The Effect of Seeding Rates and The Weed of Herbicides In Crop Growth Rates and Relative Growth and Net Assimilation of Rice Crop In Different Durations | ||
| Euphrates Journal of Agriculture Science | ||
| Article 1, Volume 6, Issue 4, December 2014, Pages 130-147 | ||
| Abstract | ||
| ABSTRACT : A field trial was carried out at Mishkab Rice Research Station, Al-Najaf Al-ashraff governorate during the summer seasons of 2008 and 2009 to investigate the effects of seeding rates (120,140,160 and 180 kg.ha-1) and herbicides (control, oxadiazon, propanil and weed-free) on crop growth rate,relative growth rate and net assmilation rate of Yasamin rice cultivar. The design used was split plot RCBD with arrangement with four replicates. The results indicated that the seeding rate 180 kg . ha-1 was superior in giving the highest values of crop growth rate in most of durations growth especially significant in duration 100-115 day of sowing when it gave 20.64 and 21.27g.m-2.day-1 for two season respectively, comparied to the seeding rate120kg.ha-1 when it the lowest rate of the characteristic value 18.93 and 18.87 g.m-2.day-1 for two season respectively while the seeding rate gave 120kg.ha-1 in first season and 140kg.ha-1 in second season which higher relative growth rate in the duration of 100-115 days from sowing when it gave 0.0057 and 0.0038 g.g-1.day-1 for two season respectively, compared to seeding rate of 180kg.ha-1 when it gave the lowest average of characteristic of 0.0052 and 0.0036 g.g-1.day-1 for two season respectively, the seeding rate 120kg.ha-1 by given the highest net assimilation rate values of 0.372 and 0.424 g.m-2(leaves).day-1 compared with seeding rate 180 kg.ha-1 Which gave the lowest average of value 0.323 and 0.400 g.m-2(leaves).day-1 the season respectively. Out weigh weed free significant by Given highest average of crop growth rate, higher relative growth and net assimilation rate value 21.46 and 23.46 g.m-2.day-1 , 0.0058 and 0.0044 g.g-1.day-1 and 0.360 and 0.417 g.m-2(leaves).day-1 compared with weedy which gave the lowest average of characteristics value 16.32 and 14.64 g.m-2.day-1, 0.0052 and 0.0034 g.g-1.day-1 and 0.299 and 0.298 g.m-2(leaves).day-1 for two season respectively, superior oxadiazon as compared with propanil in gaven high average in most studies characteristics when duration 100-115 days from sowing In addition to superiority of two herbicides onto weedy treatment in most duration of growth for all studies characteristics. | ||
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