Title: Reaction of the salt-tolerant rice lines and local cultivars irrigated with sugarcane drainage water in dry bed-seeding
Author: Abdolali Gilani
Abstract: This study was carried out in one year to determine the interaction between rice lines and irrigation management in the condition of using sugarcane drainage water. The L08-20 farm of Mirza Khoochak-khan Agro-Industry Company was used in the south of Khuzestan province, about 75 km from Ahvaz. In summer and autumn 2019, seven salt-tolerant lines of rice were cultivated based on a completely random block design using the dry-bed seeded method with periodic irrigation management with three replacements. Three irrigation management were used included full irrigation with sugarcane drainage water (I1), irrigation with Karun river water by the end of the seedling stage or 4-5 leaves and the onset of the first symptoms of tillering, then irrigation with sugarcane drainage water until the end of cultivation (I2) and full irrigation with Karun river water (I3). Rice lines including three salt-tolerant from the 30th) IRSSTN-2012 (International rice soil stress tolerance nursery, S1, S2, S4 and SH-12 from Rice Research Institute of Iran and three local cultivars Champa, Anbori-Ghermez and Hoveyzeh. The results showed that the total applied water of three irrigation management was 31020 m3/ha and the share of sugarcane drainage water from the (I2) was 12200 m3/ha. Soil monitoring of farms showed that using drainage water can move the soil toward sodic soil, especially during the rice-growing season. It can be concluded that using drainage water with sufficient leaching requirement during growing season and end of season leaching with proper water quality (especially in low rainfall years) will greatly reduce soil quality. Averaged water productivity of rice varieties and lines for I2 and I3 irrigation management were 0.046 and 0.081 Kg/m3. According to the obtained results, Anbori-Ghermez and S2 with a reduction of 39% and 49% had the lowest and highest water productivity loss, respectively, because of using an integrated irrigation regime relative to irrigation with Karun river water. These two varieties had 3247 and 1782 Kg/ha in the condition of using Karun river water, respectively. For the integrated irrigation regime (Karun river and drainage water) these numbers were 1991 and 910 Kg/ha, respectively. The averaged yield of Champa, Anbori-Ghermez, Hoveyzeh, S1, S2 were 2508 and 1420 Kg/ha for I3 and I2 irrigation treatment, respectively.
Keywords: Direct dry-seeded farming method, Intermittent irrigation, Productivity, Salt-tolerant rice, Sugercane drainage Water, Yield.