Experimental design factors affecting error variation in orchardgrass. Agron.J. 88:745-749 Bivariate analysis of variance of yield data from intercropping experiments. Mansoura J. Agric. Sci. 23(7):2981-2990. Analysis of variance of nitrogen fertilizer rates having a zero amount applied to three maize cultivars. Minufiya J. Agric. Res. 24:425-439. Spatial analysis of barley yield trial data:Different approaches. The 4th Sci. Conf. Agric. Sci., Assiut Univ., 7-9 December, Egypt. Faba bean cultivars fertilized with phosphorus assessed for precision, and bias of yield estimation techniques, and for yield component power and sample size. Moshtohor Annals of Agric. Sci. 42(2):975-988. Nonparametric analysis of a two-factor ANOVA using rank-based methods. The 11th Agronomy Conf., Assiut Univ., 15-16 November, Egypt Linear and nonlinear-segmented models describing response of maize grain yield to nitrogen fertilization. The 11th Agronomy Conf., Assiut Univ., 15-16 November, Egypt Checking Violation of Assumptions Underlying the Analysis of Variance. Annals of Agric. Sci., Moshtohor. The coefficient of variation as a measure of field trial validity. Annals of Agric. Sci., Moshtohor. Nasser, K.B. El-Gizawy, and M.H.A. Tageldin Maize yield and nitrogen use efficiency components in relation to nitrogen, cultivars, and biofertilizer. 1st. Egyptian & Syrian Conf. on Agriculture and Food in the Arab World. El Minia University. El Minia. 8-11 December Yield and resource use efficiency parameters of potato-maize intercropping patterns. Ann. Agric. Sci., Moshtohor 36(1) 117-132. Forage yield and weed Biomass of Egyptian clover as affected by preceding crop residue tillage systems. Annala of Agric. Sci., Moshtohor 35(3):1109-1121 .Response of faba bean grown under various plant spacing to phosphorus and foliar iron. Proc. 1st Scientific Conf. Agric. Sci., Assiut Univ., Assiut. . Faba bean, wheat yields and weeds in tilled and non-tilled crop residues. Zag. J. Agric. Sci. 24(3):357-374. BREEDING FOR GRAIN YIELD, YIELD COMPONENTS AND QUALITY TRAITS IN YELLOW MAIZE (Zea mays, L.) MUTAGEN-INDUCED CHANGES IN GENETIC VARIANCE AND HERITABILITY ESTIMATES FOR PEANUT SEED YIELD TRAITS ESTIMATION OF PHENOTYPIC AND GENOTYPIC STABILITY FOR SOME WHEAT GENOTYPES ESTIMATION OF PHENOTYPIC AND GENOTYPIC STABILITY FOR SOME WHEAT GENOTYPES HETEROSIS AND COMBINING ABILITY FOR YIELD AND ITS COMPONENTS, EARLINESS, TOTAL SHEDDING AND RESISTANCE TO DISEASES AND INSECTS IN FABA BEAN (Vicia faba L.) Maize Yield and Nitrogen Use Efficiency Components in Relation to Nitrogen, Cultivars, and Biofertilizer