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| International Agrophysics |
| wydawca: | Instytut Agrofizyki
im. B. Dobrzańskiego
PAN
w Lublinie |
| ISSN: |
0236-8722 |
vol. 20, nr. 4 (2006)
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poprzedni artykuł wróć do listy artykułów następny artykuł
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Simulating the effects of irrigation scheduling on cowpea yield
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| (pobierz wersję PDF )
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Adekalu K.O.
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Agricultural Engineering Department, Obafemi Awolowo University, Ile-Ife, Nigeria
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vol. 20 (2006), nr. 4,
pp. 261-268
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streszczenie
The CRPSM model developed by Hill et al.
(1996) was modified, calibrated and tested using cowpea-water use
and weather data collected under line source sprinkler system at
Ile-Ife, Nigeria. Three sets of data were collected. The first was
used to calibrate and modify the model and the other two for
testing. Simulated irrigation schedules were then applied using two
of the four management options in the model to select the best
schedules for the region. The water yield index (WYI) defined as
the products of the model predicted relative yield (percent) and the
transpiration water ratio (transpiration/water applied) was used to
select the best schedule.
The results showed that WYI ranged from 52% for irrigation
level one in 1999 to 8% for irrigation level five in 1997, when the
model was applied to actual field data. However, with simulation
runs, a six day interval provided a WYI of 66% for irrigation level
one in 1999 and a two day interval provided a WYI of 9% for
irrigation level five in 1997 using almost the same amount of water.
The model, therefore, proved to be useful in estimation of possible
irrigation schemes to maximize yields.
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słowa kluczowe
cowpea yields, water use index, irrigation
scheduling, modelling
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