Econometric Analysis of Effects of Nitrogenous Fertilizer Usage on Tomato Yield in Tokat, Turkey

This study aims to investigate the effects of nitrogen fertilizer application on tomato yield by using econometric models. The data obtained by questionnaire from 53 farmers who produce tomatoes in Tokat province constitute the main material of the study. The Simple Random Sampling Method was used to determine the sample size with a 90% confidence interval and 10% margin of error. Nine models were tried to determine the best model to explain the effect of nitrogenous fertilizer usage in tomato cultivation. The data in the models were used to calculate the growers’ optimal fertilizer amount of use (physical optimum and economical optimum values were calculated) and the results were compared to the ones suggested by the experts. As a result, through the statistical studies, quadratic model was found to be the most suitable one. It has been determined that tomato farmers use less (10.54 kg da-1 ) or excess (23.48 kg da-1 ) N fertilizer than the level at which economic optimum is achieved.

PDF

___

Aksoy U. 1999. Developments in Ecological Agriculture. Ecological Agriculture Organization Association Publications, Emre Publishing, İzmir.

Altintaş A, Karkacier O. 2002. Determination of economic level of fertilizer use for some crops in Kazova district of Tokat and the factors affecting fertilizer use. J. Agric. Fac., 19: 23-28. 2002. Available from: http://ziraatdergi.gop.edu.tr/Makaleler/ 295882850_23-28.pdf [Accessed: 22.02.2017].

Bayramoğlu Z. 2010. Agricultural productivity and importance. Selçuk University Journal of Agriculture and Food Sciences, 24 (3):52-61, ISSN:1309-0550.2010. Available from: http://stgbd. selcuk.edu.tr/stgbd/article/view/158/75 [Accessed: 22.02.2017],

Bilgin AE. 1996. KHGM, APK Head of Department Soil and Water Resources Research Branch Office, Soil and Water Resources Research Publication Summaries (1958-1995), Ankara.

Dağdeviren I. Özer MS. 1996. KHGM, APK Head of Department Soil and Water Resources Research Branch Office, Soil and Water Resources Research Publication Summaries (1958-1995), Ankara.

Demirtaş B. Yilmaz İ. 2003. Function analysis of different doses of fertilizer tomato production in greenhouse. Alatarım.2003, 2 (2):45-52. Available from: http://dergipark.ulakbim.gov.tr/alata/ article/viewFile/5000056670/5000053881#page=47 Accessed: 22.02.2017].

Dikici H. 2007. The effect of different yield response models and fertilizer product prices on optimum nitrogen dosages. KSU Journal of Science and Engineering, 89 10(2).

Dinç U, Şenol S, Kapur S, Cangır C, Atalay I. 2001. Turkey Territories. Faculty of Agriculture, Cukurova University. Publication No:51, Adana.

Eraslan F, İnal A, Güneş A, Erdal İ, Coşkan A. 2010. The situation of chemical fertilizer production and consumption in Turkey, problems, solution offers and reforms. TMMOB Agriculture Engineers Chamber, Agriculture Engineering VII. Technical Congress. Ankara.

Esengün K, Sayılı M, Akça H. 1999. An evaluation of fertiliser, environment and organic farming. Proceedings of XXIXth Annual Meeting of ESNA, September 7-12, Wye-Kent-UK, Published by Austrian Research Centers, pp: 143-149. Available from: http://www.iaea.org/inis/collection/ NCLCollectionStore/_Public/34/018/34018377.pdf [Accessed: 22.02.2017 ].

Güler S. 2006. Developments on Fertilizer consumption of the world and Turkey. Ondokuz Mayıs University Journal of Faculty of Agriculture. 2006. 21(2), 243-248. Samsun. http://dergi.omu.edu.tr/omuanajas/article/view/1009002399/100 9001743 [Accessed: 02.03.2017 ].

Gujarati DN. 1995. Basic Econometrics (Third Edition). McGrawHill Inc., New York. ISBN: 0-07-025214-9.

Işık Y. 2001. KHGM APK Head of Department Soil and Water Resources Research Branch Office, Soil and Water Research Yearbook, Ankara.

Kemble JM, Curtis L, Tyson TW. 2000. Guide to commercial staked tomato production in Alabama, ANR-1156, USA. Available from: http://www.aces.edu/pubs/docs/A/ANR1156/ANR-1156.pdf [Accessed: 22.02.2017.].

Karkacıer O. 2001. Functional analyses on agricultural economy and quantitative findings to be withdrawn from these analyses. Gaziosmanpaşa University, Agriculture Faculty Publications: 49, Lecture Notes Series: 26, Tokat.

Noyan OF, Karaata H, Çağatay K, Demir M, Balcın M. 2002. The effects of nitrogenous fertilizer to be applied on pole tomato (lycopersicon esculentum mill) on yield and quality in TokatKazova conditions with fertigation method.

Oruç E, Gürler AZ. 1995. A research on supply and usage of chemical fertilizers in Tokat City Kazova District. Gaziosmanpaşa University Agriculture Faculty Journal, 12:56- 68. Available from: http://ziraatdergi.gop.edu.tr/Makaleler/ 1604298533_56-68.pdf [Accessed: 22.02.2017 ].

Oktem MO, Biçer Y. 1996. KHGM, APK Head of Department Soil and Water Resources Research Branch Office, Soil and Water Research Summaries, (1958-1995), Ankara.

Rehber E. 1989. Usage of cultivation functions in economic analysis of fertilizer tests. MPM Productivity Journal, 165-192, Ankara.

Sefa S, Oruç S, Gürün B. 1996. KHGM, APK Head of Department Soil and Water Resources Research Branch Office, Soil and Water Research Summaries (1958-1995), Ankara.

Silva EC-DA, Alvarenga MAR, Carvalho JG-DE. 1997. Yield and blossom-end rot of the tomato plant (Lycopersicon esculentum Mill) pruned and grown under high planting density under the influence of nitrogen and potassium fertilization. Ciencia-eAgrotecnologia., 21: 3, 324-333.

Şahin S, Karaman MR, Ünlükara A, Geboloğlu N, Durukan A. 2011. Determination of suitable nitrogen dosage and plant water consumption with fertigation method in pole tomato cultivation at Tokat Kazova Province. Ege University Agriculture Faculty Journal, Special volume, 81-87, Available from: http://www.zfdergi.ege.edu.tr/edergiziraat/ozel_sayi1/kongrekitap14.03.2011.pdf [Accessed: 22.02.2017 ].