Seasonal patterns of root C and N reserves of lucerne crops (Medicago sativa L.) grown in a temperate climate were affected by defoliation regime

Teixeira, Edmar; Moot, Derrick J.; Mickelbart, Michael V.

doi:10.1016/j.eja.2006.08.010

Cited by 64 publications

(70 citation statements)

References 18 publications

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“…A proposed explanatory mechanism is that the activity of genes that reduce sink priority of reproductive organs is triggered at short photoperiods (Wallace et al, 1993). Similar seasonal differences in the metabolic activity of lucerne shoots were identified for dry matter partitioning (Avice et al, 2001;Teixeira et al, 2007b) and canopy expansion (Brown et al, 2005b). At photoperiods shorter than the Pp crit of 14 h, Tt 0-bv increased at a photoperiod sensitivity rate (P s ) of 106°Cd h -1 for both crops.…”

Section: Reproductive Developmentmentioning

confidence: 82%

“…Plots (4.4 x 10.0 m) were spring sown on (i) 24 October; (ii) 15 November; (iii) 5 December; and (iv) 27 December in 2000 (Table 1). This provided seedling and regrowth lucerne crops at different stages of (Teixeira et al, 2007b). During these four years of monitoring, irrigation and mineral fertilizer were applied to ensure crop growth and development were unconstrained.…”

Section: Experimental Design and Treatmentsmentioning

confidence: 99%

“…During these four years of monitoring, irrigation and mineral fertilizer were applied to ensure crop growth and development were unconstrained. Detailed descriptions of site management, experimental design and additional measurements for each experiment were published in Teixeira et al (2007b) and Brown et al (2005b).…”

Section: Experimental Design and Treatmentsmentioning

confidence: 99%

“…For the regrowth phase of the crop, the period after first harvest, the responses of lucerne plants to environmental signals and management have been recently quantified experimentally (Brown et al, 2005b;Brown et al, 2006;Teixeira et al, 2007b). These studies have however not provided a direct comparison between seedling and regrowth phases.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Reproductive Developmentmentioning

confidence: 82%

Section: Experimental Design and Treatmentsmentioning

confidence: 99%

Section: Experimental Design and Treatmentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Self Cite

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“…Agronomic management which reduces the optimum canopy expansion rate such as water stress (Fig. 10), inadequate nitrogen supply (Avice et al 2003;Teixeira et al 2008), or short defoliation intervals (Teixeira et al 2007b), will reduce radiation interception, and therefore shoot yield. Furthermore, by maintaining the crop canopy by delaying spring defoliation, a lower proportion of water may be lost via soil evaporation, which was recently shown in wheat by Harrison et al (2011).…”

Section: Agronomic Implicationsmentioning

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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Increasing legume forage productivity through slurry application – A way to intensify sustainable agriculture?

Crotty

Fychan

Sanderson

et al. 2018

Food and Energy Security

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Legume forages are fundamental in the development of sustainable livestock systems, building soil fertility and providing home‐grown protein for ruminant livestock. Legumes derive N from the atmosphere but defoliation reduces N fixation, reducing yield. Livestock, particularly dairy, systems generate considerable quantities of slurry. There is a lack of knowledge on whether this resource can be used sustainably to improve the dry matter (DM) yield of regularly defoliated legumes. An experiment investigated whether applying slurry to red clover (Trifolium pratense), lucerne (Medicago sativa), or hybrid ryegrass (Lolium hybridicum), managed by frequent cutting, would increase DM and nitrogen (N) yield compared with plots without slurry. Treatments were compared within a randomized block design. Plots were harvested for silage on four occasions. Soil P and K indices were maintained at sufficiency levels throughout. Forage DM yields were higher on all plots treated with slurry than those with zero slurry. Overall, legume forages had higher DM yields than ryegrass, with lucerne having the highest DM yield. DM yields decreased at each cut for all forages (p < 0.001); however, forage N content increased after each cut (p < 0.001). Slurry addition increased ryegrass yield at first cut and red clover yield at second cut (p < 0.05) indicating ryegrass needed the nutrient boost to commence growth, while red clover needed it to aid recovery after defoliation stress. N concentration differed between forages, although for ryegrass and red clover there was no difference between slurry treatments (p > 0.05), N was higher in lucerne grown without slurry. Applying slurry to legumes under frequent cutting regimes increased total DM yield but not N yield. Overall, findings demonstrate the potential to use slurry as a resource to intensify sustainable agriculture by increasing the DM yields of frequently harvested forage legumes.

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Seasonal patterns of root C and N reserves of lucerne crops (Medicago sativa L.) grown in a temperate climate were affected by defoliation regime

Cited by 64 publications

References 18 publications

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

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

Increasing legume forage productivity through slurry application – A way to intensify sustainable agriculture?

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