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INTERFERENCE OF SPACING ON THE GROWTH AND BIOMASS OF SWEET SORGHUM

Authors: Silva, Tatiana Maria da; Nogueira, André Luis da Silva Parente; Oliveira, Alexandre Bosco de; Viana, Italo Emerson Trindade; Moura, Joana Gomes de; Oliveira, Lamartine Soares Cardoso;

INTERFERENCE OF SPACING ON THE GROWTH AND BIOMASS OF SWEET SORGHUM

Abstract

INTERFERÊNCIA DO ESPAÇAMENTO NO CRESCIMENTO E BIOMASSA DE SORGO SACARINO O experimento foi conduzido na Fazenda Experimental Vale do Curu – Pentecoste/CE da Universidade Federal do Ceará, com o objetivo de avaliar a interferência do espaçamento no crescimento e na produção de biomassa do sorgo sacarino. O cultivar BRS 511 foi analisado em dois experimentos com delineamento em blocos casualizados, o primeiro, crescimento em função do espaçamento entrelinhas em esquema de parcela subdividida. O segundo, biomassa em função da densidade de plantio, em esquema fatorial. Avaliou-se as variáveis altura de plantas (AP), diâmetro do colmo (DC), angulação da folha +3 (AF 3+), clorofila A e B, relação clorofila A/B e clorofila total, para o experimento I. Já para o II, foram avaliadas a massa fresca e seca das folhas (MFF/MSF), do colmo (MFC/MSC) e total (MFT/MST). A redução do espaçamento entrelinhas acarretou um menor crescimento das plantas e a biomassa apresentou maiores valores nos menores espaçamentos entrelinhas e entre plantas. Em Pentecoste – CE, para o crescimento do cultivar BRS 511, recomenda-se o espaçamento entrelinhas de 70 cm. Para a biomassa do sorgo sacarino, recomenda-se reduzir a densidade de plantas para 50 cm entrelinhas e 0,8 cm entre plantas, obtendo-se 250.000 plantas por hectare.Palavras-chave: Sorghum bicolor, etanol, densidade de plantas, semiárido. ABSTRACT: The experiment was conducted at the Vale do Curu Experimental Farm of the Federal University of Ceará in Pentecoste in the State of Ceará, Brazil. The aim was to evaluate the interference of spacing in the growth and biomass production of sweet sorghum. The BRS 511 cultivar was analysed in two experiments in a randomised block design; the first, for growth as a function of the inter-row spacing, in a scheme of subdivided plots, and the second, in a factorial scheme, for biomass as a function of planting density. The following variables were evaluated in Experiment I: Plant height (HP), stem diameter (SD), +3 leaf angulation (LA+3), chlorophyll a and b, the chlorophyll a to b ratio and total chlorophyll. The fresh and dry weight of the leaves (LFW/LDW) and the stems (SFW/SDW), and the total fresh and dry weight (TFW/TDW) were evaluated in Experiment II. A reduction in the inter-row spacing resulted in less plant growth; biomass showed higher values at the smallest spacings between rows and between plants. In Pentecoste, an inter-row spacing of 70 cm is recommended for growing the BRS 511 cultivar. For sweet-sorghum biomass, a reduction in plant density to 50 cm between rows and 0.8 cm between plants is recommended to obtain a yield of 250,000 plants per hectare.Keywords: Coffea canephora, estrobilurinas, Hemileia vastatrix, respostas fisiológicas, triazóis.

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
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