This study evaluated the effect of row spacing and plant population of early maturing soybean cultivars on full season or late planting. One cultivar each from maturity group (MG) I, II, III and IV was planted in early December and mid January on a sandy loam soil in the Lower Valley of the Colorado River (39°23'S 62°37'W), Argentina. Soybean was planted in 50-, 35- and 17-cm rows, with different plant populations and they were irrigated. Late-planted soybean resulted in a short reproductive period but the rate of leaf initiation was least affected by the planting date in all MG. High population maximized yield in short-season production but offered little advantage in earlier production. Increasing the seeding rate reduce the time to canopy closure and pod height increased. Generally seed growth rate was high for the mid January planting date but low for the early planting date. Delayed planting reduce yield of all MG cultivars but mainly in MG III. MG IV did not complete its cycle, it was killed by frost.
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