Response of Some Cultivars of Oat (Avena Sativa L.) To Sowing Dates and Nitrogen Fertilizer Rates on Its Growth and Yield Component's
Abstract
A field experiment was carried out at Experimental Farm of Faculty of Technology and Development, Zagazig University at Ghazalah Village, Zagazig District, Sharkia Governorate, Egypt during the two successive growing winter seasons of 2022/2023 and 2023/2024 to investigate the effect of three sowing dates, i.e. 30st October, 15th November and 30th November and four nitrogen fertilizer rates, i.e. without application, 30, 60 and 90 Kg. N/fed. on growth, yield and its attributes for two varieties of Oats, i.e. White Oat and Red Oat under middle Delta conditions in Sharkia Governorate. Results indicated that sowing date at 15th November produced a tallest plant height (cm), greatest no. of green leaves/plant, largest flag leaf area (cm2), greatest no. of total tillers/plant, no. of productive tillers/ plant, no. of days to (50% heading), greatest no. of panicle /m2, tallest panicle length (cm), greatest no. of spikelets/panicle, greatest no, of grains /panicle (g.), heaviest weight of grains/ panicle, heaviest 1000-grain weight(g.), greatest grain, straw and biological yield (ton/fed.) and harvest index %, followed by sowing date at 30st October. On the other hand, the sowing date of 30 November gave the lowest values in this concern. Moreover, the obtained results indicated that the two varieties significantly differed in all studied traits in the two growing seasons. White Oat variety superior Red Oat variety and gave the highest values in the all studied traits. Results also showed that significantly increased in all studied traits with increasing the application of nitrogen fertilizer rates from 0 up to 90 Kg. N/fed.