saeidi, R., Ramezani Etedali, H., Sotoodehnia, A., kaviani, A., Nazari, B. (2018). Determination of the Relationships between Yield and Evapotranspiration of Maize under Salinity Stress and Nitrogen Deficiency Conditions. , 32(3), 351-366. doi: 10.22092/jwra.2018.117791
reza saeidi; Hadi Ramezani Etedali; Abbas Sotoodehnia; abbas kaviani; Bijan Nazari. "Determination of the Relationships between Yield and Evapotranspiration of Maize under Salinity Stress and Nitrogen Deficiency Conditions". , 32, 3, 2018, 351-366. doi: 10.22092/jwra.2018.117791
saeidi, R., Ramezani Etedali, H., Sotoodehnia, A., kaviani, A., Nazari, B. (2018). 'Determination of the Relationships between Yield and Evapotranspiration of Maize under Salinity Stress and Nitrogen Deficiency Conditions', , 32(3), pp. 351-366. doi: 10.22092/jwra.2018.117791
saeidi, R., Ramezani Etedali, H., Sotoodehnia, A., kaviani, A., Nazari, B. Determination of the Relationships between Yield and Evapotranspiration of Maize under Salinity Stress and Nitrogen Deficiency Conditions. , 2018; 32(3): 351-366. doi: 10.22092/jwra.2018.117791

Determination of the Relationships between Yield and Evapotranspiration of Maize under Salinity Stress and Nitrogen Deficiency Conditions

پژوهش آب در کشاورزی
Article 3, Volume 32, Issue 3, November 2018, Pages 351-366    PDF (1.2 M)
Document Type: Research Paper
DOI: 10.22092/jwra.2018.117791
Authors
reza saeidi1; Hadi Ramezani Etedali* 2; Abbas Sotoodehnia3; abbas kaviani4; Bijan Nazari5
1Ph.D candidate of irrigation and drainage Engineering, Imam Khomeini International University
2Assistant professor, Dept. of Water Sciences and Engineering, Imam Khomeini International University
3Associate professor, Dept of Water Engineering, Imam Khomeini International University
4Assistant professor, Dept of Water Engineering, Imam Khomeini International University
5Science and engineering water of engineering department IKIU, Qazvin, Iran
Abstract
In this study, yield and evapotranspiration of maize (cv. SC 704) were investigated under salinity stress and nitrogen deficiency. The experiment was carried out in a randomized complete block design. Electrical conductivities of saline water treatments were 0.5( 15S0"> ), 2.1( 15S1)"> , 3.5( 15S2) "> , and 5.7( 15S3) "> dS. 15m-1"> . Nitrogen deficiency treatments were 100% ( 15F0"> ), 75% ( 15F1"> ), 50% ( 15F2"> ), and 25% ( 15F3"> ) of nitrogen fertilizer requirement based on soil testing. The treatments were carried out in three replications and in plots with area of 9 m2. In different treatments, evapotranspiration of maize was between 220 to 349 mm and dry matter yield between 9.4 to 15.2 ton.ha-1. With increase in the salinity levels in , , , and  treatments, the slopes of yield function were estimated as 0.2, 0.207, 0.218, and 0.231, respectively. Also, with reduction of nitrogen at salinity levels of , ,  and , the slopes were estimated as 0.175, 0.182, 0.194 and 0.221, respectively. The results showed that, with increasing stresses, yield of maize decreased more than evapotranspiration. The coefficient of  was calculated using the Doorenbos-Kassam relationship. With reduction of nitrogen at salinity levels of , ,  and , values of  coefficient were estimated as 1.01, 1.048, 1.119, and 1.272, respectively. Also, with increase in the salinity at nitrogen levels of , ,  and , Ky values were estimated as 1.15, 1.19, 1.258, and 1.328, respectively. On the average, Ky was calculated as 1.27. Under the highest stress 15 S3F3"> , water and nitrogen use efficiency decreased by: 38% and 34.5%, respectively, compared to the control treatment (S0F0). The results showed that the water requirement and yield of maize under the mentioned stresses were less than the region’s potential. Under these conditions, by supplying soil nitrogen and reducing water use, water resources will be used optimally and yield will increase.
Keywords
Coefficient of yield function; Doorenbos-Kassam relationship; Water and nitrogen use efficiency
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