 mg samples of taproot dry tissue using the Kjeldahl protocol (AOAC, 1995). (Teixeira et al, 2007a), from different plants were marked in each treatment plot. Starting from 7-10 days after grazing, these marked shoots were assessed every 5-7 days for the number of fully expanded primary leaves during both years and, in 2003/04, also for the number of senesced leaves.…”

Section: Sampling Of Shoot and Taproot Dry Matter (Dm)mentioning

confidence: 99%

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How does defoliation management impact on yield, canopy forming processes and light interception of lucerne (Medicago sativa L.) crops?

Teixeira

Moot

Brown

et al. 2007

European Journal of Agronomy

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The frequency of defoliation is the major management tool that modulates shoot yield and the accumulation of C and N root reserves in lucerne crops. A fully irrigated, twoyear old lucerne (Medicago sativa L.) crop was grown at Lincoln University (43°38'S and 172°28'E) and subjected to four defoliation treatments. These involved the combination of two grazing frequencies (28 or 42 days) applied before and/or after midsummer. Annual shoot dry matter (DM) yield ranged from 12 to 23 t/ha. These

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mentioning

confidence: 82%

Section: Sampling Of Shoot and Taproot Dry Matter (Dm)mentioning

confidence: 99%

Section: Sampling Of Shoot and Taproot Dry Matter (Dm)mentioning

confidence: 99%

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How does defoliation management impact on yield, canopy forming processes and light interception of lucerne (Medicago sativa L.) crops?

Teixeira

Moot

Brown

et al. 2007

European Journal of Agronomy

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“…The numbers of primary leaves were counted on each marked main stem at 7-10 day intervals starting from seedling emergence, or the beginning of regrowth, until the onset of flowering. Only 'dominant main stems' were marked, namely the tallest one third of the shoot population, because these account for the majority (>80%) of the shoot yield in lucerne crops (Teixeira et al, 2007a).…”

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confidence: 99%

Growth and phenological development patterns differ between seedling and regrowth lucerne crops (Medicago sativa L.)

Teixeira

Brown

Meenken

et al. 2011

European Journal of Agronomy

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This study compared physiological responses of fully-irrigated seedling and regrowth lucerne crops (Medicago sativa L.) grown under similar environmental field conditions. Measurements occurred for 2-4 years after sowing on 24 Oct, 15 Nov, 05 Dec and 27 Dec 2000 at Lincoln, Canterbury, New Zealand. Irrespective of the date of sowing, on average lucerne accumulated less shoot dry matter (DM) in the seedling year (11±0.44 t.ha -1 ) than during the regrowth year (18±0.76 t.ha -1 ). Slower shoot-growth rates in seedlings were controlled by air temperature and ranged from 161°Cd for seedlings to 274°Cd for regrowth crops. These results can be used as guidelines to develop differential management strategies for seedling and regrowth crops and improve the parameterization of lucerne simulation models.

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“…Seedling crops established 212 ± 32 plants m −2 within one month after sowing and populations of regrowth crops at the start of the measurement period (June 2011) were 198 ± 63, 160 ± 16 and 262 ± 93 plants m −2 at the stone free, stony and very stone site, respectively (Sim 2014). Plant density would not have been expected to impact on productivity among crops, which were above the critical threshold of~50 plants m −2 where yield and water extraction are negatively affected (Dolling et al 2011;Teixeira et al 2007a). …”

Section: Experimental Sites and Designmentioning

confidence: 99%

Soil water extraction patterns of lucerne grown on stony soils

et al. 2016

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Background and aims Lucerne (Medicago sativa L.) is often grown under water-limited production conditions due to its capacity to extract water from deep soil layers through an extensive taproot system. These soils often contain stones which cause the roots to become unevenly distributed due to displacement by rock fragments. To improve the estimation of water use by lucerne grown in stony soils, we investigated the temporal pattern of water supply and demand, and how this influences crop growth. Methods Naturally occurring stones in the silt loam soil profile were used to reduce the plant available water capacity for three lucerne crops. The Monteith model was fitted against observed soil water to obtain estimates of the extraction rate constant (kl, day −1 ) and extraction front velocity (EFV, mm day −1 ) of lucerne roots. Crop water demand was represented by transpiration losses driven by intercepted solar radiation based on the Bcanopy conductance^approach. Results The Monteith model described the pattern of water extraction for lucerne grown on stony soils. However, a single, constant kl and EFV were inappropriate for characterising water extraction. The main physiological responses to water stress were (i) a reduction in canopy conductance, (ii) a reduction in canopy expansion and (iii) the rearrangement of leaves into a more vertical position. Conclusion This study validated frameworks to quantify lucerne water extraction and transpiration demand which can be used to improve the estimation of water use by lucerne crops.

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The dynamics of lucerne (Medicago sativa L.) yield components in response to defoliation frequency

Cited by 50 publications

References 21 publications

How does defoliation management impact on yield, canopy forming processes and light interception of lucerne (Medicago sativa L.) crops?

How does defoliation management impact on yield, canopy forming processes and light interception of lucerne (Medicago sativa L.) crops?

Growth and phenological development patterns differ between seedling and regrowth lucerne crops (Medicago sativa L.)

Soil water extraction patterns of lucerne grown on stony soils

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