EGU21-8349, updated on 04 Mar 2021
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Assessing yield and water use efficiency of Capsicum annuum L. cultivated in a greenhouse under different irrigation strategies

Ceres Duarte Guedes Cabral de Almeida1, Leandro Candido Gordin1, Alexsandro Cláudio dos Santos Almeida2, José Amilton Santos Júnior1, Brivaldo Gomes de Almeida1, and Giuseppe Provenzano3
Ceres Duarte Guedes Cabral de Almeida et al.
  • 1Federal Rural University of Pernambuco, Brazil (;;;
  • 2Federal University of Alagoas, Brazil (
  • 3Università degli Studi di Palermo, Italy (

Several methodologies and techniques are available for irrigation management in protected environments. Despite the cultivation of vegetables in the greenhouse is largely present in the northeastern region of Brazil, not many research has been aimed at supporting growers for accurate irrigation management.

The objective of this study is to evaluate yield and irrigation water use efficiency of Capsicum crop cultivated in a greenhouse under different methods to define the daily irrigation depth, based on the soil water status and the atmospheric evaporative demand. Moreover, two different strategies to apply the estimated irrigation depths (single or double daily application) were also examined.

The experiment was carried out in a greenhouse in the Federal Rural University of Pernambuco (UFRPE), northeastern of Brazil (8° 01’ 07” S and 34° 56’ 53” W, altitude 6.50 m). Based on a completely randomized design, the experimental units were distributed according to a 4 x 2 factorial scheme with eight replications, with a total of 64 experimental units. Four methods to estimate daily irrigation water requirement were evaluated: two based on soil sensors (soil water content sensors EC-5, SWS, and tensiometers, TS), whereas the other two were based on the atmospheric evaporative demand (weighing lysimeter, WL, and Piché evaporimeter, PE). Moreover, the daily irrigation depths were applied with a single watering (at 8:00 am) or split into two applications (the half at 8:00 am and the half at 4:30 pm). The commercial yield of the examined crop was calculated through the relationship between the weight of fresh fruit and the area occupied by the plant.

The statistical analysis showed that the water use efficiency, the total water volume applied and the commercial yield of capsicum were significantly influenced by the method used to estimate crop water requirement, as well as the irrigation strategies. The total irrigation depth applied during the entire crop cycle resulted in equal to 509 mm, 678 mm, 716 mm, and 790 mm for treatments with WL, PE, SWS, and TS, respectively. The seasonal applied irrigation depths corresponded to an average daily crop water requirement ranging, according to the treatments, from 5.4 to 8.3 mm day-1; these values are consistent for the examined crop cultivated under protected conditions. The highest yields of commercial fruits were obtained in the treatments in which the highest irrigation depth (SWS and TS) was applied. On the other hand, the highest values of water use efficiency were obtained in those treatments in which the irrigation depth was defined based on SWS and WL. Splitting the estimated daily irrigation depth in two applications promoted greater commercial productivity and water use efficiency (10.73 t ha-1 and 1.60 kg m-3) compared to a single application (8.14 t ha-1 and 1.22 kg m-3), with an increase of both variables of about 31%. These results evidenced that splitting the daily irrigation depth is a promising strategy to increase water use efficiency for vegetable crops in protected environments.

How to cite: Almeida, C. D. G. C. D., Gordin, L. C., Almeida, A. C. D. S., Santos Júnior, J. A., Almeida, B. G. D., and Provenzano, G.: Assessing yield and water use efficiency of Capsicum annuum L. cultivated in a greenhouse under different irrigation strategies, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-8349,, 2021.


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