ISSN 2394-5125
 

Review Article 


DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET

Shavkat Kenjabaev, Hans Georg Frede, Ilkhom Begmatov, Sabirjan Isaev, Bakhtiyar Matyakubov.

Abstract
Determination of the actual crop evapotranspiration (ETc) during the growing period is important for accurate irrigation scheduling in arid and semi-arid regions. Development of a crop coefficient (Kc) can enhance ETc estimations in relation to specific crop phenological development. This research was conducted to determine ETc values as well as daily and growth-stage-specific Kc for cotton, winter wheat and maize for silage at fields in Fergana Valley (Uzbekistan). The soil water balance model - BUDGET with integration of the dual crop procedure of the FAO - 56 was used to estimate the ETc and separate it into evaporation (Ec) and transpiration (Tc) components. An empirical equation was developed to determine the daily Kc values based on the estimated Ec and Tc. The Kc determination and comparison to existing FAO Kc values were performed based on 10, 5 and 6 study cases for cotton, wheat and maize, respectively. Mean seasonal amounts of crop water requirement in terms of ETc were 560 50, 509 27 and 243 39 mm for cotton, wheat and maize, respectively. Estimated ETc for these crops were 1.10 - fold, 1.09 - fold and 0.73 - fold of recommended irrigation norm according to currently used hydromodule zoning (GMR) under semi-hydromorphic reclamation regime in Fergana province. The growth-stage-specific Kc for cotton, wheat and maize was 0.15, 0.27 and 0.11 at initial; 1.15, 1.03 and 0.56 at mid; and 0.45, 0.89 and 0.53 at late season stages. These Kc values correspond to those reported by the FAO - 56. Development of site specific Kc helps tremendously in irrigation management and furthermore provides precise water applications in the region. The developed simple approach to estimate daily Kc for the three main crops grown in the Fergana region was a first attempt to meet this issue.

Key words: Actual crop evapotranspiration, evaporation and transpiration, crop coefficient, BUDGET, Fergana Valley.


 
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How to Cite this Article
Pubmed Style

Shavkat Kenjabaev, Hans Georg Frede, Ilkhom Begmatov, Sabirjan Isaev, Bakhtiyar Matyakubov. DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET. JCR. 2020; 7(5): 340-349. doi:10.31838/jcr.07.05.67


Web Style

Shavkat Kenjabaev, Hans Georg Frede, Ilkhom Begmatov, Sabirjan Isaev, Bakhtiyar Matyakubov. DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET. http://www.jcreview.com/?mno=98128 [Access: August 17, 2021]. doi:10.31838/jcr.07.05.67


AMA (American Medical Association) Style

Shavkat Kenjabaev, Hans Georg Frede, Ilkhom Begmatov, Sabirjan Isaev, Bakhtiyar Matyakubov. DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET. JCR. 2020; 7(5): 340-349. doi:10.31838/jcr.07.05.67



Vancouver/ICMJE Style

Shavkat Kenjabaev, Hans Georg Frede, Ilkhom Begmatov, Sabirjan Isaev, Bakhtiyar Matyakubov. DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET. JCR. (2020), [cited August 17, 2021]; 7(5): 340-349. doi:10.31838/jcr.07.05.67



Harvard Style

Shavkat Kenjabaev, Hans Georg Frede, Ilkhom Begmatov, Sabirjan Isaev, Bakhtiyar Matyakubov (2020) DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET. JCR, 7 (5), 340-349. doi:10.31838/jcr.07.05.67



Turabian Style

Shavkat Kenjabaev, Hans Georg Frede, Ilkhom Begmatov, Sabirjan Isaev, Bakhtiyar Matyakubov. 2020. DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET. Journal of Critical Reviews, 7 (5), 340-349. doi:10.31838/jcr.07.05.67



Chicago Style

Shavkat Kenjabaev, Hans Georg Frede, Ilkhom Begmatov, Sabirjan Isaev, Bakhtiyar Matyakubov. "DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET." Journal of Critical Reviews 7 (2020), 340-349. doi:10.31838/jcr.07.05.67



MLA (The Modern Language Association) Style

Shavkat Kenjabaev, Hans Georg Frede, Ilkhom Begmatov, Sabirjan Isaev, Bakhtiyar Matyakubov. "DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET." Journal of Critical Reviews 7.5 (2020), 340-349. Print. doi:10.31838/jcr.07.05.67



APA (American Psychological Association) Style

Shavkat Kenjabaev, Hans Georg Frede, Ilkhom Begmatov, Sabirjan Isaev, Bakhtiyar Matyakubov (2020) DETERMINATION OF ACTUAL CROP EVAPOTRANSPIRATION (ETC) AND DUAL CROP COEFFICIENTS (KC) FOR COTTON, WHEAT AND MAIZE IN FERGANA VALLEY: INTEGRATION OF THE FAO-56 APPROACH AND BUDGET. Journal of Critical Reviews, 7 (5), 340-349. doi:10.31838/jcr.07.05.67