Effect of supplemental irrigation to alleviate the adverse impact of terminal drought stress on aman rice

Masuma Akhter Era, Md Abu Hasan*, Abu Khaer Md Muktadirul Bari Chowdhury, Md Rabiul Islam and Subrota Kumer Pramanik

Deapertment of Crop Physiology and Ecology, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh,

 *Corresponding author: mdabuhasan@hstu.ac.bd

Article history: Received: 06.04.2021, Accepted: 28.04.2021, Published: Online: 30.04.2021

To cite this article: Era MA, Hasan MA, Chowdhury AKMMB, Islam MR and Pramanik SK. 2021. Effect of supplemental irrigation to alleviate the adverse impact of terminal drought stress on aman rice. Intl. J. Agric. Med. Plants. 2(2): 8-15.


An experiment was conducted at Crop Physiology and Ecology Research Field of Hajee Mohammad Danesh Science and Technology University (HSTU), Dinajpur during August to December 2019 to find out effect of supplemental irrigation on growth and yield of T. aman rice and to assess requirement supplemental irrigation for sustainable rice production in aman season. Rice variety Binashail was used as planting material. The experiment was conducted following Randomized Complete Block Design with four treatments and four replications. The treatments were: i) Rainfed condition (I0), ii) One supplemental irrigation at 45 days after transplanting (I1), iii) Two supplemental irrigation at 45 and 60 days after transplanting (I2) and iv) Three supplemental irrigation at 45, 60 and 75 days after transplanting (I3). The total number of unit plots was 16 and the size of the unit plot was 2 m×2 m. The distance between plots was 1 m and block to block distance was 1.5 m. Rice variety Binashail was used as planting material. The impact of supplemental irrigation on plant height, tillers hill-1 , leaves hill-1 , panicle length, spikelets panicle-1 , unfilled spikelets panicle-1 and above ground biomass of T. aman was found insignificant but the SPAD value which indicates the greenness of leaf was significantly increased due to supplemental irrigation. Supplemental irrigation in aman rice causes significant increase in grain yield compared to rainfed condition. The increment in grain yield was 22.82% for one supplemental irrigation, 23.30% for two supplemental irrigation and 31.55% for three supplemental irrigation. The increase in grain yield in supplemental irrigation plots was contributed by the increment in grains panicle-1 , grain size and grain weight hill-1 . The results of the present study indicate that one supplemental irrigation in T. aman is enough for sustaining yield.

Keywords: Alleviation, drought stress, supplemental irrigation and T. aman


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