Influence of different sowing dates on growth and yield of direct seeded rice (Oryza sativa L.) in semi-arid zone (Sudan)


The aim of this study was to investigate the effect of different sowing dates on paddy yield and yield components of direct seeded rice (Oryza sativa) variety Nerica.4. The field experiments were carried out during two consecutive cropping seasons of 2008 and 2009 at White Nile Research Station Farm, Agricultural Research Corporation (ARC), Kosti, White Nile State, Sudan. Twelve successive sowing dates were conducted by the difference of 15-days between any sowing date and the next one. Eleven growth and yield characters were measured.

The study was laid out in a randomized complete block design with three replications. The different sowing dates revealed significant effect on all the studied growth and yield characters. The results showed early sowing dates produce a high grain yield more than later ones, delaying sowing date from 15th July decrease the grain yield (t/ha), this may be attributed to the decrease of 1000 grain weight, number of filled grains/panicle and increasing of the percent of unfilled grains/panicle.The grain yield (t/ha) was positively and highly correlated with number of filled grains/panicle and 1000 grain weight. The sowing dates 1st July and 15th July produced the maximum grain yield of (2.9 t/ha-1) and (2.8 t/ha-1), respectively. It could be concluded that the period from the first of July to the mid of it can be considered as the optimum sowing date for direct seeding of the upland rice (variety Nerica.4) at Sudan and under White Nile State condition. Get more articles like this at:

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Originally Published at: Volume 6, Number 6, June 2015 — IJAAR
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