Abstract
Introduction: Water and nitrogen deficits are the most important limiting factors for plant growth and crop production in the world. Drought stress would be amplified by the global warming. Moreover, nitrogen scarcity is occurred in most arid and semi-arid areas. Cumin (Cuminum cyminum L.) is an important plant due to export benefits and low water demand. This study was aimed to evaluate nitrogen fertilizer effect on yield and some physiological characteristics of cumin under different irrigation regimens. Methods: The experiment was performed based on a split plot as randomized complete block design. Experiment treatments were irrigation regimens (field capacity, irrigation by draining 40% of soil water as middle stress, and irrigation by draining 80% of soil water as severe stress) and nitrogen fertilizers (60 kg ha-1 urea, 30 kg ha-1 urea, Nitroxin, and Nitroxin + 30 kg ha-1 urea). Results: Drought stress reduced cumin dry weight, seed yield, and chlorophyll content. In contrary, proline content, malondialdehyde (MDA) rate, phenol content, anthocyanin amount, and activity of catalase (CAT) and peroxidase (POX) increased by water stress. Increment urea use resulted in amending cumin growth and seed yield in the field capacity. Also, nitrogen use and raising its rate under the middle water stress caused to improve cumin drought tolerance. However, under the severe water stress, nitrogen application had not a significant impress on drought acclimation and seed yield. Conclusion: Nitroxin inoculation with use of 30 kg ha-1 urea was the most effective treatment to ameliorate seed yield and drought tolerance.
Highlights
Water and nitrogen deficits are the most important limiting factors for plant growth and crop production in the world
Nitroxin was comprised of a mixture of Azospirillum and Azotobacter strains with 108 CFU which purchased from Mehr Asia Biotechnology Company (MABCo) in Iran
Water deficiency reduced the plant dry weight so that water depletion to 40% and 80% from the field capacity reduced the dry weight to 19.3% and 42.7%, respectively, compared to the control
Summary
Water and nitrogen deficits are the most important limiting factors for plant growth and crop production in the world. Results: Drought stress reduced cumin dry weight, seed yield, and chlorophyll content. Nitrogen use and raising its rate under the middle water stress caused to improve cumin drought tolerance. Under the severe water stress, nitrogen application had not a significant impress on drought acclimation and seed yield. Evapotranspiration rate is enhanced by the global warming which caused to boost drought stress [2]. Drought is the most important limiting factor for plant growth and crop production over the world [5]. Drought is the major reason for reducing plant growth [7] and is gradually rising due Pishva et al to global warming subjects [8]. Plants could cope drought condition by osmolyte biosynthesis for adjust water potential, upregulation enzymatic and non-enzymatic antioxidants, hormone biosynthesis, etc [10]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
