A Green house experiment was conducted at Farm of the Faculty of Agriculture, Sudan University of Science and Technology at Shambat during the period of 17th June to 23rd October 2014. The experimental treatments arranged in completely randomized design with four replications. Six genotypes of sorghum (Sorghum bicolor L. Moench) of Sudanese origin ( Wad ahmed , Bashier, Geshesh and Culom Abu 7 and Kolklo designated as  V1, V2, V3 ,V4, V5, and V6 , respectively. Plants were grown in pots and they were subjected to either well-watered (W0) or stressed(W1)conditions. Characters studied were Stomatal conductance, Transpiration rate,  Specific flag leaf area SFLA and Relative water content RWC, Water use efficiency  WUE, Net assimilation rate NAR and Proline content. The results revealed that water stress and cultivars showed significant differences on (stomatal conductance, transpiration rate, specific leaf area and osmotic adjustments). Moreover the significant decrease in  aforementioned traits due to sowing of V2 and V3cultivars  under water stress was generally associated with significant decreases in NAR, RWC,  WUE and proline content. So, these traits help to identify characters associated with water-stress tolerance of sorghum. In conclusion the two sorghum cultivars V2 andV3 outperformed the other cultivars under the most view of points.

Afield experiment was conducted for two consecutive winter seasons during 2012/2013 and 013/ 2014 in the Demonstration Farm of the Faculty of Agriculture, University of Kassala at New Halfa, Sudan to study the effects of watering interval and sowing date on yield components of maize. The experiment was laid out as split-plot trail arranged in RCBD with 4 replications. The watering intervals were designated as W1, W2 and W3 where plots were irrigated every 10, 15 and 20 days, respectively. At five sowing dates, 15th Oct, 30th Oct, 15th Nov, 30th Nov and 15th Dec were designated as S1, S2, S3, S4 and S3, respectively. In both seasons, the differences among the three watering intervals, sowing dates and the interaction treatments were significant (p< 0.01) for cob length, cob diameter, number of seeds per cob, number of seeds per row, 100-seed weight and grain yield (kg/ha). The highest grain yield (9890 kg/ha) was recorded for the frequent watering interval under first the sowing date. In conclusion, the application of the short watering interval (10 days) and first sowing date (15th Oct.)  Solely or their interaction enhanced maize grain yield production.

A field study was conducted, in order to evaluate the influence of growth and phonological attributes on maize production under water stress at various sowing dates, during 2012/2013 and 013/ 2014 in the Demonstration Farm of the Faculty of Agriculture, University of Kassala at New Halfa, Sudan.The experiment was laid out as split-plot trail arranged in RCBD with 4 replications. The watering treatments were irrigation every 10, 15 and 20 days. At five sowing dates, 15th Oct, 30th Oct, 15th Nov, 30th Nov and 15th Dec. In the two seasons, the prolonged watering intervals 15 and 20 days hastened maize flowering relative to ten days watering interval by more than 3.18% and 3.15%, respectively. The differences among the five sowing dates were highly significant (P≤ 0.01) in the most measured traits in both easons. Whereas, the highest grain yield was produced from first two sowing dates (15th October then followed by 30th October) particularly under ten days watering interval. The increase in yield was associated with significant increases in most of yield related parameters (dry weigh, leaf area and physiological maturity). The positive strong correlations between these characters and grain yield indicated their high contribution to final grain yield.