Effect of inorganic nitrogen forms and concentrations on growth of rice genotypes under severe saline condition
(2017) Vietnam Journal of agricultural science — Vol. 15, n° 3, p. 189-197 (2017)
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- Hydroponic and field experiments were conducted to evaluate the effect of three nitrogen (N) rates and two N forms-ammonium nitrate and urea-on growth of rice plant under severe saline conditions. In hydroponics, two salt tolerant cultivars, Cuom and A69-1, were examined at tillering stage. Three concentrations of N-1.4, 2.1 and 2.8 mM were applied to Yoshida solution supplemented with NaCl at 113 mM. In paddy field under severe saline condition, six cultivars, viz. Cuom, Ngoi, Hom rau, A69-1, FL478, and IR28 were used to evaluate growth and yield at three N levels, 45, 68 and 90 kg N ha-1. In hydroponic condition, plant dry weight, number of root tips, total root length, and SPAD value increased with ammonium nitrate concentration. In contrast, all these parameters as well as leaf specific area and N use efficiency decreased with urea concentration in both cultivars. In the paddy field experiment, N forms and levels had no effect on grain yield, but N forms affected 1000-grain weight and number of panicles per plant, whereas N levels increased dry matter weight at dough-ripening stage with N applied. The use of reduced N fertilizer level was suggested for rice under severe saline condition.
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Phan Thi Hong, N., Tang Thi Hanh, Bertin, P., & Pham Van Cuong. (2017). Effect of inorganic nitrogen forms and concentrations on growth of rice genotypes under severe saline condition. Vietnam Journal of agricultural science, 15(3), 189-197. https://hdl.handle.net/2078.5/118376 (Original work published 2017)