Agronomic studies on soybean (Glycine max (L.) Merrill) in the dry season of the tropics, 1. Limits to yield imposed by phenology [north-western Australia]
1991
Mayers, J.D. (Commonwealth Scientific and Industrial Research Organisation, Kununurra (Australia). Div. of Tropical Crops and Pastures) | Lawn, R.J. (Commonwealth Scientific and Industrial Research Organisation, St Lucia (Australia). Div. of Tropical Crops and Pastures) | Byth, D.E. (Queensland Univ., St Lucia (Australia). Dept. of Agriculture)
In field experiments 10 tropically-adapted genotypes were grown at 3 sowing times using management practices to maximize productivity. Harvest indices were generally large, but maximum seed yields were only c. 3 t per ha, apparently because of inadequate biomass production. Analysis of growth and development suggested that dry matter accumulation during the vegetative phase was limited primarily by cumulative photosynthetically active radiation (PAR) interception by the crop canopy rather than the efficiency of conversion of intercepted PAR. Cumulative PAR interception and canopy leaf area development were constrained by precocious flowering. Yield improvement strategies for the dry season will need to be based on agronomic and-or breeding strategies to enhance canopy development and improve biomass production.
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