Two field experiments were conducted at the Farm of Sakha Agricultural Research Station, Sakha,Kafr-ELsheikh, Egypt during 2012 and 2013 summer seasons. The study aimed to find out the proper nitrogen levels of drill seeded rice of Giza179 rice cultivar under prolonged irrigation interval. The experiment was performed in strip-plot design with four replications. The horizontal plots were devoted to three irrigation treatments; continuous flooding (CF) every 3 days, irrigation every 6 and 9 days. The nitrogen levels Viz; 0, 110, 165 and 220 kg Nha
Two filed experiments were conducted during 2012 and 2013 seasons at the Experimental Farm of Rice Research and TraIning Center, Sakha, KafrEl-Sheikh, Egypt. The experiment aimed to study the effect of irrigation intervals and potassium splitting on Egyptian hybrid one (EHR1) rice cultivar. The study was performed in strip plot design with four replications. The irrigation intervals; irrigation every 3, 6 and 9 days were placed in the horizontal plots, while the potassium splitting treatments, namely; K1: All basal (B), K2: ½ B + ½ mid tillering (MT), K3: ⅓ B + ⅓ MT + ⅓ panicle initiation (PI) and K4: ¼ B + ¼ MT + ¼ PI + ¼ booting stage (BT) were distributed in the vertical plots. Some growth characteristics, chlorophyll content, leaf area index and dry matter production m -2 were assessed at heading stage. Yield and yield attributes were measured at harvest .Some water relations were also estimated during current study.The resulted indicated that irrigation intervals had significant effect on all studied traits in both seasons of study. The prolonging irrigation intervals up to 9 days significantly reduced rice growth, yield attributing characteristics, rice grain and straw yields as well as harvest index. The irrigation intervals every 3 and 6 days were placed at the same level of significant in both seasons of study regarding the rice growth, yield contributes, grain yield and harvest index. The irrigation interval every 3days treatment consumed the highest amount of total applied water (13492.9 and 13609.8m/3 ha -1 ) with the lowest values of water use efficiency (0.811 and 0.814 kg/m3 ) during first and second seasons, respectively. The irrigation interval of 9 days gave the highest values of yield reduction (18.01 and 19.22%), water save (20.23 and 21.50 %) and medium value of water use efficiency (0.833 and 0.838 kgm -3 ) in 2012 and 2013 seasons, respectively. The irrigation interval of 6 days had the highest values of water use efficiency (0.894 and 0.899 kgm -3 ) with mild yield reduction of (1.65 and 1.81%) and its water save was amounted to be 10.76 and 11.03% in the first and second seasons, respectively.The potassium split treatments significantly improved rice growth, yield contributes, rice grain and straw yields as well as harvest index comparing to one dose application as basal. The potassium splitting into four equal doses, ¼ B + ¼ MT + ¼ PI + ¼ BT significantly surpassed the rest of treatments whereas; it gave the highest values of all measured traits, while potassium application as one dose gave the lowest values of all measured traits under current study in both seasons. The potassium split into four equal doses gave the highest values of water use efficiency (0.897 and 0.905kgm-3 ) in both seasons of study. Generally, both of potassium splitting into three equal doses, ⅓ B + ⅓ MT + ⅓ panicle initiation (PI) and potassium splits into equal four doses were placed in the same group regarding superiority effect on dry matter gm -2 , number of paniclesm -2 , total number of grainspanicle -1 , nu...
Field experiments were conducted at El-Gemmaza Station Farm, during 2012 and 2013 seasons to study the response of rice crop to phosphorous and sulfur fertilizations. Sakha 105 rice cultivar was used. The experiments were laid out in split plot design with four replications; the net plot size was 10 m 2. The main plots were designated for phosphorus treatments and the sub-plots for sulfur treatments. The phosphorus treatments were 0, 18, 37, 55 kg P2O5 ha-1 denote P0, P18, P37 and P55, while, the sulfur treatments were 0, 47, 95 and 142 kg S ha-1 denote, S0, S47, S95 and S142. The main results could be summarized as follows, phosphorous application as signal significantly and positively affected rice grain yield in both seasons of study. At the same time significant improving in grain yield were detected as a results of significant improvement in yield attributes by phosphorous application. The optimum rate of P was 37 kgP2O5 ha-1 at the first season and 55 kg P2O5 ha-1 in the second season. Sulfur application significantly improved growth, yield and yield attributing traits in both seasons of study. Yield and yield attributes significantly responded to sulfur fertilizer up to 95 kg S ha-1 in both season and increasing sulfur rate beyond this rate slightly decreased the yield and yield components. Regarding the interaction effect, the interaction between sulfur and phosphorous had significant effect on dry matter (gm-2), number of tillers hill-1 , Number of panicles hill-1 , number of filled grains panicle-1 and grain yield tha-1 in both seasons. the optimum combination of phosphorus and sulfur was P37S95. The interaction effect on rice grain yield, in the first season, grain yield recorded its maximum value at the combination of P37S95 in the first season. It is noted that P35S95 combination occupied the second order after P55S95 without significant differences in the second season. The combination of P37S95 could be recommended under such conditions for optimum rice grain yield .
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