NULL

NULL

NULL

NULL

NULL

NULL

NULL

A field experiment was carried out at the Experimental Farm Station of Soils and Water Department, Faculty of Agricultural, Assiut University, during 2013/2014 growth season to investigate the effect of application of phosphorus (P) and sulphur (S) on yield, and the uptake of phosphorus and some micronutri-ents by wheat plants. The treatments comprised of three P levels (0, 30, 60 kg P2O5 fed-1) and three S levels (0, 100, 200 kg S fed-1) in different combinations. Applications of P at 30 and 60 kg P2O5 fed-1 showed significant increases in the main straw yield of wheat of 4.45 to 10.50%, respectively, over the control. Also, S addition at 100 and 200 kg S fed-1 resulted in a significant increase in the main wheat straw yield of 1.51 and 3.11 % over the control, respectively. Moreover, a respective significant increase in the main grain yield of 3.58 to 9.56 % was ob-served due to application of the two P levels, but both applied S levels caused a respective significant increase in the main grain yield of 1.50 to 3.08 % over the control. The application effect of both P and S was synergistic at all applied lev-els. Applying P at levels of 30 and 60 kg P2O5 fed-1 produced an increase in the main P uptake of 23.19 and 54.23 % by wheat straw, respectively, and 11.89 and 28.83% by wheat grains, respectively, over the control. Also, S applications caused similar effect on the main P uptake by both straw and grains. Moreover, the highest applied P level caused increases in main Fe, Zn, Mn and Cu uptakes of 43.32, 48.65, 36.37 and 69.75 %, respectively, by the straw, respectively, and increases in main Zn, Mn and Cu uptakes of 36.37, 16.92 and 75.02%, respec-tively, by the grains over the control, and decreases in the Fe uptake of 1.63% by grain . In addition, the highest S applied level resulted in increases in the main uptake of Fe, Zn, Mn and Cu of 21.29, 22.52, 53.32 and 58.83%, respectively, by the straw and 15.04, 16.12, 26.18 and 28.16%, respectively, by the grains over the control.

Two field experiments were conducted at East of El-Ewinate Agricultural Research Station, New Valley, Egypt during 2013 and 2014 seasons to investi-gate the response of two peanut varieties to the foliar application of some micro-nutrients (Fe, Zn and Mn) and sulphur addition. A randomized complete block design (RCBD) using a split- split-plot arrangement with three replications was used. Seven combinations of Fe, Zn and Mn were randomly allocated in the main plots. Two elemental sulphur levels (200 and 400 kg fed.-1) were randomly as-signed in the sub-plots, as well as two peanut varieties (Giza-6 and Sohag-110) were arranged in the sub-sub-plots. The obtained results showed that, the peanut varieties varied significantly in most studied traits except the shelling percentage in both seasons. Sohag-110 va-riety surpassed Giza-6 in the most studied traits of peanut crop. The foliar appli-cation of micronutrient treatments had a significant influence on all studied traits of peanut crop in both growing seasons. Also, the interaction of varieties and the micronutrients foliar application showed a significant impact on some studied traits compared to the control. The yield and its attributes were significantly af-fected when sulphur and micronutrient treatments were applied. The highest mean values of most studied traits were obtained by applying 400 kg fed.-1 of sulphur with adding Fe +Zn + Mn treatment as a foliar spray. Moreover, the highest mean values of yield and its attributes as well as oil yield were obtained by adding 400 Kg fed.-1 of sulphur and spraying Sohag-110 variety of peanut crop with Fe + Zn + Mn treatment.

A field experiment was conducted at the Experimental Farm, El-Mattana, Agriculture Research Station, Luxor, Egypt during spring season of 2013 to determine the effects of water stress on sugarcane yield and its quality as well as its response to potassium application. The experiment was laid out in split-split plots design with three replicates. The main plots were used to express irrigation regimes (0.8, 1 and 1.2 of the cumulative pan evaporation, CPE). The split units were assigned for irrigation manners (all furrows and alternative furrows). Sub split plots were occupied by K levels (25, 50 and 75 Kg K2O/ fed). All the experimental treatments were randomly distributed on the respective plots. The actual evapotranspiration (ETa) values under alternative furrow irrigation treatments (5215 m3) were less than that under all irrigated furrow treatments (5764 m3) regardless to the effect of irrigation regime or potassium fertilization. The amounts of applied water were 3592.50, 4979.39 and 8134.33 m3/ fed for irrigation regime (CPE) of 0.8, 1 and 1.2, respectively. Irrigation efficiency (IE) was decreased as the percentage of soil moisture depletion increased (at 0.8 CPE). Normal irrigation with 1.2 CPE at 75 Kg K2O/ fed achieved the highest value of IE (86.16%) while the lowest value (57.52%) was recorded at normal irrigation with 0.8 CPE and 50 Kg K2O/ fed. The best treatment was alternative irrigated furrow at 1 CPE when fertilized by 75 Kg K2O / fed since it realized the highest CWUE (8.86 Kg cane /m3 and 1.1 Kg sugar/m3). Cane yield as well as juice purity and sugar concentration declined, resulting in decreased sugar yield as irrigation intervals was increased. Also, cane yield and its quality was increased by increasing potassium fertilization level.