Foliar application of humic acid and iron and zinc nano chelates alleviate the salinity damage on chicory (Cichorium intybus L.) in hydroponic culture

Document Type : Original Article

Authors

1 Department of Horticulture science, Karaj branch, Islamic Azad University, Karaj, Iran.

2 Department of Agronomy and plant breeding, Karaj branch, Islamic Azad University, Karaj, Iran.

3 Professors of Department of Agronomy and Plant Breeding, Karaj branch, Islamic Azad University, Karaj, Iran.

Abstract

Chicory has a rich nutritional composition and is a rich source of proteins, vitamins and minerals. Salinity stress can affect its growth and quality to some extent and it is very important to provide the solution to deal with it. For this intention, a factorial experiment was administered in the form of a completely randomized design in three replications on chicory (Cichorium intybus L) in Karaj, Iran, in September 2022. The treatments consisted humic acid [0 (control), 500, 1000 mg l-1], micronutrient [0 (control), iron nano chelate and zinc nano chelate], and salinity stress [without stress (control), 30 mM NaCl]. The results confirmed that salinity stress decreased the yield of chicory. Increasing the concentration of humic acid and also the usage of micronutrients increased the yield and qualitative yield of the plants. Humic acid and micronutrients diminished the negative effects of salinity stress. The highest plant yield (679.54 g m-2) was related to interaction of humic acid 1000 mg l-1 + iron without salinity stress, and also was observed in humic acid 1000 mg l-1+ zinc spraying (681.15 g m-2). The lowest value of this index (335.97 g l-1) was observed in salinity conditions and control. Salinity stress had the greatest proline content (0.328 mg g FW-1), and the lowest proline content (0.088 mg gFW-1) was seen in humic acid 1000 mg l-1 + iron. Therefore, for improving plant yield and resistance to salt stress, humic acid and micronutrient spraying were recommended.

Keywords

References

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