Crop Performance and Water Productivity of Irrigated Rice under Different Water Management Systems

Uttam Kumer Sarker¹, Romij Uddin¹, Abdur Rahman Sarkar¹, Abdus Salam¹, Ahmed Khairul Hasan¹ and Sang Un Park²

¹Department of Agronomy, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

²Department of Crop Science, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Korea.

 Corresponding Author E-mail: supark@cnu.ac.kr

DOI : http://dx.doi.org/10.13005/bbra/2424

ABSTRACT:

Increment of rice production to feed the growing population under increasing water scarcity is of great concern for recent days. Moreover, the water is a very limiting input for the crop production and its efficiency is relatively low. Physiological attributes and yield performance of high yielding (HYV) rice cultivars need to be evaluated by minimizing water loss. Therefore, thefield experiment was conducted during November, 2015 to May, 2016 under irrigated conditions in Bangladesh to investigate the impact of cultivars and water management on growth dynamics, yield and water productivity. Five HYV boro (dry season irrigated) rice cultivars viz. BRRI dhan28, BRRI dhan29, BRRI dhan60, Binadhan-8 and Binadhan-10along with four water management systems such as continuous saturation (CS), water application at 8, 10 days after disappearance of ponded water (DAD) and BRRI management irrigation systems(AWD) were included  in the study. This study aimed to determine suitable cultivar and water management system for better production of rice. The study revealed that cultivars Binadhan-10 had highest value of leaf area index (LAI), number of effective tillers hill^-1, and number of grains panicle^-1. Growth and yield were increased with water application up to 8- DAD after which these factors declined with increasing water stress at 10- DAD and AWD. The result also showed that the crop grown at CS condition did not increase the yield, rather caused the wastage of irrigation water. The water productivity was the highest (0.240 t ha^-1cm^-1) in 10- DAD treatment, obviously due to minimum water use but highest yield was observed in 8- DAD because of optimum use of water and non-stress condition. Therefore, the present study was useful for the selection of the most efficient cultivar, which could be strongly recommended to rice growers to improve crop yield and reduce the use of water.

KEYWORDS: growth stage; HYV rice; subtropical environment; water stress; water productivity

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