Allelopathic Activity of Spearmint (Mentha spicata L.) and Peppermint (Mentha × piperita L.) Reduces Yield, Growth, and Photosynthetic Rate in a Succeeding Crop of Maize (Zea mays L.)

Abstract

The inclusion of species with allelopathic activity in crop rotation systems may have benefits for crop management such as weed control, but less is understood about their wider impacts on succeeding crops. The main objective of this study was to investigate the effects of two allelopathic species (spearmint and peppermint) on growth, physiological characteristics, and yield of a following maize crop. Thus, field experiments were carried out at two sites, according to a randomized complete block design, while the examined treatments were: (a) fallow–fallow–maize crop rotation system (FFM), (b) spearmint–spearmint–maize crop rotation system (SSM), and (c) peppermint–peppermint–maize crop rotation system (PPM). Our results indicated that the inclusion of spearmint or peppermint in crop rotation systems negatively affect the growth of maize plants. The highest plant height was recorded for FFM rotation system where no allelopathic species were used. At both sites and for four sampling dates, the aboveground dry biomass was also affected by the implemented crop rotation system. In particular, dry biomass was significantly lower in the PPM and SSM crop rotation systems comparing to the FFM system, whereas there were no significant differences between these two crop rotation systems. Similar to the maize biomass, the highest values of photosynthetic rate, stomatal conductance, and relative chlorophyll content were observed for the FFM rotation system. Additionally, differences in grain yield were observed among the tested crop rotation systems. Grain yield ranged from 10,200 to 13,346 kg ha−1 and from 11,773 to 14,106 kg ha−1 at site A and B, respectively, while it was reduced by 16.54–23.58% and 12.16–17.83% in the SSP and PPM rotation systems comparing to the FFM system. In conclusion, our results indicate that the inclusion of peppermint or spearmint in crop rotation may inhibit plant growth and reduce grain yield of maize as successive crop, an effect that could be attributed to the allelopathic activity of spearmint and peppermint.

Methods of preparing aqueous extract and bioactivity of Mentha spicata L. on Raphanus sativus L. seeds

“…(2015) demonstrated that exudates from some aromatic plants, including species of the genus Mentha, presented antagonist substances that reduced in 84% the survival rate of lettuce seedlings, indicating allelopathic action. Karkanis et al (2019) observed reduction in the photosynthetic rate, stomatal conductance, height and dry mass of sweet corn plants and yield, when sowed in succession to Mentha spicata L. and Mentha x piperita L..Those authors ascribed this effect to the allelopathic activity of the plants used in the crop rotation and called attention to the importance of knowing the interaction between plant species to obtain greater efficiency from the rotation system.…”

“…Mairesse et al (2007) and Parreiras et al (2011) reported the spearmint extract negative effect on the germination of lettuce seeds (Lactuca sativa L.). Karkanis et al (2019) identified that the cultivation of two spearmint cycles reduced chlorophyll content, photosynthetic rate, growth, dry biomass and yield of sweetcorn grains (Zea mays L.) planted subsequently.…”

The Impacts of Woolly Cupgrass on the Antioxidative System and Growth of a Maize Hybrid

“…In agreement, Farooq et al [ 25 ] showed that the allelopathic effect of tobacco leads to the reduction of chlorophyll-a, -b content in maize and mung bean. Furthermore, the relative-chlorophyll content (SPAD unit) was inhibited by the allelopathic effect of spearmint ( Mentha spicata L.) in maize [ 26 ]. In contrast, the chlorophyll content was not reduced by the allelopathic effect of Tithonia diversifolia in the maize leaf [ 27 ].…”

Johnsongrass (Sorghum halepense (L.) Pers.) Interference, Control and Recovery under Different Management Practices and its Effects on the Grain Yield and Quality of Maize Crop

“…Ten plants were randomly harvested to quantify ear length and grain yield. After harvest, 1000 grain-weight was measured by weighing three random 100-grain samples from each treatment [20]. Protein and starch content were determined in the dry grains by near-infrared reflectance (NIR) spectroscopy technique using the DA 7250 NIR analyzer (Perten Instruments, Hägersten, Sweden).…”