Abstract
This work was carried out with the objective of studying the influence of salinity on germination and growth of castor bean BRS 149-Nordestina. A completely randomized block design was adopted, combining five levels of irrigation water salinity (0.7; 1.7; 2.7; 3.7 and 4.7 dS m-1, at 25 °C) and five proportions of Na:Ca (9.5:0.5; 7.5:2.5; 5.0:5.0; 2.5:7.5; and 0.5:9.5), with three replications. The observations were made up to 80 days after planting. The salinity did not influence the percentage of germination and the velocity of seedling emergence but the aerial parts were reduced linearly with increase of salinity of irrigation water. The root/shoot ratio increased linearly when the plants were submitted to saline stress. The plant height and phytomass of aerial parts were favored by decrease of Na proportion in the irrigation water.
Key words:
Ricinus communis; saline stress; irrigation
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