to find out the response of faba bean (improved Giza 3 cv.) to three planting densities (80000, 100000 and 120000 plants/fad.), three humic acid rates (zero, 2 and 4 kg humic acid/fad.) and four phosphorus levels (zero, 15.5, 31 and 46.5 kg P 2 O 5 /fad.). The results of the combined analysis revealed that increasing planting density significantly decreased number of pods and branches/plant, and seed weight/plant as well as protein yield/fad., while, plant height and biological yield/fad., were significantly increased by increasing plant densities up to 120000 plants/fad. The highest value of seed yield/fad., was obtained by planting faba bean on density 100000 plants/fad. Results of the combined analysis also showed that, increasing humic acid rates up to 4 kg/fad., significantly increased number of pods/plant, weight of seeds/plant and protein yield/fad., but, hundred seed weight, plant height and number of branches/plant were not affected by the application of humic acid. Meanwhile, biological and seed yields/fad., were responded to the application of humic acid rate up to 2 kg/fad. In general, application of phosphorus fertilizer up to 46.5 kg P 2 O 5 /fad., significantly increased all traits under study such as number of branches and pods/plant, weight of seeds/plant, seed and biological yields/fad., and protein yield/fad as compared to other rates (combined data), while, hundred seed weight significantly increased by increasing P levels up to 31 kg P 2 O 5 /fad. Interaction results showed that, faba bean plants received 31 kg P 2 O 5 /fad., and 2 kg humic acid/fad., or received 2 kg humic acid under medium density (100000 plants/fad.) produced the highest value of seed yield/fad.

Two field experiments were carried out at the experimental farm (Ghazala Village), Faculty of Agriculture, Zagazig University, Sharkia Governorate, during 2016/2017 and 2017/2018 seasons to study the influence of three planting densities, (28000, 35000 and 46666 plants/fad.) three levels of N fertilizer (80,100 and 120 kg/fad.) and two levels of potassium fertilizer (24 and 48 kg k 2 O/fad.) on yield and its attributes as well as quality of sugar beet grown in clay soil. Results of combined analysis illustrated that, decreasing planting density from 46666 to 35000 or 28000 plants/ fad., significantly increased root length, root diameter and fresh root weight g/plant; on the other hand the highest planting density (46666 plants/fad.) produced higher sucrose, extractable sugar percentages, sugar and recoverable sugar yields/fad., than low or medium densities. Raising N fertilizer levels significantly affected yield and its attributes as well as quality of sugar beet. Where, the results of the combined analysis indicated that, each increment of nitrogen fertilizer level from 80 up to 120 kg N/fad., cm was accompanied with a significant increase in root length, root diameter, fresh root weight/plant, root and recoverable sugar yields/fad., but significantly decreased sucrose (%). Data of combined analysis also revealed that application of 48 kg K 2 O/fad., significantly increased root yield attributes i.e., root length root diameter (cm), fresh root weight g/plant, sucrose, extractable sugar percentages, as well as, root and recoverable sugar yields ton/fad., compared with supply of 24 kg K 2 O/fad. Interactions between the studied factors (according to the combined analysis) indicated that the highest root yield (ton/fad.) was achieved when sugar beet was sown with the highest plant density of 46666 plants/fad., and fertilized with 120 kg N/fad. As well as, the highest value of root diameter (cm) was achieved under the application of 120 kg N/fad., and addition of 48 kg K 2 O/fad., while, the interaction between planting densities and potassium fertilizer levels had no significant effects on all studied traits.

growing seasons, to study the effect of three sowing dates (November 10P th P , November 30P th P and December 20P th P ), three nitrogen fertilizer levels (60, 90 and 120 kg N/fad.) and four wheat cultivars (Gemmizea 11, Sids 12, Giza 164 and Misr 1) on yield and yield attributes of wheat under sandy soil conditions. Each experiment included 36 treatments, which were the combinations of three sowing dates, three nitrogen fertilizer levels and four wheat cultivars. A split-split plot design with three replicates was used where; the main plots were devoted to sowing dates while the sub plots were occupied by nitrogen fertilizer levels whereas wheat cultivars were allotted in the sub-sub plots. The obtained results revealed that plant height, number of spikes /mP 2 P , spike length, number of spikelets/spike, number of grains/spike, 1000-grain weight as well as grain, straw and biological yields/fad., were significantly higher on November,30P th P sowing as compared to other sowing dates. Nitrogen fertilizer level affected significantly all studied traits. Since, increasing nitrogen fertilizer level up to 120 kg N/fad., significantly increased plant height, spike length, number of spikelets/spike, number of grains/ spike as well as grain, straw and biological yields/fad., while 1000-grain weight significantly decreased. On the other side, number of spikes /mP 2 P was responded only to nitrogen up to 90 kg N/fad. (Combined data). Misr 1 cv. recorded the maximum plant height, number of spikes/mP 2 P as well as grain, straw and biological yields/fad., but without significant differences than Gemmizea 11 in grain and biological yields. Otherwise Sids 12 surpassed other cultivars in spike length, number of spikelets/spike, number of grains/spike and 1000-grain weight.