Root distribution, nutrient uptake, and yield of two upland rice cultivars under two water regimes


Autoria(s): Crusciol, Carlos Alexandre Costa; Soratto, Rogério Peres; Nascente, A. S.; Arf, O.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

27/05/2014

27/05/2014

31/01/2013

Resumo

Upland rice (Oryza sativa L.) cultivation has been increasing in global importance due to the decreasing water availability for flood- irrigated rice. The use of sprinkler irrigation to supplement rainfall and the identification of cultivars more adapted to lower water availability could be effective alternatives for producing upland rice without yield losses while using less water. The objective of this field study was to evaluate the root distribution, plant nutrition, and grain yield of two drought tolerant upland rice cultivars under two water regimes in the Cerrado Region of Brazil during two growing seasons. The main plots were two water regimes (rainfed and sprinkler-irrigation plus rainfall). Subplots were two upland rice cultivars Carajás and IAC 201. Low water availability reduced root growth by 7% and grain yields were from 2644 to 4002 kg ha-1 on average for rainfed and sprinkler irrigation treatments, respectively. Carajás had a significantly better root distribution, nutrient uptake, and higher grain yield (3732 kg ha-1) compared with IAC 201 (2914 kg ha-1) averaged over two growing seasons and water regimes. There were no treatment interactions. Our results suggest that, even when cultivars with a higher tolerance to less water availability are used, using sprinkler irrigation to augment limited rainfall during dry periods may be a viable method to increase upland rice grain yields. © 2013 by the American Society of Agronomy.

Formato

237-247

Identificador

http://dx.doi.org/10.2134/agronj2012.0298

Agronomy Journal, v. 105, n. 1, p. 237-247, 2013.

0002-1962

1435-0645

http://hdl.handle.net/11449/74440

10.2134/agronj2012.0298

WOS:000314747400027

2-s2.0-84872936630

Idioma(s)

eng

Relação

Agronomy Journal

Direitos

closedAccess

Palavras-Chave #Oryza sativa
Tipo

info:eu-repo/semantics/article