Agronomic studies on soybean (Glycine max (L.) Merrill) in the dry season of the tropics, 2. Interaction of sowing date and sowing density [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 3 agronomically improved cultivars and a later-flowering landrace cultivar were tested with management practices designed to minimize constraints on yield. Maximum seed yields were 3.5-4.0 t per ha, with large genotype x sowing date x sowing density interaction. Higher sowing densities stimulated more rapid leaf area development and earlier canopy closure, and enhanced total biomass production. Very high sowing densities were required to maximize yields of most genotypes, while lodging precluded high yield being realized from the greater biomass production of high density sowings of the landrace genotype. Agronomic strategies alone were insufficient to overcome the constraints to yield of present soybean genotypes in the dry season.
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