The present study was conducted at district Kom Ombo sugar cane farms, (latitude of 24 o 28 o N and longitude of 32 o 57 o E), Aswan Governorate, in the two seasons of 2015/2016 and 2016/2017 including plant cane and 1 st ratoon crops, respectively. To study the effect of harvesting age and phosphorus fertilization levels on yield and quality of some sugar cane varieties. Field experiment included twenty-seven treatments represented the combinations among three harvesting ages (10, 11 and 12 months) three phosphorus fertilization levels [30, 45 and 60 kg P 2 O 5 /fad.] and three sugar cane varieties [G.T. 54-9, G.2003-47 and G.2004-27]. Randomized complete block design with three replications laind aut in split-split plots arrangement.The results showed that all of the studied traits were significantly influenced by the harvesting ages. The three sugar cane varieties significantly differed in all studied traits. The new commercial sugar cane variety G.2003-47 showed superiority over the other varieties in brix sucrose purity cane and sugar recovery percentages. Increasing phosphorus level from 30 up to 60 kg P 2 O 5 /fad. increased significantly brix, sucrose, purity and sugar recovery percentages, while cane and sugar yield tons/fad., in plant cane crop, only.Our data suggest that farmers should attempt to harvest the majority of their crop at age of 12 months. With fertilization by 60 kg P 2 O 5 /fad. to maximize yield.

A field experiment was carried out during 2016/ 2017 and 2017/ 2018 seasons at the Agronomy Department Experimental Farm, Agriculture Faculty, Assiut University to study the effect of foliar spray time by different zinc oxide nanoparticles sizes on productivity and quality of some bread wheat cultivars. The experiment was laid out in randomized complete block design (RCBD) using split plot in strips arrangement with three replications. Zinc dioxide nanoparticles size (control, 20.7, 23.0 and 27.0 nm) were allocated horizontally, while, the three bread wheat cultivars (Sids-1, Sids-12 and Gemmeaza-11) were arranged vertically and zinc spray time (30, 45 and 60 days after planting) were assigned in sub plots. The obtained results show that the zinc oxide nanoparticles sizes (ZnO NPs), bread wheat cultivars and zinc spray time variables had a significant influence on all studied traits in the two growing seasons except the effect of zinc application time on number of spikes m -2 and grain yield feddan -1 traits in the first season which was non-significant. In addition, the most first order interactions had a significant effect on most studied traits in both seasons. Furthermore, the second order interaction had a significant effect on all studied traits in both seasons. The highest mean values of grain yield feddan -1 (28.67 and 28.50 ardab feddan -1 in the first and second seasons, respectively) were obtained from planting Gemmeza-11 cultivar and sprayed it by minimum size (20.7 nm) of ZnO NPs after 60 days from planting. Moreover, sowing Sids-12 cultivar and sprayed it by minimum ZnO NPs size (20.7 nm) at 30 days after planting recorded the maximum mean value of grains dry gluten content (13.72 %) in the first seasons, while, the highest mean value of grains dry gluten content (14.37 %) in the second seasons was achieved from planting Sids-1 cultivar and sprayed it by minimum ZnO NPs size (20.7 nm) at 60 days after planting.

Two cycles of pedigree selection for earliness index were achieved in two segregating populations of Egyptian cotton (G. barbadense L.) under late planting condition. The genetic materials were the F 2 , F 3 , F 4 and F 5generations of the crosses Giza 90/Giza 85 (pop. I), and Gi-za85/Giza70(pop.II).The phenotypic coefficient of variation (CV) of earliness index was large in the F 2 -generation and accounted for 18.19 and 34.75% in pop. I and in pop. II; respectively. However, the CV% of the respective parents were very low reflecting their purity. Broad sense heritability of earliness index was very high (0.99 and 0.98) and unreliable in the F 2generations, which resulted in high expected genetic advance of 32.49 and 61.A44% from the mean for pop. I and pop. II; respectively. After two cycles of selection the retained genetic coefficient of variability was sufficient for further cycles of selection, and was 16.20 and 11.32% for pop. I and pop. II; respectively, with very large estimates of broad sense heritability.However, the realized

The current work was carried out at Agronomy Department Farm, Faculty of Agriculture, Assiut University, Egypt, to study the direct and indirect effects and stepwise regression of yield attributes on forage and seed yields of ten alfalfa genotypes. Two experiments were carried out as experiment I (2017-2019) and experiment II (2018II ( -2020. The experiments were laid out in a split block design with three replications. Five sowing dates at 10 th October (D1), 10 th November (D2), 10 th December (D3), 20 th March (D4) and 20 th April (D5) were used. Fifteen cuts were taken from each sowing date in two years, while, seed yield was taken in the second year which take in the first week of March, April and May for the studied sowing date. The obtained results of path analysis, show that, fresh forage yield has the greatest influence on protein forage yield in each sowing date. However, its indirect effects were negative via mean dry matter percentage or negligible via protein percentage in both experiments. Also, the number of pods/plant and number of seeds/pod contributed to most direct effect on seed yield/plant for each sowing dates. Meantime, the results of stepwise regression analysis showed that, the model no.2 which included two independent traits i.e. dry forage yield and protein percentage resembled the fit model for protein yield. Also, the model no.2 which possessed two independent traits i.e. number of seeds/plant and 1000-seed weight has strong contribution to seed yield/plant.