Effect of urea and its time of application with Sarwala on sorghum production in Gedarif rainfed area

Lotfie A. Yousif, Musa B. Taha, Hanan A. Sulman, Alawi O. Hassan


Field experiments were carried out at Gedarif rainfed area, eastern Sudan, during the seasons of 2001/02 and 2002/03, to study the effect of urea and its time of application on striga, other weeds and sorghum grain yield as well as its profitability when practicing Sarwala with and without urea (46% N). Urea (39 kg/fed) was added at seeding, at Sarwala and at 15 days after Sarwala. Sarwala was carried out 25-30 days from crop emergence. The results showed that there were no significant differences between the treatments in percent reduction of sorghum plant, striga and other weeds population. Sarwala with and without the addition of urea reduced crop, striga and other weeds population by 55.9%, 69.5% and 72.5%, respectively. Sarwala with urea application increased sorghum grain yield by 73% over Sarwala only. The increase in sorghum grain yield due to urea application at seeding, at Sarwala and at 15 days after Sarwala was 80%, 96% and 42%, respectively. The effect of fertilizer was more marked in the season 2001/02, which had higher rains. Applying urea at Sarwala gave the highest grain yield (497.6 kg/fed). The later process is practically feasible since Sarwala and urea application can be performed at the same time using the same implement. Urea application at Sarwala was more profitable, the rate of return ranged from 52.5% to 60.6% compared to farmers' practices.

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