International Conference on Rain Water Cistern Systems
"Rainwater Catchment for Future Generations"
Keelung, Taiwan, R.O.C. - August 1991
6: Socioeconomic Aspects and Cost Analysis
Economics of Flood Irrigated
Cereal Hay Production
& Esmail Rahbar
Research Institute of Forests and Rangelands, Iran
Insufficient rainfall makes dry-farming an undependable method of food and
feed production in many parts of Iran. Moreover, groundwater (GW) mining for irrigation
of crop is threatening the very existence of the desert dwellers. Therefore, augmentation
and conservation of GW for later, wise utilization holds the key to the prosperity
of the future generations. Flood-water spreading (FWS) is a very easy and economical
means of crop production in the arid and semi-arid areas
Flood irrigation of wheat and hay in the e Joonegan County, Mamassani (mean
annual precipitation, MAP- 579mm) in 500 ha of rainfed wheatfields during the
1980-81 growing season resulted in substantial gains in grain and hay production.
The grain yield on a 40 ha tract ranged 1214-1685 kg ha-1. The highest grain yield
in control farms was 700 kg ha-1. T'he forage yield ranged from 1500 kg hasup-1
for Medicago scutellata Mill. to 300 k ha-1 for Trifolium alexand it num L. Improved
yield for wheat of up o 3200 kg ha-1 have been reported of up to 4300 kg ha-1,
and for medic of up to 3200 kg ha-1 have been reported for more recent years.
Disregarding the extra benefits accrued through artificial recharge (AR) and flood
mitigation (FM), the benefit to cost ratio (C) was 5.1.
A 650 ha FWS system was constructed in the e SE corner of the Gareh Bygone
Plain (MAP=150mm) for barley reduction. The grain yield of individual farms ranged
700-2000 kg ha.-1 with the mean of 1400 kg ha-l in the 1984-85 crop season. The
highest grain yield of control plots was 700 kg ha-1, Disregarding the extra benefits
accrued through Area of GW,. FM, and forage production in the fallow period, the
BCR compounded yearly at 15% for 10 years was 2.2. Should the real cost of irrigated
grain and hay production be considered, the BCR would be larger than the reported
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