Yield and Water Use of Cabbage under Different Irrigation Schedules in Bangladesh.

概要

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Seven different irrigation schedules along with an unirrigated control treatment were tested on the cabbage (<I>Brassica oleracea</I> var. <I>capitata</I> L.) cultivar, Atlas 70 in a silty-clay-loam Plinthic Paleustult of Bangladesh during the 1993-94 growing period. The irrigation schedules were as follows; irrigation of the crop by allowing 60, 45, 30 and 15% depletion of available soil moisture (DASM) and supply of 20 mm irrigation water (IW) at IW: CPE (cumulative pan evaporation) ratios of 0.6, 0.9 and 1.2. Both gross and marketable yields of cabbage recorded in the plots irrigated at 30 and 15% DASM (5 and 8 irrigations) as well as at IW: CPE ratios of 0.9 and 1.2 (5 and 6 irrigations) were identical and significantly higher than those in all the other treatments. Thus the findings clearly indicated that cabbage may be grown with irrigation considering these criteria in order to achieve satisfactory yield in the experimental area. The total water use by cabbage for these 4 highest yielding irrigation schedules ranged from 158.44 to 183.23 mm. Maximum efficiency of irrigation water in terms of marketable yield (602.35 kg/ha/mm) was achieved when irrigation led to 30% DASM.
日本熱帯農業学会の論文