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UPLAND RICE CULTIVAR RESPONSES TO ROW SPACING AND WATER STRESS ACROSS MULTIPLE ENVIRONMENTS

Published online by Cambridge University Press:  18 October 2016

ALEXANDRE BRYAN HEINEMANN ,
JULIAN RAMIREZ-VILLEGAS ,
ADRIANO STEPHAN NASCENTE ,
WALMES MARQUES ZEVIANI ,
LUÍS FERNANDO STONE  and
PAULO CESAR SENTELHAS
ALEXANDRE BRYAN HEINEMANN*
Affiliation:
Embrapa Arroz e Feijão (CNPAF), Rodovia GO-462, km 12 Zona Rural, CP. 179, 75375-000, Santo Antônio de Goiás, GO, Brazil
JULIAN RAMIREZ-VILLEGAS
Affiliation:
School of Earth and Environment, University of Leeds, Leeds, LS2 9JT, UK CGIAR Research Program on Climate Change, Agriculture and Food Security (CCAFS), km 17 recta Cali-Palmira, Cali, Colombia International Center for Tropical Agriculture (CIAT), km 17 recta Cali-Palmira, Cali, Colombia
ADRIANO STEPHAN NASCENTE
Affiliation:
Embrapa Arroz e Feijão (CNPAF), Rodovia GO-462, km 12 Zona Rural, CP. 179, 75375-000, Santo Antônio de Goiás, GO, Brazil
WALMES MARQUES ZEVIANI
Affiliation:
Laboratório de Estatística e Geoinformática (LEG), Departamento de Estatística, Universidade Federal do Paraná, Edifício da Administração - 3º andar - Centro Politécnico, CP. 19.081, 81.531-990, Curitiba, PR, Brazil
LUÍS FERNANDO STONE
Affiliation:
Embrapa Arroz e Feijão (CNPAF), Rodovia GO-462, km 12 Zona Rural, CP. 179, 75375-000, Santo Antônio de Goiás, GO, Brazil
PAULO CESAR SENTELHAS
Affiliation:
Departamento de Engenharia de Biossistemas, ESALQ, Universidade de São Paulo, Av. Pádua Dias, 11, Bairro Agronomia, CP. 9, 13418–900, Piracicaba, SP, Brazil
*
§§Corresponding author. Email: [email protected]
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Summary

Upland rice (Oryza sativa L., UR) could be an option under soybean–maize crop rotation system. However, the recommended row spacing for UR (0.30 m) is shorter than that recommended for soybean and corn (0.40 m), limiting the use of UR in this rotation. We hypothesize that cultivar adaptation to wider than recommended row spacing and local environmental conditions harbour significant potential for overcoming the yield constraints of wider row spacing. We evaluated the row spacing effects on rice grain yield and their components in UR cultivars grown under different water deficit conditions. The experiments were designed as a randomized block in a split–split-plot scheme with sites (the cities of Santo Antônio de Goiás, Porangatu and Formoso) as main plots, row spacing (0.25, 0.35, 0.45 and 0.55 m) as the subplots and UR cultivars (one old and two modern genotypes) as the sub-subplots. We found that, in the less stressful environments, the modern cultivars, BRSMG Curinga and BRS Primavera, presented the highest grain yield. By contrast, in environments with moderate to intense water stress, the traditional cultivar, Douradão, presented the best performance, regardless of row spacing used. We conclude that UR is a viable option for soybean–maize rotation systems, as the UR cultivars tested presented no noticeable yield losses when sown with the same row spacing used for soybean and maize crops (0.40 m). In terms of impact, it can lead to an increase in UR cropped area in Brazil, and decrease in dependence on flooded rice harvested in the south of the country.

Type
Research Article
Information
Experimental Agriculture , Volume 53 , Issue 4 , October 2017 , pp. 609 - 626
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Copyright
Copyright © Cambridge University Press 2016 

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