Journal of Food, Agriculture and Environment

The effect of root zone temperature in low nitrogen level of nutrient solution in sweet pepper


Atena Sheibanirad, Maryam Haghighi

Recieved Date: 2021-08-16, Accepted Date: 2021-09-30


Root temperature in soilless culture influences plant growth, photosynthesis, and nutrient uptake. A factorial experiment based on a complete randomized design with five replicates investigated the effect of root zone temperature and nitrogen ratio on sweet pepper seedlings in soilless culture. Treatments include root zone temperature [15, 25 (optimum) and 35°C] and different nitrogen levels: 50, 75 and 100% (optimum) of N Johnson nutrient solution. Results showed that growth parameters including root fresh weight, shoot dry weight and root volume reduced more at 15°C with nitrogen level reduction by 27% compared with 35°C. Photosynthetic characteristics like photosynthetic rate, transpiration, mesophyll conductivity, and photosynthetic water use efficiency was not affected by nitrogen level at 25 and 35°C. Higher photosynthetic traits including greenness index, photosynthesis rate and mesophyll conductance were obtained with N 50% at 15°C. Shoot phenol increased by 55% at N 50% compared to N 100% at 35°C. Nitrate reductase activity was affected by heat stress and significantly decreased at 35°C. The phosphorus and potassium concentrations were reduced by nitrogen reduction at 35°C. Conclusively, a lower nitrogen level in nutrient solution can be used if the temperature of the nutrient solution decreased to 15°C in sweet pepper seedling.


 Growth parameters, hydroponic, photosynthesis, soilless culture, nitrate reductase, N metabolism

Journal: Journal of Food, Agriculture and Environment
Year: 2021
Volume: 19
Issue: 3&4
Category: Agriculture
Pages: 64-70

Full text for Subscribers

Note to users

The requested document is freely available only to subscribers / registered users with an online subscription to this Journal. If you have set up a personal subscription to this title please enter your user name and password ( All abstracts are available for free.

Article purchasing

If you like to purchase this specific document such as article, visit the site Software and compilation, Science & Technology, all rights reserved. Your use of this website details or service is governed by terms of use. Authors are invited to check from time to time news or information.

Purchase this Article:   20 Purchase PDF Order Reprints for 15

Share this article :