الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 16 |  |  |
| | | from | 16 | | |
Abstract
Two filed experiments were carried out at the Experimental Farm of Rice Research and Training Center (RRTC), Sakha Kafr El-sheikh, Egypt during 2011 and 2012 seasons. This study aimed to investigate the response of Sakha 106 rice variety plant spacing, organic (compost) and mineral fertilization under different irrigation treatments. A split-split plot design, with three Plant replications, was used. The main plots were devoted to three irrigation intervals namely; Continuous Flooding (CF), irrigation every six days (6D), and every twelve days (12D) from transplanting up to heading, then CF up to harvest. The sub-plots were assigned to three plant spacing as following 20 x 20, 15 x 20, and 10 x 20cm among rows and hills. However, the sub-sub plots consisted of six fertilizer treatments namely; control (T1), 5 t/ha compost (T2), recommended N (165 kg N/ha) (T3), 55 Kg N/ha + 5 t/ha compost (T4), 110 Kg N/ ha + 5 t/ha compost (T5), and 165Kg N/ ha +5 t/ha compost (T6). The main results revealed that the growth characteristics (Leaf area index, dry matter, days to 50%heading, and plant height) and grain yield and its attributes (number of panicles/m2, number of filled grains/panicle, panicle weight, and 1000 grain weight) were significantly increased under CF and 6D as compared 12D treatment. The closer plant spacing of 10x20cm was closely followed by 15x20cm and registered significantly more growth characteristics and grain yield than of wider plant spacing (20x20cm). Leaf area index, dry matter, and plant height, and grain yield and its components were significantly enhanced by the application of 165 kg N/ha along with 5 t/ha compost (T6), which was at per with T3 and T5. Continuous Flooding consumed the highest amount of irrigation water while, the lowest amount was received by irrigation every 12 days. Irrigation every 6 days gave a similar grain yield to that of CF with less amount of irrigation water and gave reasonable water productivity in both seasons. Generally, irrigation interval of 6 days, narrow spacing of 15 x 20cm and 110 kgN/ha + 5 t/ha compost could be recommended for Sakha 106 rice variety. The previous combination application will ensure high rice and water productivity as well as water saving and safe environment because of less chemical application.
Key words: Rice, Irrigation intervals, plant spacing, rice straw compost and nitrogen fertilizer.