ARS | Publication request: RESPONSE OF CORN IN THE MIDSOUTH TO HIGH POPULATIONS AND DIFFERENT ROW SPACINGS

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 30, 2003
Publication Date: November 2, 2003
Citation: BRUNS, H.A., ABBAS, H.K. 2003. RESPONSE OF CORN IN THE MIDSOUTH TO HIGH POPULATIONS AND DIFFERENT ROW SPACINGS. AGRONOMY ABSTRACTS. CD ROM.

Technical Abstract: Population stress and N-fertility can influence grain yields and mycotoxin contamination in corn. Irrigated corn was grown at populations of 69,000, 79,000, 89,000, and 99,000 plants per ha, in both 102 cm and 76 cm row spacings at Stoneville, MS. Nitrogen fertility treatments included 112 kg N per ha pre-plant only, 224 kg N per ha pre-plant only, and 112 kg N per ha pre-plant plus 112 kg N per ha at GS V6. In 2002 grain yields were unaffected by population increases in the 102 cm row spacing and tended to decline with increasing populations in the 76 cm row spacing. Yields were lowest with the 112 kg N per ha pre-plant only fertility treatment. Both aflatoxin and fumonisin contamination levels were lower at the higher N-fertility treatments than the 112 kg N per ha pre-plant only treatment. Aflatoxin and fumonisin levels were unaffected by population at the 102 cm row spacing but tended to increase with increasing plant populations in the 76 cm row spacing.