Title: SOURCES AND NITROGEN RATES IN COVERAGE AT THE GRAIN SORGHUM IN THE INTERCROP SEASON
Abstract: Nitrogen top dressing fertilization is an unusual practice in off-season grain sorghum so that the production of straw and grains of sorghum is done using residues of the fertilization of the summer crops. This study objectified to evaluate the response of off-season grain sorghum crop to doses and sources of nitrogen applied as top dressing. Treatments consisted of the combination of two nitrogen sources (urea and ammonium sulfate) and five nitrogen doses (0, 20, 40, 60 and 80 kg.ha-1) applied at the panicle initiation stage (EC2). A randomized blocks design was used in a 2 x 5 factorial scheme, with four replications. Plant height, culm diameter, grain number per panicle, plant dry matter, harvest index, weight of 100 grains and grain yield were evaluated. Ammonium sulfate increased plant height. The hybrid evaluated showed a linear relation of plant dry matter and nitrogen top dressing. The ammonium sulfate caused higher increase in dry matter yield compared to urea. A quadratic relationship between nitrogen top dressing and grain yield was observed, obtaining 3389.4 kg.ha-1 with 65.10 kg.ha-1 of top dress nitrogen.
Publication Year: 2011
Publication Date: 2011-01-01
Language: en
Type: article
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Cited By Count: 1
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