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Al Jīzah, Egypt

Al-Sayed H.M.,Sugar Crops Res Institute | Fateh H.S.,Field Crop Res Institute | Fares W.M.,Field Crop Res Institute | Attaya A.S.,Suez Canal University
American-Eurasian Journal of Sustainable Agriculture | Year: 2012

This work aimed to evaluate some statistical methods that used for estimating the relative contribution of sugar yield factors in sugarcane. Moreover, some agronomic treatments were used which aimed to measure the relationship among sugar yield factors under different degrees of variation. Three treatments of growth promoters (Agrispon, Stimulate and without treatment as a control) were applied on three genotypes of sugarcane namely: G. 54-9, G. 99-103 and Phi 8013. Five statistical procedures were used to study the relationship between the sugar yield and its components using the data collected over the two seasons. The five methods of analysis namely, simple correlation coefficient, path analysis, full model regression, stepwise multiple linear regression, factor analysis have different mathematical concepts. Highly significant and positive correlation coefficients were detected between sugar yield and each of number of internodes/stalk, number of millable stalks/m 2, total soluble solids % and sucrose %. The results of path analysis revealed that the number of millable stalks/m 2 was the most important character with the highest direct and indirect effects on sugar yield followed by sucrose % and stalk weight. The same three traits were also responsible for the most sugar yield variability using full model regression and stepwise multiple linear regression with goodness of fit. Factor analysis grouped the studied eight traits as sugar yield components into three main factors accounting for 85.3 % of the total variability in the dependence structure. Factor I was responsible for 34.89 of the total variation and included stalk weight, stalk thickness and number of millable stalks/m 2. Factor II contained total soluble solids % and sucrose and contributed at 28.17 % of the total variation. Stalk height, number of internodes/stalk and reducing sugar % were the components of the last factor and explained 22.25 % of the total variation. Based on the previous results, it could be concluded that the high sugar yield of sugarcane crop would be obtained by selecting breeding materials that have heavy weight of stalk, large number of millable stalks/m2 and high percent of sucrose. Source

Abd El-Naby Z.M.,Field Crop Res Institute | Mohamed N.A.,Field Crop Res Institute | Shaban K.A.,Water And Environment Res Institute
Life Science Journal | Year: 2013

Salt stress is a serious environmental problem throughout the world which may be partially relieved by breeding cultivars that can tolerate salt stress. Three alfalfa cultivars, i.e., Ismaelia, New Valley and Siwa, were sown under three levels of salinity (8.73, 10.63 and dSm-1). A field experiment was carried out in sandy clay loam soil at North Sinai Governorate during two successive seasons from mid-spring 2011 to late-Autumn 2012. The results of this study indicated that long growing duration of alfalfa cultivars under different soil salinity levels led a slight decrease in soil pH and soil EC. The available macronutrients (N, P and K) and micronutrient (Fe, Mn and Zn) contents accumulated in soil recorded positive increasing effects, depending on the length of alfalfa cultivation period. Evaluation at the germination stage is absolutely critical in developing cultivars that can establish a good stand. Natural selection through frequent cutting and salinity stress is an excellent means to screen large sets of salt tolerant genotypes and get an idea for regrowth potential under high salinity levels. Siwa cultivar was the highest yielding across all seasons and salinity levels; it also recorded the highest mean of total fresh and dry forage yield (53.06 and 12.60 t fed-1, respectively), while New Valley cultivar recorded the lowest means (40.66 and10.12 t fed-1, respectively) across all salinity levels. Siwa cultivar was superior over Ismaelia and New Valley in most of the agronomical characters under study. The high level of salinity (EC= 15.31dSm-1) depressed the number of tillers plant-1, fresh and dry forage weight (g) plant-1. New developed alfalfa population (Sina-1) was the most tolerant and adaptable to saline soils in Sahl El-Tina conditions. Source

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