|Author:||Jacobs, J. ; Ward, G.|
|Book Group Author:||NA|
This study was conducted in Victoria, Australia, to determine the effect of different irrigation strategies on dry matter (DM) yield, water use efficiency (WUE) and marginal water use efficiency of perennial ryegrass (Lolium perenne cv. Matrix), millet (Echinochloa utilis cv. Shirohie) and two forage brassicas (Brassica campestris cv. Hunter and B. napus cv. PG545). Irrigation treatments were dryland control (A), irrigated to 100% (B) and 50% (C) of estimated requirements each week and 50% (D) of estimated requirements every second week. At each irrigation level, nitrogen (N) was applied at either 50 or 100 kg/ha after each grazing. Irrigation treatments were imposed from early November until late March. Where forages were irrigated weekly (B and C) there were higher (P<0.05) DM yields than for the dryland treatment (A). Application of N at the higher rate led to higher (P<0.05) DM yields for the perennial ryegrass and PG545. Total WUE was higher (P<0.05) for the dryland treatment (A) than for the fully irrigated treatment (B) for all forages. Application of N at the higher rate also improved (P<0.05) WUE for perennial ryegrass and PG545. The forages used in this study all responded to irrigation, with the degree of response dependent upon the depth of water applied.
|Pages:||143 - 147|
|Journal:||Agronomy New Zealand|
application rates, crop yield, irrigation, nitrogenfertilizers, plant water relations, water use efficiency, Australia,Victoria, Brassica campestris, Brassica napus, Echinochloa utilis,Lolium perenne, Brassica, Brassicaceae, Capparidales, dicotyledons,angiosperms, Spermatophyta, plants, eukaryotes, Echinochloa, Poaceae,Cyperales, monocotyledons, Lolium, Australasia, Oceania, DevelopedCountries, Commonwealth of Nations, OECD Countries, Australia,Capparales, watering, Forage and Fodder Crops (FF007) (New March 2000),Plant Water Relations (FF062), Plant Production (FF100), Fertilizers andother Amendments (JJ700), Soil Water Management (Irrigation andDrainage) (JJ800) (Revised June 2002) [formerly Soil Water Management]