Abstract

POLON-PEREZ, Ricardo et al. Effect of Water Stress on the Ratoon Crop (Oryza sativa L.). First Part. Rev Cie Téc Agr [online]. 2019, vol.28, n.2 ISSN 2071-0054.

The research was conducted at “Los Palacios” Base Scientific and Technological Unit, from 2014 to 2017, on a Gleysol Nodular Ferruginous Petroferric soil, to know the effect of water stress on the ratoon crop in the medium cycle variety J-104. The results showed that the new variant of water managing (water stress with ratoon) significantly outperformed the control production variant. It produced the highest agricultural and industrial yields of the grain. They ranged between 4.7 and 5.8 t. ha-1 and 63.3 and 67.3% whole grains respectively for a height of cut of the plant of 5 cm. The lowest agricultural and industrial yields ranged between 3.1 and 4.4 t.ha-1 and 60.0 and 67.8% of whole grains respectively for the control variant with a height of cut of the plant 20 cm. Water consumption was always lower in the new variant than in the control variant during the years of study. This indicator is very important as a concept of irrigation water economy, a decisive resource for rice production. The industrial quality of the grain was always higher in the variant with water stress in the ratoon crop compared to the control variant; parameters that decide if a rice variety is accepted commercially.

Keywords : rice; water; whole grains; panicles; industrial quality.

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