Yield and economic return of vegetable crops under variable irrigation |
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Authors: | M Imtiyaz N P Mgadla S K Manase K Chendo E O Mothobi |
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Institution: | (1) Department of Agricultural Research, Regional Agricultural Research Office, P.O. Box 151, Maun, Botswana Fax: +267-660327, BW |
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Abstract: | Field experiments were conducted for 2 years (1997 and 1998) on sandy loam soil in northwestern Botswana to study the effect
of five levels of pan evaporation replenishment (20, 40, 60, 80 and 100%) on marketable yield, yield components, irrigation
production efficiency and economic return of winter broccoli, carrot, rape and cabbage under a drip irrigation method. The
highest mean marketable yield (2 years) of broccoli (19.1 t/ha), carrot (58.9 and 32.9 t/ha), rape (61.8 t/ha) and cabbage
(97.2 t/ha) was recorded at 80% of pan evaporation replenishment. The irrigation production efficiency of broccoli (5.9 kg/m3), rape (14.6 kg/m3) and cabbage (23.6 kg/m3) was maximum at 80, 20 and 60% of pan evaporation replenishment respectively. Irrigation replenishment up to 80% of pan evaporation
loss did not influence the irrigation production efficiency for total and root yield of carrot. The results revealed that
a further increase in irrigation amount resulting from 100% of pan evaporation replenishment did not increase the marketable
yield of crops but reduced the irrigation production efficiency significantly. The seasonal water applied and marketable yield
of broccoli, carrot, rape and cabbage showed quadratic relationships (R
2 = 0.85–0.98), which can be used for allocating irrigation water within and between the crops. The net return increased with
the increase in pan evaporation replenishment. The results revealed that the rape crop is the most remunerative, followed
by cabbage, broccoli and carrot.
Received: 2 November 1998 |
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