PERFORMANCE OF PROMISING HYBRID RICE GENOTYPES UNDER DIFFERENT IRRIGATION INTERVALS | ||
| Menoufia Journal of Plant Production | ||
| Article 1, Volume 6, Issue 1, January 2021, Pages 19-33 PDF (433.58 K) | ||
| Document Type: original papers | ||
| DOI: 10.21608/mjppf.2021.169077 | ||
| Authors | ||
| E. E. Gewaily; H. Sh. Hamad; B. B. Mikhael; E. F. Arafat | ||
| Rice Research Department, Field Crops Research Institute, Agricultural Research Center, Egypt. | ||
| Abstract | ||
| Water shortage stress is the most critical abiotic factor reducing rice yield . Water deficit stress at whichever of the rice critical growth stage causes decline in yield. A field e xperiment was conducted at the Experimental Farm of Sakha Agricultural Research Station, Kafr elsheikh, Egypt during 2018 and 2019 seasons, to investigate the effect of four irrigation intervals (continuous flooding(I1), irrigation every six days(I2), nine days(I3) and twelve days(I4)) on performance of five genotypes (Giza 178, IR 69625A/Giza 178, IR 70368A/Giza 178, IR 69625A/Giza 179 and IR 69625A/Giza 181). Strip < /div> plot design, with four replications was used. The horizontal plots were assigned to irrigati on treatments, while the vertical plots were assigned to rice genotypes. Different drought tolerance indices such as abiotic tolerance index (ATI), stress susceptibility index (SSI), mean productivity (MP), tolerance index (TOL) and stress susceptibility percentage index (SSPI) were tested in screening superior rice genotype s. The results showed that days to 50% heading, plant height, panicle length, panicle weight, number of effective tillers hill -1 , spikelet's number panicle -1 , number of branches panicle -1 , seed set (%), 1000- grain weight (g), number of filled grain s panical -1 , grain yield t ha -1 , harvest index (%) and biomass weight t ha -1 were highly significantly affected by the interaction between irrigation intervals and genotypes. The highest values of grain yield were obtained by IR69625A/Giza 181 under continuous flooding irrigation during both seasons . Based on results of different drought tolerance indices, IR69625A/Giza 181 showed lowest values of ATI, SSI and TOL and the highest values of MP and SSPI and was identified as drought tolerant genotype . | ||
| Keywords | ||
| Rice genotypes; i rrigation intervals; drought tolerance indices and grain yield | ||
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