Journal of Food, Agriculture and Environment




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


Author(s):

Atena Sheibanirad, Maryam Haghighi

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

Abstract:

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.

Keywords:

 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


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