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Influence of Soil Incorporation on Herbicide Performance in Sorghum¹

Experiments were conducted at Lincoln, North Platte, and Alliance, Nebraska, during 1965 and 1966 to determine the effect of herbicides, herbicide incorporation, and rotary hoeing on ‘Nebraska 505’ sorghum [Sorghum bicolor (L.) Moench.] grown in 50.8-cm rows. Preplant soil incorporation and preemergence herbicide applications were superior to preemergence + shallow incorporation with a rotary hoe in weed control and grain yields. Postemergence rotary hoeing improved weed control and sorghum yields on herbicide treatments. The best treatments were atrazine (2-chloro-4-ethylamlno-6-isopropylamino-s-triazine) at 2.24 kg/ha and atrazine norea [3-(hexahydro-4,7-methanoindan-5-)y-ll, l-dimethylarea] at 0.84 + 1.68 kg/ha (1.12 + 2.24 kg/ha in 1965) + two rotary hoelngs at Lincoln, atrazine at 2.24 kg/ha at North Platte, and rotary hoeings but no herbicide at Alliance. Only at Lincoln did sorghum yields on herbicide-treated plots approach that on handweeded checks. On the low organic matter soils at North Platte and Alliance, atrazine injury limited sorghum yields.

Key Words: Atrazine

² Assistant Professor, North Platte Station; Professor, Department of Agronomy at Lincoln; and Associate Professor, Scons Bluff Station, University of Nebraska, respectively.

Received for publication December 13, 1968.