Water productivity for sugar and biomass of sugarcane varieties/Produtividade da agua em acucar e biomassa de variedades de cana-de-acucar
The aim of this study was to evaluate the water productivity into biomass and into sugar for 23 sugarcane varieties (second ratoon crop) under two levels of drip irrigation. Two experiments were conducted in a greenhouse. Experiment 1 comprised nine sugarcane varieties grown in a clay soil and Exper...
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Published in | Revista brasileira de engenharia agrícola e ambiental Vol. 21; no. 9; p. 618 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | Spanish |
Published |
ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior
01.09.2017
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Subjects | |
Online Access | Get full text |
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Summary: | The aim of this study was to evaluate the water productivity into biomass and into sugar for 23 sugarcane varieties (second ratoon crop) under two levels of drip irrigation. Two experiments were conducted in a greenhouse. Experiment 1 comprised nine sugarcane varieties grown in a clay soil and Experiment 2 was composed of 14 varieties in a sandyloam soil. Moreover, two irrigation treatments were adopted: T100--full irrigation with 100% crop evapotranspiration replacement, maintaining soil moisture near field capacity for each variety; and T70--irrigation with 70% T100 water depth. Water productivity was evaluated in terms of stem fresh biomass ([WP.sub.FB]) and sugar ([WP.sub.GSY]). The results showed that [WP.sub.FB] ranged from 11.45 to 18.45 kg [m.sup.-3]. The highest values were observed for varieties CTC14, CTC6, RB867515, and SP81-3250 (in T100) and for the varieties CTC6 and CTC14 (in T70). The [WP.sub.GSY] values ranged from 1.68 to 2.22 kg [m.sup.-3], with emphasis placed on CTC6, RB9675-15, SP81-3250, and RB925211 (in T100) and on CTC6, CTC14, and SP81-3250 (in T70). Key words: deficit irrigation second ratoon evapotranspiration Objetivou-se, neste estudo, avaliar a produtividade da agua em biomassa e acucar de 23 variedades de cana-de-acucar (segunda soqueira) irrigada por gotejamento sob dois niveis de irrigacao. Dois experimentos foram instalados e conduzidos em casa de vegetacao. Experimento 1: nove variedades em um solo argiloso e Experimento 2: 14 variedades em um solo franco-arenoso. Dois tratamentos de irrigacao foram adotados: T100--plenamente irrigado com reposicao de 100% da evapotranspiracao de cada variedade, mantendo a umidade do solo proximo a capacidade de campo; e T70--irrigacao com 70% da lamina aplicada no tratamento T100. Avaliaram-se a produtividade da agua em biomassa fresca de colmo ([PA.sub.BFC]) e a produtividade da agua em acucar ([PA.sub.RBA]). Houve variacao na [PA.sub.BFC] de 11,45 a 18,45 kg [m.sup.-3]. Observaram-se os maiores valores nas variedades CTC14, CTC6, RB867515 e SP81-3250 (T100) e nas variedades CTC6 e CTC14 (T70). A [PA.sub.RBA] variou de 1,68 a 2,22 kg [m.sup.-3], destaque para as variedades CTC6, RB967515, SP81-3250 e RB925211 em T100 e CTC6, CTC14 e SP81-3250 em T70. Palavras-chave: irrigacao com deficit segunda soqueira evapotranspiracao |
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ISSN: | 1415-4366 1807-1929 |
DOI: | 10.1590/1807-1929/agriambi.v21n9p618-622 |