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Central University of Rajasthan (2021)

Assessment of climate scenarios and management practices on wheat production using DSSAT model in semi arid region of Rajasthan

Gunawat, Anshuman

Titre : Assessment of climate scenarios and management practices on wheat production using DSSAT model in semi arid region of Rajasthan

Auteur : Gunawat, Anshuman

Université de soutenance : Central University of Rajasthan

Grade : Doctor of Philosophy (PhD) in Environmental Science 2021

Résumé partiel
Simulation models, such as the DSSAT (Decision Support System for Agrotechnology Transfer) CERES models are often used to characterize, develop, and assess field crop production practices in the different climate scenarios of arid and semi-arid regions of the world. Understanding the linkage between crop yields, irrigation frequencies and fertilizer rates is very crucial issue in region specific agriculture practices. Wheat is the most widely grown crop at global level and major irrigation intensive staple crop in India and Rajasthan. This study is based on DSSAT-CERES model calibration, validation, and applicability for wheat crop in semi-arid regions of the western part of Rajasthan, India. Twelve treatments with four replicas, combining four nitrogen fertilizers quantities (0%, 50%, 100% and 125% of recommended dose) with three irrigation intervals (15, 21 and 25 days after sowing) were used for three consecutive years (2014-15, 2015-16 and 2016-17). Crop responses were recorded for the various growing stages (Tillering initiation-20 days, Booting initiation-40 days and Anthesis initiation-60 days). The obtained results showed that the high irrigation frequency and high fertilizer application significantly increased the crop growth and yields. The observed yield ranges between 3454.43 kg ha-1 to 4201.67 kg ha-1 in 2014-15, 2560.34 kg ha-1 to 4525.47 kg ha-1 in 2015-16 and 2826.31 kg ha-1 to 4013.86 kg ha-1 in 2016- 17 respectively among all treatments in three years. High yields are observed in first year of experiment as compared to second and third year in majority of treatments due to various factor like weather conditions, rainfall, soil quality, which affect the crop irrigation. The maximum value of three years average yield is found in treatment T5 (125 % urea of recommended dose and irrigation with 15 days interval)

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Page publiée le 24 janvier 2023