Effect of Deficit Irrigation on Raised Bed Wheat Cultivation

Abstract

ABSTRACT.The experiment was conducted during Rabi season of 2015-2016 and 2016-2017 at the Regional Agricultural Research station, BARI, Ishurdi, Pabna, Bangladesh, to determine the water requirements of wheat on raised bed and the effect of different deficit irrigation on yield, water use efficiency and applied water productivity under raised bed wheat. This study consisted of following irrigation treatments: T 1 = Irrigations up to 100% field capacity (FC) at crown root initiation (CRI), botting and grain filling stages (flat bed), T 2 = Irrigations up to 100% FC at CRI, botting and grain filling stages on raised bed, T 3 = Irrigations up to 80% FC at CRI, botting and grain filling stages on raised bed and T 4 = Irrigations up to 60% FC at CRI, botting and grain filling stages on raised bed and laid out in a randomize complete block design with three replications.The result showed that significant effect of irrigation treatments were observed on plant height, spike per m 2 and grain yield. Highest grain yield (4.66 t/ha) was obtained from treatment, irrigations up to 100% FC at CRI, botting and grain filling stages on raised bed, followed by irrigation up to 100% FC at same stages on flat bed. At raised bed wheat cultivation saving 14.30% water with increasing 15.66% grain yield than flat bed. Besides, comparing deficit irrigation (20% and 40% of full irrigation) and full irrigation condition on raised bed seeding system water use could be reduced about 4.18% to 5.57%, while scarifying 18.20% to 32.33% grain yield, where reduced 14.17% to 27.54% water use efficiency. Maximum applied water productivity 1.81 kg m -3 was observed in raised bed full irrigation condition. The rate of daily evaporation started to increase as the temperature started to rise and humidity started to decrease during the crop growing period. The results will be helpful for taking policy decision regarding efficient irrigation and water management under prevailing water scarce situation.

Using Eight Crops to Show the Correlation between Paucity Irrigation and Yield Reduction of Al-Hussainiyah Irrigation Project in Karbala, Iraq

“…For example, Eissa and Roshdy selected maize to show the best rate of nitrogen quantity by using two various deficit irrigation; however, they did not select more than one to show the similarities and differences between them relative to nitrogen and/or other parameters by choosing many deficit irrigation levels [13]. Similarly, Zaman et al used one crop (bed wheat) to show the effect of four deficit irrigation levels on the properties of the plant, such as height, grain yield, and spike per meter square, which means they did not mention to other crops relative to their properties when using different stages of irrigation water [19].…”

“…Paucity irrigation has been applied in many crops to save water and to achieve water use efficiency in crops such as Phillyrea angustifolia [7], Beta vulgaris L. var. cicla [8], sugar beet [9], maize [10][11][12][13][14], corn [15], wheat [16][17][18][19], potato [20][21][22], onion [23], cucumber [24], olive trees [25], almond [26], plum fruit [27], tomato [28], and other species.…”

“…e relation between crop evapotranspiration and yield response was linear, a quadratic relationship between irrigation and seed yields, but results showed increasing yield response against decreasing irrigation discharge. Similarly, Zaman et al determined the effect of various paucity irrigation rates on yield and efficiency of water use for bed wheat [19]. Studies tried to convince upcoming researchers to go with adopting deficit irrigation as a better mechanism than other ways; however, they mentioned many limitations in their hypothesis such as selecting season and using some crop types for short periods.…”

“…A paucity irrigation method by adopting different levels of irrigation was selected by some researchers. Zaman et al used four levels of irrigation to monitor the paucity irrigation outcomes, using 20% and 40% irrigation rate, which saved water by 14.30% and increased 15.66% seed yield; however, water discharge was 1.81 kg/m 3 to achieve full irrigation [19]. Similarly, Tarkalson and King chose eight irrigation cases including crop evapotranspiration with rates (100%, 65%, and 55%) [9].…”

Performance of Lentil as Affected by Reduced Tillage and Mechanical Seeding

“…Islam (2016) also reported that the yield of lentil was higher by 23% in ST and 18% in BP compared with CT for lentil. Besides, Zaman et al (2017) reported that at raised bed wheat cultivation increasing 15.66% grain yield than CT. Saeed (2013) also reported that, yield of wheat with happy seeder were 18% and 15% higher than minimum and conventional tillage respectively.…”