The path coefficient analysis was employed to determine the contribution of boll number per plant, boll weight and seed index characters to the variation in seed-cotton yield per plant, in the American and Egyptian cotton varieties; McNair 220 and Giza 75 respectively. Data obtained from yield trials carried out at Fayoum Experimental Farm, Faculty of Agriculture, in two growing seasons, 1982 and 1983, were used in this analysis. It was found that boll number per plant had the greatest contribution to seed cotton yield in both American and Egyptian cotton varieties. Selection for number of bolls/plant and boll weight in American Upland cotton accounts for about 75 % of the yield. While in Egyptian cotton, number of bolls/plant and boll weight account for about 60 % only of yield. The arrangement of the components contributing to plant yield, according to their relative importance in McNair 220 variety was: (1) The direct effect of bolls/plant. (2) The direct effect of boll weight. (3) The joint effect of number of bolls with boll weight. While in Giza 75 variety the arrangement was as follows: (1) The direct effect of number of bolls per plant. (2) The joint effect of number of bolls with boll weight. (3) The direct effect of boll weight.
Two field experiment were carried out at Ismailia Agricultural Research Farm Station located at 30º 35´ 41.901˝ N for Latitude and 32º 16´ 45.834˝ E for Longitude, Egypt, during two successive summer seasons of 2011 and 2012 to investigate the effect of irrigation water intervals (6, 9 and 12 days), compost rates (0, 5 and 7 ton/fed) and bacterial inoculation (mixture of Serratia sp., B. polymyxa and Ps. fluorescens) on sesame productivity "variety Shandaweel 3" grown in sandy soil using sprinkler irrigation system. The experiments were laid out in a split-split plot design with three irrigation intervals as main plots and the three compost rates as sub-plots, while inoculation treatments randomly allotted in sub-sub plots. All sesame yield and its attributes was highly significant affected by the duration of irrigation intervals and there was an inverse relationship between increasing the length of irrigation intervals and the studied yield characters. Irrigation at 6 day interval produced the highest values of sesame yield and yield attributes compared to other water regimes. Also, data exerted that the rate of promotion in the studied sesame yield and its attributes increased gradually as the rate of compost manuring increased. Sesame yield achieved the highest productivity as a result of soil manuring with 7 ton compost/fed followed by 5 ton compost/fed. On the other hand, inoculation with mixture of tested rhizobacteria exerted a salient superiority in values of sesame yield and its attributes relative to uninoculated treatment. The interaction effect among irrigation water intervals, compost rates and bacterial inoculation were significant on all estimated traits, except, plant height, height of first capsule, 1000seed weight and oil%. Furthermore, oil yield/fed was positively and highly correlated with all estimated traits. As a results of this study indicated that obtaining the highest sesame seed and oil yields/fed occurred when the crop was irrigated interval as narrow as possible up to 6 days interval along with inclusion of 7 ton compost/fed and rhizobacterial inoculation.
The physical properties of cotton fibers for the successive age of development were studied in three different periods. Three cultivars of Egyptian and Upland cottons; Giza 75, McNair 220 and Tamcot H. 37, were planted at Fayoum Experiment Farm, Faculty of Agriculture in 1984 season. Fiber properties were studied on samples obtained from five successive stages of boll development in three different periods. Data obtained revealed that fibers from both Egyptian and Upland cultivars showed substantial increment in micronaire reading up to 42 days after flowering. Micronaire reading showed a trend similar to fiber maturity percentage in studied cultivars.
Within each period, fibers tended to be stronger, more extensible, tougher and have higher stiffness with the increase in boll age. The rate of increment in the successive boll ages for fiber strength and elongation characters were markedly higher in the Egyptian cultivar than the American upland cultivars, especially in the younger boll ages. Fiber length was slightly affected by the environment growth conditions. However, the increase in fiber length was progressive from the age of 21 days up to the age of 35 days.
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