Effect of tidal submergence on potassium nutrition and yield of rice (Oryza sativa L.)

Abstract

Field experiments were conducted at Patuakhali Science and Technology University research farm during 2009 T. Aman season to investigate the effect of tidal submergence on potassium nutrition and yield of rice. The experiment included two levels of irrigation water source-i) tidal water and ii) ground water, and three levels of fertilizers-i) absolute control (no fertilizer), ii) NP (K omission), and iii) NPK (K addition). The rice varieties were BR23 (HYV) and Lalmota (traditional variety). A general increase in growth, yield and yield contributing parameters were found due to irrigation with tidal water. Tidal water contributed about 19% (BR23) and 11% (Lalmota) higher grain yield in Aman season 2009 compared to that grown with ground water. Potassium contents of rice grain and straw were always higher when plants are irrigated with tidal water. In general, tidal submergence increased K uptake of rice. The K uptake by BR23 under tidal water was about 47, 43 and 8 kg/ha more than those recorded with ground water irrigation under absolute control, K omission and K addition treatments, respectively whereas it was 31, 21, and 68 kg/ha, in Lalmota. The results indicated that whether fertilizers were applied or not plants absorb considerable amount of K from tidal water.

Requirement and use efficiency of nitrogen in transplanted Aman rice at Ganges tidal water flooded coastal ecosystem

“…The less severe effects of N deficiency for T. Aman rice may be related tolower yield and, therefore decreased demand and to The supplementary supply of N from tidal water inundation (Rahman et al 2013). Tidal water contains a huge amount of suspended silt and clay particles, which contribute to the N nutrition of the plant (Haque et al 2008;Haque 2010Haque , 2012. In the experiment, the initial soil contained only 0.45 g kg -1 N and 5.6 g kg -1 organic carbon, indicating a very low level of N. However, crop response was not obtained in higher N doses because of dissolved N in tidal water.…”