Field experiments were conducted for two consecutive summer seasons; 2005/06 and 2006/07, at Dongola area-Northern State (Sudan). The objectives were to investigate the effect of irrigation regimes; irrigation water amounts and irrigation intervals, on maize (Zea mays L.) growth and yield in addition to their effect on the soil moisture content. Irrigation water amounts were determined using FAO Penman-Monteith equation (1998) for estimating crop evapotranspiration (ET c ). Three levels of ET c were used; 100%, 75%, and 50% ET c . Three irrigation intervals were imposed; 10, 15, and 20 days. The application of irrigation treatments was started at the third irrigation. The results indicated that maximum plant population and field water use efficiency were obtained at irrigation water amount of 50% ET c in both seasons. Also, 10 days irrigation interval gave the highest values of plant height, cob length, 100-seed weight, grain yield, stover yield, and field water use efficiency.

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A study was carried out at Dongola town-Agjah district (Sudan) for two consecutive summer seasons (2005/06 and 2006/07) to investigate the response of maize (Zea mays L.) growth and yield to irrigation regimes; irrigation water amounts and irrigation intervals, under different tillage practices. Irrigation water amounts used were; 100%, 75%, and 50% FAO Penman-Monteith ET c . The different tillage practices applied were; disc ploughing (20 cm depth) followed by disc harrowing and levelling, chisel ploughing (30 cm depth) followed by disc harrowing and levelling, and no tillage. The irrigation intervals were; 10, 15, and 20 days. The application of irrigation treatments was started at the third irrigation. There were no significant differences (P ≤ 0.05) due to irrigation water amounts, tillage practices, and irrigation intervals treatments combinations on plant height; at 45, 60, and 75 days after sowing, leaf area index at 75 days after sowing, and plant population for both seasons. Also, there were no significant differences (P ≤ 0.05) on yield and yield parameters; cob length, number of rows/cob, number of seeds/cob, 100-seed weight, yield/unit area, stover/unit area, harvest index, and field water use efficiency in both seasons for the treatments interactions. The treatments interactions gave significant difference (P ≤ 0.05) on soil moisture content in one of the two seasons at soil depths of 0-25, 50-75, and 75-100 cm. It was observed that disc ploughing treatment with all combinations of irrigation water amounts and irrigation intervals gave the highest values in both seasons for plant height, leaf area index, and soil moisture content. It was observed that the highest values of field water use efficiency for both seasons were obtained under treatment interactions of disc ploughing treatment, irrigation water amount of 50% ET c , and 10 days irrigation interval.

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The objective was to investigate the effect of treatments interactions of application of irrigation canal sediments, humate fertilizer and irrigation interval on wheat (Triticum aestivum L.) growth and yield attributes in high terrace soils. Treatments were arranged in a split-split plot design with four replicates. Application of irrigation canal sediments constituted three rates (0, 30 and 60 ton/ha), three rates of humate fertilizer were used (0, 2 and 4 kg/fed) and two levels of irrigation interval were imposed (10 and 15 days). The soil of the experimental site is characterized by high amount of sand and low chemical soil fertility and the climatic zone of the area is described as desert. The results showed significant differences (P ≤ 0.05) due to the interactions effect of these three factors on number of plants/m 2 , plant height, number of spikes/m 2 , number of seeds/spike, 1000-seeds weight, grain yield and straw yield for both seasons. Also, treatments interactions had highly significant effects (P ≤ 0.01) on number of tillers/m 2 and harvest index, and very highly significant differences (P ≤ 0.001) on biological yield of wheat in both seasons. The best combination of irrigation canal sediments, humate fertilizer and irrigation interval which gave the highest values of growth, yield and yield components of wheat for both seasons; except for number of plants/m 2 in the second season and straw yield in both seasons, was the interaction effect of application of 60 ton/ha irrigation canal sediments, 4 kg/fed humate fertilizer and 10 days irrigation interval.