الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 109 |  |  |
| | | from | 109 | | |
Abstract
The present investigation was planned to determine the effect of mulching materials, deficit irrigation and mulch layer thickness on common bean yield, its components, water use efficiency, yield response factor and soil salinity under drip irrigation system. Two field experiments were conducted during the two growing seasons (2014 and 2015) at the private farm; Ansar Alkharigin village Ihnasiya Sdment El-Gabal Center, Beni Suef Government, Egypt. Twenty-four treatments comprising of two mulching materials (Rice straw mulch (RSM) and Farmyard manure mulch (FYM)), three irrigation treatments (I100% =100%, I85% =85% and I70% = 70% of crop evapotranspiration (ETc) and four mulch layer thicknesses (MLT0, 3, 6 and 9 cm) were studied each season under drip irrigation system. The results showed that the effects of mulching materials, irrigation treatments and mulch layer thickness on yield and WUE were significant. The average bean yield values of FYM treatment were increased by 8.78 % and 7.64 % than that for RSM treatment in two seasons, respectively. The highest dry seed yield of bean (948.8 and 941.5 kg fed-1) was obtained with the no-deficit treatment (I100%). The lowest yield (723.0 and 720.3 kg fed-1) was obtained with treatment (I70%) in the first and second season, respectively. The average bean yield value of MLT9 was increased by 8.81, 23.87 and 43.71 % than those of MLT6, 3 and 0, respectively, in the first season. Corresponding values in the second season were 10.53, 26.68 and 47.89 %. The lowest value of soil salinity was obtained under (I100%), while the greatest one was obtained from (I70%). The average soil salinity value of (I70%) was increased by 28.26 and 13.50 % than those of I100% and I85%, respectively. The highest soil salinity value was observed under MLT0 (no mulch) compared to another treatment. The average EC value of
ii
The highest WUE (0.77 kg m−3) value was recorded under FYM compared to (0.71 kg m−3) under RSM. The highest WUE (0.76 and 0.76 kg m−3) value was obtained under I70% compared to (0.70 and 0.69 kg m−3) under I100%, in two seasons, respectively. The average WUE values of MLT9 were increased by 46.54, 26.65 and 9.89 % than those of MLT0, MLT3 and MLT6 respectively. The reductions in relative yield value was increased with increasing reduction in irrigation water applied, under all treatments, yield response factor (Ky) values for I70% were always higher than those of I85% and I100%. The Ky usually indicates a linear relationship of the relative reduction in water that was consumed with a relative reduction in yield. The average crop response factor for different treatments throughout the bean growth was 0.77 and 0.73 for 2014 and 2015 seasons, respectively It could be considered as a suitable under environmental conditions of study area, the treatment (I100 × FYM× MLT9) proved to be the most suitable for producing high dry seeds of bean crop. Under limited irrigation water, application of (I85 ×FYM×MLT9) treatment was found to be favorable to save 15% of the applied irrigation water with on reduction in bean crop yield.