unidades térmicas e produtividade em genótipos de milheto semeados em duas épocas thermal unities and yield of pearl millet genotypes sown in two seasons

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ID: 204549
2005
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Abstract
O objetivo deste trabalho foi avaliar o acúmulo de unidades térmicas (UT) e de biomassa em genótipos de milheto semeados nas águas e na seca, sem irrigação e adubação, em delineamento experimental de blocos ao acaso. Nas águas, o ciclo do BRS 1501 foi de 76 dias, com 1.239 UT, e ENA 1 teve ciclo de 82 dias, com 1.325 UT, sem diferenças de produtividade de biomassa e grãos. O genótipo Souna III acumulou 1.352 UT, com a maior produção de biomassa, mas não de grãos. Na floração, nessa época, BRS 1501 acumulou menos UT (517 UT) e menos biomassa, enquanto ENA 1 acumulou 545 UT e mais biomassa. Na seca, BRS 1501 teve ciclo de 80 dias, tendo requerido 1.123 UT, enquanto ENA 1 teve ciclo de 76 dias, com 1.074 UT; não houve diferença significativa na produção de biomassa e grãos. Na floração, nessa época, ENA 1 acumulou 447 UT e o BRS 1501, 461 UT. Não houve diferença no acúmulo de biomassa. O genótipo ENA 1 pode ser usado para a produção de biomassa, no sistema de plantio direto, e BRS 1501, para a produção de biomassa e de grãos, principalmente na seca.
The aim of this work was to evaluate the accumulation of thermal unities (TU) and biomass on pearl millet genotypes sown in rainy and dry seasons, without fertilization or irrigation, in a randomized complete block design. In the rainy season, the BRS 1501 cycle was 76 days, requiring 1,239 TU, while ENA 1 had a cycle of 82 days, with 1,325 TU, both with the same biomass and grain yield. The genotype Souna III accumulated 1,352 TU; its biomass yield was the highest. At flowering, in the rainy season, BRS 1501 accumulated 517 TU, with the lowest biomass, while ENA 1 accumulated 545 TU and higher biomass. At the dry season, BRS 1501 showed a cycle of 80 days, requiring 1,123 TU, while ENA 1 had a cycle of 76 days, with 1,074 TU, with no significant difference for biomass and grain yield. At flowering, in this season, ENA 1 and BRS 1501 accumulated 447 TU and 461 TU, respectively, and there was no significant difference for biomass. The genotype ENA 1 can be used for biomass production for minimal tillering cultivation, and BRS 1501, for biomass and grain production, especially in the dry season.
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Authors ;Antonio Carlos Torres da Costa;José Geraldo;Maurício Ballesteiro Pereira;Carlos Pimentel
Journal proc - the fourth ieee workshop on software technol for future embedded and ubiquitous syst, seus 2006 andthe second int workshop on collaborative comput, integr, and assur, wccia 2006
Year 2005
DOI
10.1590/S0100-204X2005001200003
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2005001200003
Keywords
biomass

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