Evaluation of a crop water stress index for irrigation scheduling of bermudagrass

Emekli, Yaşar; Baştuğ, Ruhi; Büyüktaş, Dursun; Emekli, Nefise Yasemin

doi:10.1016/j.agwat.2007.03.008

Cited by 46 publications

(20 citation statements)

References 33 publications

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“…The CWSI tends towards 0 after irrigations and progressively climbs towards 1 as soil water is depleted. Many studies have used differential irrigation amounts on different crops and calculated the corresponding CWSI values (alfalfa -Hattendorf et al, 1988;sorghum -Olufayo et al, 1996;Bermuda grass -Farahani et al, 1993;Emekli et al, 2007;corn -Yazar et al, 1999;cotton -Barbosa da Silva and Rao, 2005). A few studies have used an established CWSI value to trigger irrigations on soybean (Nielsen, 1990) and wheat (Garrot et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

A crop water stress index and time threshold for automatic irrigation scheduling of grain sorghum

O’Shaughnessy

Evett

Colaizzi

et al. 2012

Agricultural Water Management

116

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a b s t r a c tVariations of the crop water stress index (CWSI) have been used to characterize plant water stress and schedule irrigations. Usually, this thermal-based stress index has been calculated from measurements taken once daily or over a short period of time, near solar noon or after and in cloud free conditions. A method of integrating the CWSI over a day was developed to avoid the noise that may occur if weather prevents a clear CWSI signal near solar noon. This CWSI and time threshold (CWSI-TT) was the accumulated time that the CWSI was greater than a threshold value (0.45); and it was compared with a time threshold (CWSI-TT) based on a well-watered crop. We investigated the effectiveness of the CWSI-TT to automatically control irrigation of short and long season grain sorghum hybrids (Sorghum bicolor (L.) Moench, NC+ 5C35 and Pioneer 84G62); and to examine crop response to deficit irrigation treatments (i.e. 80%, 55%, 30% and 0% of full replenishment of soil water depletion to 1.5-m depth). Results from automated irrigation scheduling were compared to those from manual irrigation based on weekly neutron probe readings. In 2009, results from the Automatic irrigation were mixed; biomass yields in the 55% and 0% treatments, dry grain yields in the 80% and 0% treatments, and WUE in the 80%, 55%, and 0% treatments were not significantly different from those in the corresponding Manual treatments. However, dry grain yields in the 55% and 30% treatments were significantly less than those in the Manual control plots. These differences were due mainly to soil water variability in the beginning of the growing season. This conclusion is reinforced by the fact that IWUE for dry grain yield was not significantly different for 30% and 55% treatments, and was significantly greater for Automatic control at 80%. In 2010, there were no significant differences in biomass, dry grain yield, WUE, or IWUE for irrigation control methods when compared across the same amount treatments. Similar results between irrigation methods for at least the highest irrigation rate (80% of soil water depletion) in 2009 and among all irrigation treatment amounts in 2010 indicate that the CWSI-TT method can be an effective trigger for automatically scheduling either full or deficit irrigations for grain sorghum in a semi-arid region.Published by Elsevier B.V.

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Section: Introductionmentioning

confidence: 99%

A crop water stress index and time threshold for automatic irrigation scheduling of grain sorghum

O’Shaughnessy

Evett

Colaizzi

et al. 2012

Agricultural Water Management

116

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“…Although our study was conducted under a sub-humid climatic condition, the applied irrigation water and ETc values were close to the values obtained in studies conducted under arid climatic conditions. The reason for this result was due to the longer irrigation period in our study, which was a month longer than the studies of Bastug and Buyuktas (2003) and Emekli et al (2007).…”

Section: Resultsmentioning

confidence: 39%

“…Under Mediterranean climatic conditions, Bastug and Buyuktas (2003) reported that the total amount of water applied and the total ET of golf course turfgrass were found as 780.3 mm and 896 mm, respectively, under an irrigation treatment in which kp was set to 1.00. In a Mediterranean climate, Emekli et al (2007) found that the total irrigation water and amount of seasonal water used for bermudagrass at 100% of the Class A pan were 1168.2 mm and 1186 mm, respectively. Although our study was conducted under a sub-humid climatic condition, the applied irrigation water and ETc values were close to the values obtained in studies conducted under arid climatic conditions.…”

