Managing irrigated sorghum for maximum yield potential – Breeza 2013–14

Abstract

Key findings • Time of sowing 1 (TOS 1) yielded more than time of sowing 2 (TOS 2) in this season, but only by 0.35 t/ha. • Varying hybrid selection had no significant impact on yield at this site in this season. • The 90 cm row spacing in TOS1 and TOS 2 yielded the same as the twin row spacing in TOS1. However, the twin row configuration was lower yielding in TOS 2. • There were no significant yield response associated with varying plant populations under irrigation, with an average site yield of 5.42 t/ha. • In TOS 1 there was a 2.9 t/ha yield benefit from applying 200 kg N/ha compared to the Nil N treatment. In TOS 2 the response was similar to TOS 1 but there was no significant difference between the 100 and 200 N/ha treatments, which were 2.0 and 2.3 t/ha higher yielding than the nil treatment, respectively. • Responses to phosphorus were evident at both sowing times, however the response was only significant when it was coupled with the application of nitrogen.