farm during the season 2009/10 to study genetic variability and correlation between yields, yield components in some rice genotypes. The experiment was laid out in a randomized complete block design (RCBD) with three replications. Seven characters were measured including yield, yield components. Phenotypic ( 2 p h δ ) and genotypic ( 2 g δ) variances, phenotypic (PCV) % and genotypic (GCV) %, coefficients of variation were estimated. Phenotypic and genotypic correlation between characters was determined. The results showed that there were highly significant differences (p≤0.01) between the most of the characters under study except for percentage of unfilled grains per panicle (%). The highest values of phenotypic and genotypic variance were recorded by yield kgha -1 Also grain yield was attained the highest values of phenotypic and genotypic coefficients of variation. Positive phenotypic and genotypic correlation coefficient was detected between grain yield and number of filled grains per panicle, harvest index, panicle length and number of grains per panicle. The present study revealed that there was highly genetic variability among the tested genotypes, indicating that it could be used for further improvement in rice breeding.

the Demonstration Farm, Shambat, during two successive winter seasons of 2011/2012 and 2012/2013 under irrigation conditions to study the effect of bio-fertilizer (Effective Microorganisms, EM) on two maize (Zea mays L.) cultivars for some growth and yield characters using a split plot design with four replications. The liquid bio-fertilizer levels were (Zero, 06.25, 12.5, 18.75 and 25.00 L/Ha) corresponding to F1, F2, F3,F4 and F5 treatments. The two maize cultivars were HUDAIBA (HD) and MUGTAMA45 (MG). The results revealed that, Plant height, stem diameter, leaf area, 100-grain weight and grains number per cob were increased due to the increase in level of biofertilizer. Also, the aforementioned characters were significantly increased for HD cultivar particularly under application of F4 and F5 levels. Further, the highest grain yield was obtained from application of F4 dose to the two cultivars in the both seasons. This high response of the two maize cultivars to bio-fertilizer could be of a great value in using it in maize nutrition in the Sudan.

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to study the effect of nitrogen fertilizer on two local cultivars of pearl millet (Wad Ahana and Dembi) under irrigation conditions. The experiments were conducted by using a split plot arrangement, two cultivars as main plots and the five nitrogen levels as sub plots. The parameters measured were fresh weight (kg), dry weight (kg), plant height (cm), number of tillers/plant, stem diameter (cm), number of leaves/plant and forage fresh weight (t/ha). The statistical analysis was recorded to separate the means. The results revealed positive significant effects on fresh weight, dry weight, number of leaves/plant and forage yield which indicate the ability to grow millet successfully during April as a forage crop. The results recorded that additional nitrogen rate of 120 kg N/fed obtained significant effects in both seasons. The results showed that Dembi cultivar has a wide response to nitrogen fertilizer under irrigation conditions in both seasons. This study cleared that local cultivars of pearl millet could not obtain positive grain yield due to the effect of temperature and a long day light in April -July, but it was good for forage yield. Furthermore, local cultivars of millet need more genetic and selective experiments to create a new resistant type.