To compare two methods for the establishment of pasture legumes (i) summer sowing where dormant hard-seed is drill sown into the paddock after the crop is harvested; and (ii) traditional sowing where scarified seed is drill sown after the break of the season and knockdown weed control.
Key messages
Traditionally, forage legumes are sown after the main cropping program is completed and require the application of a pre-sowing knockdown herbicide to control established weeds. This treatment seriously reduces early winter pasture production which is then compounded by the slow growth rate of legumes under the cold winter conditions.
Summer sowing offers early winter grazing in a mixed enterprise farm. The technique has the ability to lift the legume component in a pasture which has degraded through a range of factors such as drought and/or intensive cropping. On a farm without grazing animals, summer sowing can be used to produce a green fallow with a high legume content that can be brown manured to provide high nitrogen residues and maximise the organic matter for the benefit of subsequent crops.
Summer sowing reduces establishment cost by firstly, minimising seed processing particularly in the case of serradella where seed extraction is difficult and expensive and secondly, sowing does not require a pre-sowing application of herbicide.
The requirement to sow hard-seeded cultivars in summer or early autumn does lose some of the flexibility to tactically respond to seasonal conditions and this needs to be balanced against the clear productivity advantages demonstrated.
Trial source data and summary not available Check the trial
report PDF for trial results.
Climate
Derived climate information
No observed climate data available for this trial. Derived climate data is
determined from trial site location and national weather sources.
Coorow WA
Mingenew WA
Coorow WA
Mingenew WA
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to
construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol
16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.