Abstract
This experiment was conducted during February to June 2012 in Demonstration farm of Arba Minch University located in the central rift valley of Ethiopia. The aim was to investigate the effects of different levels of deficit irrigation imposed at different growth stages of maize (BH-140) crop on its development, grain yield and water use efficiency. AquaCrop model was calibrated and validated using field experimentation data. The crop water requirement of maize for full irrigation application was calculated using CropWat 8.0. The water application levels considered were 100% of crop evapotranspiration (ETc), 75%ETc, 50%ETc and 25%ETc. based on these irrigation levels and four growth stages of maize crop, ten treatments were arranged. These treatments were replicated three times. Data collected during the experiment were: crop biomass, soil moisture content, irrigation depths and final yield. The result showed that the highest yield was found in treatment six, T6 (8842 Kg/ha) which was subjected to water deficit during mid- and maturity-stages; whereas minimum yield of about 5264 kg/ha was obtained under T8 which was irrigated imposed to deficit during the whole growing season except during the initial stage. The highest (2.11 kg/m3) and lowest (0.93 kg/m3) water use efficiency was recorded under T8 and T4. Generally, water deficit of 50%ETc during third and fourth growth stages had no significant effect on the grain yield of maize and it is worthwhile to save irrigation water during these growth stages. The model performed well in simulating the growth of aboveground biomass, grain yield, and canopy cover (CC) for most of the treatments but it was less satisfactory in simulating the growth performance of treatments under prolonged water-deficit. The fact that the AquaCrop model is easy to use, requires less input data, and its sufficient degree of simulation accuracy make it a valuable tool for estimating crop productivity under deficit irrigation, and on-farm water management for improving the efficiency of water use in agriculture. Key words: Deficit irrigation, growth stage, maize, crop water productivity, AquaCrop.
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The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Maize treatment T6, deficit irrigation at mid and maturity stages, had the highest grain yield of 8842 Kg/ha.
- Treatment
- water deficit during mid- and maturity-stagese0
- Outcome
- yielde0
- Direction
- higheste0
- Value
- 8842 Kg/hae0
- Setting
- Arba Minch, Ethiopiat0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest yield was found in treatment six, T6 (8842 Kg/ha) which was subjected to water deficit during mid- and maturity-stages”
t0“Field experimentation based simulation of yield response of maize crop to deficit irrigation using AquaCrop model, Arba Minch, Ethiopia”
Claim · model-written summary
Maize treatment T8, deficit irrigation throughout the growing season except the initial stage, had the minimum grain yield, about 5264 kg/ha.
- Treatment
- deficit during the whole growing season except during the initial stagee0
- Outcome
- yielde0
- Direction
- minimume0
- Value
- 5264 kg/hae0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“minimum yield of about 5264 kg/ha was obtained under T8 which was irrigated imposed to deficit during the whole growing season except during the initial stage”
t0“Field experimentation based simulation of yield response of maize crop to deficit irrigation using AquaCrop model, Arba Minch, Ethiopia”
Claim · model-written summary
Treatment T8 had the highest maize water use efficiency, 2.11 kg/m3.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest (2.11 kg/m3) and lowest (0.93 kg/m3) water use efficiency was recorded under T8 and T4.”
t0“Field experimentation based simulation of yield response of maize crop to deficit irrigation using AquaCrop model, Arba Minch, Ethiopia”
Claim · model-written summary
Treatment T4 had the lowest maize water use efficiency, 0.93 kg/m3.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest (2.11 kg/m3) and lowest (0.93 kg/m3) water use efficiency was recorded under T8 and T4.”
t0“Field experimentation based simulation of yield response of maize crop to deficit irrigation using AquaCrop model, Arba Minch, Ethiopia”
Claim · model-written summary
A 50%ETc water deficit during the third and fourth growth stages had no significant effect on maize grain yield.
- Treatment
- water deficit of 50%ETc during third and fourth growth stagese0
- Outcome
- grain yielde0
- Direction
- no significant effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water deficit of 50%ETc during third and fourth growth stages had no significant effect on the grain yield of maize”
Claim · model-written summary
AquaCrop simulated maize aboveground biomass, grain yield, and canopy cover well for most treatments.
- Outcome
- aboveground biomass, grain yield, and canopy cover (CC)e0
- Direction
- performed welle0
- Qualifier
- most of the treatmentse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The model performed well in simulating the growth of aboveground biomass, grain yield, and canopy cover (CC) for most of the treatments”
t0“Field experimentation based simulation of yield response of maize crop to deficit irrigation using AquaCrop model, Arba Minch, Ethiopia”
Claim · model-written summary
AquaCrop was less satisfactory at simulating growth under prolonged maize water deficit.
- Outcome
- growth performancee0
- Direction
- less satisfactorye0
- Qualifier
- prolonged water-deficite0
- Comparator
- most of the treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for most of the treatments but it was less satisfactory in simulating the growth performance of treatments under prolonged water-deficit”
t0“Field experimentation based simulation of yield response of maize crop to deficit irrigation using AquaCrop model, Arba Minch, Ethiopia”
Claim · model-written summary
The authors recommend saving irrigation water by applying a 50%ETc deficit during the third and fourth maize growth stages.
- Treatment
- water deficit of 50%ETc during third and fourth growth stagese0
- Outcome
- save irrigation watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water deficit of 50%ETc during third and fourth growth stages had no significant effect on the grain yield of maize and it is worthwhile to save irrigation water during these growth stages”
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