Section: Resultsmentioning

confidence: 99%

Growth and Quality Responses of Tall Fescue (Festuca arundinacea Schreb.) to Different Irrigation Levels and Nitrogen Rates

Candogan¹,

Bilgili²,

Yazgan³

et al. 2014

Turkish Journal of Field Crops

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A 2-year experiment was conducted to investigate the effects of different irrigation levels and nitrogen rates on visual turfgrass colour and quality and clipping yield of tall fescue (Festuca arundinacea Schreb.) under subhumid climatic conditions. The treatments consisted of five levels of irrigation, 25% (I1), 50% (I2), 75% (I3), 100% (I4) and 125% (I5), of the evaporation measured from a Class A pan and two rates of nitrogen, 25 kg N ha -1 (N1) and 50 kg N ha -1 (N2). The N rates were applied as a monthly rate during growing seasons (MaySeptember). The experimental area was irrigated by a pop-up sprinkler irrigation system. The irrigation was applied at 3-day intervals during May-September for both years. The seasonal crop evapotranspiration (ETc) under the treatments ranged from 315 to 1154 mm in 2007 and from 363 to 1100 mm in 2008. The ETc increased with increasing the both N rate and irrigation level, and the best seasonal turf quality of tall fescue was obtained for the I4 and I5 treatments under N2 rate. This study demonstrated that, when the level of irrigation and nitrogen rate were evaluated together, the N2I4 treatment ensured sufficiently dark turf colour and quality. Based on the results of this study, it is concluded that an acceptable turf quality can be sustained under the N1I1 treatment in May, N1I2 treatment in June, July and August and N1I4 treatment in September (or N2I2 treatment in September) according to water conservation. When rainfall amountis high (132.2 mm) in September, the N1I1 treatment may sustain acceptable turf quality for this month.

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“…The negative correlation between grain yield and CWSI has been also reported by some authors on other crops (Emekli et al 2007;Irmak, Haman, and Bastug 2000;Orta, Erdem, and Erdem 2003). Researchers studying soil-plant water relations have proved that slight water stress has no significant effects on crop growth, but the yields are reduced only when the water stress exceeds a certain degree.…”

Section: Correlation Between Cwsi and Yield Affected By N Fertilizationmentioning

confidence: 66%

“…Our study further shows that the correlation between CWSI and crop yield changed with N fertilization levels, revealing that when CWSI is used in predicting crop water stress or estimating the yield, the equation between CWSI and yield should be established on the comparable N fertilization levels. Second, CWSI is a tool widely used in irrigation scheduling (Emekli et al 2007;Gontia and Tiwari 2008;Orta et al 2004;Yazar et al 1999), yet, this study showed that CWSI would also be used in N fertilization management strategy. The result demonstrates the mean threshold values of CWSI for corn in 2007 and 2008 were 0.20 and 0.23, respectively, beyond which further N fertilization significantly aggravated the reduction of corn yield.…”

Section: Discussionmentioning

confidence: 91%

High Rate of Nitrogen Fertilization Increases the Crop Water Stress Index of Corn under Soil Drought

Lin

Chen

Cai

2012

Communications in Soil Science and Plant Analysis

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Soil nitrogen (N) availability is dominated by soil water regime and the N fertilizerlevels, which affect crop growth in soil water stress. To determine the optimum N applications under different degrees of soil drought, this study investigated the effects of N fertilizer levels on the crop water stress index (CWSI) of summer corn under soil water stress. A 2-year field experiment was conducted in waterproof plots in upland red soils in subtropical China. Three N fertilizer levels and seven soil water deficit levels were employed in 2007 and 2008. Nitrogen fertilization had no influence on the CWSI of the corn under slight to moderate soil drought, but the high-N treatment increased the CWSI significantly (P < 0.01) under soil drought when the mean CWSI exceeded ∼0.20. The results suggested that for scheduling irrigation or predicting crop yields, the equations between CWSI and yield should be established on comparable N fertilization levels.

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Evaluation of a crop water stress index for irrigation scheduling of bermudagrass

Cited by 46 publications

References 33 publications

A crop water stress index and time threshold for automatic irrigation scheduling of grain sorghum

A crop water stress index and time threshold for automatic irrigation scheduling of grain sorghum

Growth and Quality Responses of Tall Fescue (Festuca arundinacea Schreb.) to Different Irrigation Levels and Nitrogen Rates

High Rate of Nitrogen Fertilization Increases the Crop Water Stress Index of Corn under Soil Drought

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