Radiation interception, radiation use efficiency and growth of barley cultivars
1993
Goyne, P.J. | Hare, J.M. (Queensland Dept. of Primary Industries, Warwick (Australia). Hermitage Research Station) | Milroy, S.P. (Western Australia Univ., Nedlands) | Lilley, J.M. (Commonwealth Scientific and Industrial Research Organisation, St Lucia (Australia). Div. of Tropical Crops and Pastures)
Dry matter production and utilization of photosynthetically active radiation (PAR) was studied for barley in the field at Hermitage Research Station, Queensland. In 1990, 4 cultivars (Gilbert, Tallon, Grimmett, Skiff) were sown at 3 times and grown with non-limiting soil moisture. In 1991, soil moisture limitations were imposed on 1 sowing of the cultivar Grimmett. The radiation extinction coefficient (k) was 0.41 and did not vary with cultivar, time of sowing or soil moisture availability. Radiation use efficiency (RUE) (based on absorbed PAR and above-ground dry matter) did not change with time of sowing but did vary between cultivars. RUE was highest for Gilbert (2.90 g per MJ), while the other 3 cultivars averaged 2.60 g per MJ. RUE of Grimmett was significantly lower in 1991 (1.48 g per MJ) than in 1990 (2.60 g per MJ), but soil moisture differences in 1991 did not significantly affect RUE. Several factors with possible links with RUE were examined and discussed. Of the variables examined those which showed the strongest relationships with RUE were average daily vapour pressure deficit and average daily minimum temperature.
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