Effects of Silicon and Humic Acid on Some Physiological Responses in Bell Pepper at Different Salinity Levels

Document Type : Research Paper

Authors

1 PhD candidate, Department of Soil Science, School of Agriculture, Shiraz University, Shiraz, Iran

2 faculty member

3 Department of Soil Science, Shiraz University, Shiraz, Iran

4 Assistant Professor, Department of Horticulture Science, School of Agriculture, Shiraz University, Shiraz, Iran

Abstract

Salinity stress is one of the most critical causes restricting plant growth and development in arid and semi-arid regions. It is possible to use strategies to prevent plant yield loss in these areas. One of these strategies is the use of growth stimulants. The purpose of this study was to look into the influence of humic acid and silicon consumption on bell pepper growth under different salinity levels. This experiment was carried out in the research greenhouse of the School of Agriculture, Shiraz University, in 2019. Salinity treatment as saline water had conductivities of 0, 1.7, 3.4 and 5.1 dS.m-1 and were added to the plants during the growth, while humic acid, silicon, and the simultaneous application of these two were applied to reduce the effects of salinity. Humic acid was added twice, each time 0.5 grams per kilogram of soil, and silicon was applied as a foliar spray from a source of potassium silicate with a concentration of 1%. According to the results, level 5.1 dS.m-1 of salinity decreased 63% of shoot dry weight, compared to the control. Among the stimulant growth treatments, only humic acid showed a significant effect on increased plant biomass and caused 55% increase in the dry weight of shoots and roots. Salinity significantly increased the concentration of sodium, calcium, and magnesium in the plant, resulting in 750% sodium, 176% calcium, and 101% higher magnesium for 5.1 dS.m-1 level of salinity compared to the control. The findings of the treatments revealed that each treatment generated changes in several plant features, for example, the simultaneous application of humic acid and silicon caused 76% increase in sodium concentration in the plant, and humic acid treatments caused 28% decrease in root calcium concentration. According to the results of this research, humic acid improved more than silicon treatment, and the simultaneous application of humic acid and silicon could reduce the effects of salinity.

Keywords

Main Subjects

References

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Iranian Journal of Soil Research
Volume 38, Issue 2
October 2024
Pages 181-195

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