Effect Of Deficit Irrigation And Mulch On Water
Use And Yield Of Drip Irrigated Onions
Author(s)
A. A. Ramalan, H. Nega & M. A. Oyebode
Abstract
A field experiment was conducted at Melkassa Agricultural Research Centre in
the Central Rift Valley of Ethiopia (located at latitude 8° 24'N, longitude 39°
21'E and altitude 1,550 m above sea level) during the 2008/2009 dry season to
study the ‘Effect of deficit irrigation and different mulch covers on water use and
yield of drip irrigated onion (Allium Cepa L., cultivar: Bombay Red)’. A drip
irrigation system with 144 laterals was used for the experiment. Two factors,
namely deficit irrigation at four levels (0, 25, 50 and 75% of Total Available
Water, TAW) and mulch covers of four different types (no mulch or bare soil,
straw mulch, clear plastic and black plastic) were combined in a randomized
complete block design and laid out as treatments in plots 0.4 m x 5 m. Three
replications were used. Results showed that onion bulb yield decreased with
increase in levels of water deficit. In contrast, both crop water use and irrigation
water use efficiencies increased with increase in water deficit level. Use of
mulch significantly increased bulb yield. Plots with mulch covers yielded higher
than 30 t.ha-1compared to the bare soil yield of 28.3 t.ha-1 (straw>clear
plastic>black plastic>bare soil). Water use was similarly reduced by the presence
of mulch covers. A hydraulic performance evaluation of the drip system showed
there was an average emitter flow rate variation of 13.7%, a coefficient of
uniformity of 85% and an overall irrigation application efficiency of 94.4%.
Keywords: deficit irrigation, drip irrigation, water harvesting, mulch, irrigated
onion, hydraulic performance of drip system, water use, water use efficiency.
Keywords
deficit irrigation, drip irrigation, water harvesting, mulch, irrigated
onion, hydraulic performance of drip system, water use, water use efficiency
Related Book
Other papers in this volume
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