Effect of Alternate Wetting and Drying (AWD) Irrigation for Boro Rice Cultivation in Bangladesh

Abstract

Abstract:A field experiment was conducted at the Bangladesh Rice Research Institute 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 plots were laid out with 2 factors RCBD combining two modern varieties of rice viz., BRRI dhan29 and BRRI hybrid2, which received four irrigation treatments randomly and was replicated thrice. The treatments ranged from continuous submergence (T 1 ) of the field to a number of delayed irrigations (T 2 , T 3 and T 4 ) denoting application of 5cm irrigation water when water level in the perforated PVC pipe fell 15, 20 and 25cm below ground level (G.L.), respectively. The study revealed that treatment T 1 attributed by the highest total water use (122.2cm) and the lowest WUE (84.34kg/ha/cm) produced the lowest grain yield (4.71t/ha). Treatment T 2 , on the contrary, gave the highest yield (5.69 t/ha) and consequently the second highest WUE (85.55 kg/ha/cm) indicating quite a large water saving (15cm) compared to treatment T 1 . The yields in treatments T 3 (5.45 t/ha) and T 4 (5.27 t/ha) were significantly lower at 1% level of significance compared to that of treatment T 1 . Significant effect was found either for the treatment or for the varieties on the number of effective and total tillers hill -1, plant height, number of effective tillers hill-1, grain yield, straw yield, biological yield and harvest index.

Standardization of Alternate Wetting and Drying (AWD) Method of Water Management in Lowland Rice (ORYZA SativaL.) for Upscaling in Command Outlets

“…The significantly lowest panicle weight was registered by the crop in I 8 (AWD irrigation regime of 3 cm from transplanting to PI stage and thereafter 5 cm up to physiological maturity when the water level drops to 15 cm below ground level in field water tubes) on a pooled basis. These results were similar to previous findings for rice subjected to water stress conditions (Boonjung and Fukai, ; Bakul et al, ; Azarpour et al ., ; Rahman and Sheikh, ; Kumar et al ., 2014).…”

Alternate wetting and drying in Bangladesh: Water‐saving farming practice and the socioeconomic barriers to its adoption

“…Various experiments have reported water saving in AWD plots of 20% (Oliver et al., ; Paul et al. , ), while Rahman and Bulbul () found that all of the AWD treatments significantly increased yield when compared to the standing water control plots. This contrasts, however, with Oliver et al.…”

“…The decision over when to start AWD will significantly impact the water saving achieved by the practice, but the literature is not yet decided on a definite answer. It is also unclear as yet what this standing water is for, whether it is to reduce weeds (Rahman & Bulbul, ), to aid crop establishment (Lampayan, Samoy‐Pascual, et al., ), to ensure maximum nitrogen uptake before water is allowed to drain (Linquist et al., ), or perhaps a combination of these factors.…”

“…Various bodies within Bangladesh have been trialing and promoting AWD. Field trials were carried out at the BRRI sites at Gazipur (Islam et al., ; Paul, Rachid, & Paul, ; Rahman & Bulbul, ) and Bhanga (Rahman, Islam, Hassan, Islam, & Zaman, ) as well as at the Bangladesh Agricultural University farm at Mymensingh (Norton, Shafaei, et al., ; Oliver et al., ), and Lampayan, Rejesus, et al. () reported a summary of unpublished results from farmer‐participatory demonstration sites.…”

Respon Pertumbuhan Dan Hasil Tanaman Padi Terhadap Jarak Tanam Pada Lahan Tadah Hujan Dengan Menggunakan Pengairan Intermittent

“…Di sebagian besar daerah Asia, tanaman padi tumbuh kurang optimum akibat kelebihan air atau kekurangan air karena curah hujan yang tidak menentu dan pola lanskap yang tidak teratur (Rahman and Bulbul, 2014).…”