Plant density and geometry in relation to varietal differences and seasonal variations in rainfall for increasing and stabilizing production levels of winter sorghum in drylands
1976
In field trials in 1971-5 winter-grown sorghum cv. CSH 3 and M 35-1 were sown at 36 000-180 000 plants/ha in a Bleasdale semi-circular pattern, single rows 45-95 cm apart or in paired rows 60-100 or 20-40 cm apart. Opt. plant population was low when moisture was limited in 1972-3 when a population density of 36 000 plants/ha gave the highest grain yields. In dry yr, CSH 3 gave higher yields and late types failed. At favourable moisture levels cv. CSV 7R responded to higher plant densities than M 35-1. Plant density rather than plant rectangularity tended to be more critical for successful grain production. When post-sowing rains failed, thinning of plants at the age of 30-35 days proved beneficial
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