Abstract: Two field experiments were conducted at the Experimental Farm of Rice Research and Training Center (RRTC), Sakha, Kafr El-Sheikh, Egypt, during 2005 and 2006 summer seasons to study the effect of cut-off irrigation dates on grain yield and quality of some Egyptian rice cultivars for determine the optimum timing of last irrigation to rice field. Such experiments were laid out in a split-plot design, with four replications. The main plots consisted of three rice cultivars, viz. Sakha 101, Sakha 102 and Sakha 104, however, the sub-plots were occupied by four cut-off dates of irrigation, viz. termination of irrigation at complete heading, 7, 14 and 21 days after complete heading. The main results revealed that rice cultivars varied in panicle dry matter (g) and panicle growth rate (g/day/panicle) from heading to harvest time under different cut-off dates of irrigation. Panicle growth rate increased at a very fast rate and reached maximum in earlier stages for Sakha 102 and Sakha 104 than for Sakha 101, thereafter the rate of increase was slow, followed by a slight decrease. Sakha 101 recorded significantly the highest grain yield of 8.99 and 9.79 t/ha in 2005 and 2006 seasons, respectively, accompanied with maximum values of panicles number/m2, panicle length, number of spikelets per panicle, sink capacity, panicle density and panicle grain weight. However, Sakha 102 recorded the highest and significant values of unfilled grain percentage, one thousand grain weight, moisture content in grains, milling recovery (hulling, milling, head rice and broken rice %) and protein content. No significant difference was found between Sakha 102 and Sakha 104 in hulling, milling and head rice percentage. The results, also, showed that delay in withholding of irrigation significantly increased the grain yield and its components (panicle length, no. of grains/panicle, panicle density, panicle grain weight and 1000-grain weight) but, reduced the unfilled grains percentage compared with earlier cut-off dates of irrigation at complete heading. Higher moisture percentage in grains (17.64 and 15.99 %) was recorded when delay last irrigation up to 21 days of heading and resulted in higher head rice recovery (67.36 and 66.91 %) and lower broken rice (5.40 and 6.02 %) in both seasons, respectively, whereas withholding irrigation just after heading reduced moisture content, and increased broken rice recovery. Over both seasons, panicle length, number of spikelets/panicle, sink capacity, panicle grain weight, moisture content and milling recovery (hulling, milling and head rice percentage) showed positive and highly correlation coefficients with grain yield. Also, positive correlation coefficient was found between grain yield with panicle density and protein content. However, unfilled grains and broken rice percentage had negative and highly significant correlation coefficients with grain yield. Generally, withholding of irrigation 21 days after compete heading is considered as the optimum timing of last irrigation to rice field to get high grain yield and quality of rice cultivars under the same conditions of study.
Publication year 2007
Pages 123-139
Availability location معهد بحوث المحاصيل الحقلية- 9شارع الجامعة- الجيزة
Availability number
Organization Name
serial title مجلة البحوث الزراعية – جامعة كفر الشيخ
Author(s) from ARC
Agris Categories Agriculture - General aspects
Grain. Irrigation. Rice.
Publication Type Journal