Modeling Shoot and Root Biomass of Lucerne Crops—New Insights on the Seasonality of Dry Matter Partitioning and Root Maintenance Respiration

Teixeira, Edmar; Moot, Derrick J.; Brown, Hamish E.; Monks, David P.

doi:10.1007/978-3-642-01132-0_13

Cited by 1 publication

(1 citation statement)

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“…Table 2 shows yields estimated from these regressions were deviated from the 6 year mean yield by 520 to 1200 kg DM/ha. The reduction in yield per cm, compared with relationships determined for spring, is consistent with previous work which showed remobilisation of root reserves in spring results in higher growth rates than can be explained purely by increases in temperature (Brown et al 2006;Moot et al 2003;Teixeira et al 2009a;Teixeira et al 2009b). In summer, in a water stressed crop, internode length is reduced due to decreased cell expansion, which also decreases canopy light interception.…”

Section: Summersupporting

confidence: 89%

Relationships between dry matter yield and height of rotationally grazed dryland lucerne

Mills¹,

Smith²,

Moot³

2016

Journal of NZ Grasslands

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Between 2009/2010 and 2014/2015 a total of 711 destructive paired samples of total dry matter yield (kg DM/ha) and lucerne height were taken from a grazed dryland lucerne monoculture experiment at Ashley Dene, Canterbury, New Zealand. These were used to develop relationships suitable for on-farm estimates of lucerne. For pre-graze yields, the variation accounted for increased from 59%, based on lucerne height alone, to 84% for the 14 Year/Season combinations. For postgrazing residual DM yields, inclusion of Year as a factor increased the R2 from 0.39 to 0.65. Pre-graze data were also grouped into spring, summer and autumn. These relationships accounted for 54-60% of the observed variation in dryland lucerne. In spring the multiplier was ~95 kg DM/cm and this dropped to ~75 kg DM/ cm for heights measured in the summer. In autumn the multiplier was ~55 kg DM/cm. Lack of stability in the relationships over time could reflect environmental conditions and changes in stand density which height measurements alone cannot account for. Keywords: alfalfa, dry matter yield estimates, height, Medicago sativa L., regression analysis

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Section: Summersupporting

confidence: 89%