Interaction of humic acid and biological phosphorus on the yield of pinto bean (Phaseolus vulgaris L.) in deficit irrigation conditions

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Document Type : Research Paper

Authors

1 Department of Plant Production and Genetics, Faculty of Agriculture, Urmia University, Urmia, Iran.

2 Department of Plant Production and Genetics, Urmia University, Urmia, Iran

Abstract

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. A factorial experiment was carried out based on randomized complete block design with 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). 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. Therefore, to maintain the quality and yield of pinto bean at 70% FC, the half of chemical P+biological P+humic acid is recommended.

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JOURNAL OF AGRICULTURAL SCIENCE AND SUSTAINABLE PRODUCTION

Articles in Press, Accepted Manuscript
Available Online from 22 October 2025

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