Yield, yield components and shoot morphology of four contrasting lucerne (Medicago sativa) cultivars grown in three cool temperate environments

Understanding which component has the greatest influence on yield is vital when managing lucerne (Medicago sativa) crops to maximise the production of high-quality forage. However, both yield components and plant morphology are affected by interactions between environment conditions and plant genetics. Field experiments across three environments (dryland at Cambridge: 500 mm annual rainfall, brown sodosol soil type; dryland at Elliott: 1200 mm annual rainfall, red ferrosol soil type; and irrigated at Elliott) in Tasmania, Australia were undertaken to investigate the yield, yield components and plant morphology of four lucerne cultivars; DuPuits, Grasslands Kaituna, SARDI 7 and SARDI 10 under cutting. The effect of cultivar on dry matter (DM) yield was different in each environment, with Grasslands Kaituna achieving the highest yield (P 0.05) occurred under irrigation. Stepwise linear regression consistently confirmed mass per shoot as the yield component with the greatest influence on DM yield for all cultivars and environments. Shoot density also had an influence on DM yield in two of the three environments. DuPuits had the highest leaf : stem ratio in all three environments and slower morphological development in two of the environments. Management practices across all environments and cultivars should aim to increase mass per shoot to maximise yield. Of the cultivars examined Grasslands Kaituna is the most appropriate for dryland conditions in Tasmania, while all cultivars examined were suited to production under irrigation.

[1]  R. Rawnsley,et al.  Genotype by environment interactions of lucerne (Medicago sativa L.) in a cool temperate climate , 2010 .

[2]  B. Joern,et al.  The Long-Term Impact of Phosphorus and Potassium Fertilization on Alfalfa Yield and Yield Components , 2007 .

[3]  A. Humphries,et al.  Preliminary evaluation of diverse lucerne (Medicago sativa sspp.) germplasm to identify new material for livestock and cropping based farming systems in Australia , 2006 .

[4]  C. Sheaffer,et al.  Five decades of alfalfa cultivar improvement: impact on forage yield, persistence, and nutritive value , 2006 .

[5]  K. M. Pollock,et al.  Herbage production, persistence, nutritive characteristics and water use of perennial forages grown over 6 years on a Wakanui silt loam , 2005 .

[6]  B. Joern,et al.  Influence of Phosphorus and Potassium on Alfalfa Yield and Yield Components , 2005 .

[7]  P. Annicchiarico,et al.  Use of artificial environments to reproduce and exploit genotype × location interaction for lucerne in northern Italy , 2004, Theoretical and Applied Genetics.

[8]  C. Huyghe,et al.  Within- and among-cultivar genetic variation in alfalfa : Forage quality, morphology, and yield , 2000 .

[9]  J. Volenec.  Physiological Control of Alfalfa Growth and Yield , 1999 .

[10]  L. S. Pereira,et al.  Crop evapotranspiration : guidelines for computing crop water requirements , 1998 .

[11]  R. Isbell.  Australian Soil Classification , 1996 .

[12]  M. Hill.  Potential adaptation zones for temperate pasture species as constrained by climate: a knowledge-based logical modelling approach , 1996 .

[13]  Ronald M. Jones,et al.  Stand Dynamics and Yield Components of Alfalfa as Affected by Phosphorus Fertility , 1993 .

[14]  D. Gramshaw,et al.  Effect of cutting interval and winter dormancy on yield, persistence, nitrogen concentration, and root reserves of irrigated lucerne in the Queensland subtropics , 1993 .

[15]  G. Lodge.  Management practices and other factors contributing to the decline in persistence of grazed lucerne in temperate Australia: a review , 1991 .

[16]  M. D. Rumbaugh,et al.  World Distribution and Historical Development , 1988 .

[17]  J. Cherney,et al.  Yield Components, Plant Morphology, and Forage Quality of Alfalfa as Influenced by Plant Population 1 , 1987 .

[18]  J. Douglas.  The production and utilization of lucerne in New Zealand , 1986 .

[19]  G. Lodge.  Yield and persistence of irrigated lucernes cut at different frequencies, at Tamworth, New South Wales. , 1986 .

[20]  W. F. Wedin,et al.  Forage Quality in Stratified Canopies of Alfalfa, Birdsfoot Trefoil, and Red Clover1 , 1985 .

[21]  D. Gramshaw,et al.  Performance of North American and Australian lucernes in the Queensland subtropics 2. Yield and plant survival in irrigated stands , 1985 .

[22]  D. Gramshaw,et al.  Performance of North American and Australian lucernes in the Queensland subtropics 3. Yield, plant survival and aphid populations in raingrown stands , 1985 .

[23]  A. Gleeson,et al.  A comparison of methods of estimating lucerne population for monitoring persistence , 1984 .

[24]  Gary W. Fick,et al.  Quantifying Morphological Development of Alfalfa for Studies of Herbage Quality , 1981 .

[25]  G. Leach.  The relation between lucerne shoot growth and temperature , 1971 .

[26]  D. A. Miller,et al.  Alfalfa Yield Components in Solid Seedings 1 , 1969 .

[27]  G. Leach.  Shoot numbers, shoot size, and yield of regrowth in three lucerne cultivars , 1969 .

[28]  G. Leach.  The growth of the lucerne plant after cutting: I. The effects of cutting at different stages of maturity and at different intensities , 1968 .

[29]  H. Daday,et al.  Performance and interactions in varieties of lucerne (Medicago sativa L.) , 1961 .

[30]  V. Rogers.  Lucerne variety trials at Deniliquin, N.S.W. , 1961 .