University of Tabriz Journal of Agricultural Science and Sustainable Production 2476-4310 35 3 2025 10 22 Interaction of humic acid and biological phosphorus on the yield of pinto bean (Phaseolus vulgaris L.) in deficit irrigation conditions Interaction of humic acid and biological phosphorus on the yield of pinto bean (Phaseolus vulgaris L.) in deficit irrigation conditions 43 61 20581 10.22034/saps.2024.60328.3173 FA Neda Hossinzadeh Department of Plant Production and Genetics, Faculty of Agriculture, Urmia University, Urmia, Iran. Alireza Pirzad Department of Plant Production and Genetics, Urmia University, Urmia, Iran Journal Article 2024 01 29 Background and Objectsive: Nowadays, due to environmental considerations and water deficit, the use of humic acid along with phosphate-solubilizing bacteria (through various mechanisms including the production of siderophores and increased phosphorus uptake by plants) leads to a significant improvement in the physical, chemical, and biological properties of the soil, and increases the yield of crops. This research was done, in order to investigate the effect of drought stress and some fertilizer sources, including biofertilizer and humic acid, on some morphological and physiological characteristics of pinto beans under drought stress conditions. Materials and Methods: A factorial experiment was carried out based on randomized complete block design with two factors and three replications in the Aghblag region (38º 21' 31" N latitude, 47º 39' 53" E longitude). The first factor was irrigation in two levels of full irrigation (100% of field capacity; FC) and deficit irrigation (70% FC), and the second factor was different sources of fertilizers in 6 levels (chemical P(150 kg/ha), biological P (100 g/ha Phosphate Barvar2), 50% chemical P+biological P, chemical P+humic acid (10 l/ ha), biological P+humic acid, 50% chemical P+biological P+humic acid). Results: According to the results, the seficit irrigation led to a decrease in plant height, stem diameter, number of leaves and leaf weight, while the fertilizer treatment, especially 50% chemical P+biological P+humic acid caused to increase in plant height, number of leaves, number of seeds and 100-seed weight. Seed protein increased in the treatments with chemical and biological fertilizers at the same time (by 19% with humic acid and 12% without humic acid) compared to the control. In general, with the combination of bio-fertilizer and humic acid, and using half of the chemical fertilizer, the highest seed yield (19.54 g/plant) was obtained in deficit irrigation. Conclusion: Therefore, to maintain the quality and yield of pinto bean at 70% FC, the half of chemical P+biological P+humic acid is recommended. Background and Objectsive: Nowadays, due to environmental considerations and water deficit, the use of humic acid along with phosphate-solubilizing bacteria (through various mechanisms including the production of siderophores and increased phosphorus uptake by plants) leads to a significant improvement in the physical, chemical, and biological properties of the soil, and increases the yield of crops. This research was done, in order to investigate the effect of drought stress and some fertilizer sources, including biofertilizer and humic acid, on some morphological and physiological characteristics of pinto beans under drought stress conditions. Materials and Methods: A factorial experiment was carried out based on randomized complete block design with two factors and three replications in the Aghblag region (38º 21' 31" N latitude, 47º 39' 53" E longitude). The first factor was irrigation in two levels of full irrigation (100% of field capacity; FC) and deficit irrigation (70% FC), and the second factor was different sources of fertilizers in 6 levels (chemical P(150 kg/ha), biological P (100 g/ha Phosphate Barvar2), 50% chemical P+biological P, chemical P+humic acid (10 l/ ha), biological P+humic acid, 50% chemical P+biological P+humic acid). Results: According to the results, the seficit irrigation led to a decrease in plant height, stem diameter, number of leaves and leaf weight, while the fertilizer treatment, especially 50% chemical P+biological P+humic acid caused to increase in plant height, number of leaves, number of seeds and 100-seed weight. Seed protein increased in the treatments with chemical and biological fertilizers at the same time (by 19% with humic acid and 12% without humic acid) compared to the control. In general, with the combination of bio-fertilizer and humic acid, and using half of the chemical fertilizer, the highest seed yield (19.54 g/plant) was obtained in deficit irrigation. Conclusion: Therefore, to maintain the quality and yield of pinto bean at 70% FC, the half of chemical P+biological P+humic acid is recommended.

https://sustainagriculture.tabrizu.ac.ir/article_20581_d706a957093573653e945fa6b188f21e.pdf