Grain yield and water use efficiency of super rice under soil water deficit and alternate wetting and drying irrigation

A field experiment was conducted at the Bangladesh Agricultural University (BAU) to find out possible effects of alternate wetting and drying irrigation (AWDI) on the yield, water use and water use efficiency (WUE) of Boro rice. The experimental layout was furnitured using split-plot design (SPD) with two modern varieties (MV) of rice viz. BRRIdhan 28 and BRRIdhan 29, which received four irrigation treatments randomly and was replicated thrice. The treatments ranged from continuous submergence (T1) of the field to a number of delayed irrigations (T2, T3 and T4) denoting application of 5 cm irrigation water when water level in the perforated PVC pipe fell 10, 20 and 30 cm below ground level (G.L.), respectively. The study revealed that treatment T1 attributed by the highest total water use (122.2 cm) and the lowest WUE (58.53 kg/ha/cm) produced the highest grain yield (6.86 t/ha). Treatment T2, on the contrary, gave the second highest yield (6.58 t/ha) and consequently the second highest WUE (69.48 kg/ha/cm) indicating quite a large water saving (15 cm) compared to treatment T1. The yields in treatments T3 (6.27 t/ha) and T4 (5.86 t/ha) were significantly lower at 1% level of significance compared to that of treatment T1. No significant effect was found either for the treatment or for the varieties on the number of effective and total tillers hill-1 nor did they affect 1000 grain weight. Reduced plant height, no. of effective tillers hill-1, grain yield, straw yield, biological yield and harvest index were found with the increasing water stress. Key words: Alternate wetting and drying irrigation; Boro rice; Yield; Water use efficiency DOI: 10.3329/jbau.v6i2.4841 J. Bangladesh Agril. Univ. 6(2): 409-414, 2008

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EFFECTS OF ALTERNATE WETTING AND DRYING TECHNIQUES ON GRAIN YIELD AND WATER USE EFFICIENCY IN IRRIGATED RICE

Journal of Sustainability Science and Management ◽

10.46754/jssm.2021.02.002 ◽

2021 ◽

Vol 16 (2) ◽

pp. 3-10

Author(s):

BANCHA KWANYUEN ◽

◽

SURASIT PUNYAWANSIRI ◽

KANTASINEE CHAENGPUI

Keyword(s):

Grain Yield ◽

Water Use Efficiency ◽

Water Use ◽

Wetting And Drying ◽

Irrigated Rice ◽

Alternate Wetting And Drying ◽

Drying Techniques ◽

Use Efficiency

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Water Use Efficiency and Physiological Response of Rice Cultivars under Alternate Wetting and Drying Conditions

The Scientific World JOURNAL ◽

10.1100/2012/287907 ◽

2012 ◽

Vol 2012 ◽

pp. 1-10 ◽

Cited By ~ 14

Author(s):

Yunbo Zhang ◽

Qiyuan Tang ◽

Shaobing Peng ◽

Danying Xing ◽

Jianquan Qin ◽

...

Keyword(s):

Water Management ◽

Grain Yield ◽

Water Use Efficiency ◽

Water Use ◽

Field Experiments ◽

Grain Filling ◽

Dry Season ◽

Wetting And Drying ◽

Alternate Wetting And Drying ◽

Use Efficiency

One of the technology options that can help farmers cope with water scarcity at the field level is alternate wetting and drying (AWD). Limited information is available on the varietal responses to nitrogen, AWD, and their interactions. Field experiments were conducted at the International Rice Research Institute (IRRI) farm in 2009 dry season (DS), 2009 wet season (WS), and 2010 DS to determine genotypic responses and water use efficiency of rice under two N rates and two water management treatments. Grain yield was not significantly different between AWD and continuous flooding (CF) across the three seasons. Interactive effects among variety, water management, and N rate were not significant. The high yield was attributed to the significantly higher grain weight, which in turn was due to slower grain filling and high leaf N at the later stage of grain filling of CF. AWD treatments accelerated the grain filling rate, shortened grain filling period, and enhanced whole plant senescence. Under normal dry-season conditions, such as 2010 DS, AWD reduced water input by 24.5% than CF; however, it decreased grain yield by 6.9% due to accelerated leaf senescence. The study indicates that proper water management greatly contributes to grain yield in the late stage of grain filling, and it is critical for safe AWD technology.

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