PJB-2019-332
EVALUATING THE ROLE OF MYCORRHIZA SPECIES IN PHOSPHORUS LEVELS ON PEPPERMINT PRODUCTION UNDER DIFFERENT WATER CONDITIONS
SOMAYYEH ESLAMI FARD
Abstract
Dehydration is one of the most important factors effecting growth and yield of medicinal plants, but studies have shown that application of fertilizers can have a positive effect in full irrigation and dehydration. The purpose of this study was to study the effects of irrigation levels (irrigation after 70, 110 and 150 mm evaporation from the pan), phosphate fertilizer levels (application of zero, 25 and 50% of the recommended phosphorus fertilizer) and manure fertilization treatments (control, application of Glomos mossae, G. intradices, G. hoei and application of a mixture of mycorrhizal species) on growth and essential oil yield of peppermint. This study was carried out as split split plot in a randomized complete block design with three replications at Tabriz, Iran Azad University. According to the results of this study, dehydration significantly reduced the growth and essential oil yield of the peppermint. Water deficiency reduced peppermint dry weight up to 51.7%, but Mixture of three species of mycorrhiza increased total dry weight by 36.9%. The dehydration in the second cut in the second year had no significant effect on the essential oil yield, but in first year, and first cut in second year of the investigation, treatment of irrigation after 150 mm evaporation from the pan decreased essential oil yield. In this study, application of three mycorrhiza species mixture was the most effective treatment in essential oil yield increment (by 38.19%). Application of 50% recommended phosphorus fertilizer increased the yield of essential oil by 18.87%. Finally, the results of this study showed that the application of a mixture of mycorrhizal species and the application of 50% phosphorus fertilizer can improve growth, essential oil yield and physiological characteristics in both conditions of irrigation and dehydration.
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