Effects of Irrigation Water Salinity and Humic Acid Treatments on Caraway Plants

Abstract

The present study was carried out during two successive seasons of 2016/2017 and 2017/2018 at the Nursery of Ornamental plants, Fac. of Agric., Minia University, to study effects of saline water irrigation (250, 1000, 1750 and 2500 ppm) as the main plot and humic acid (control, 100, 200 and 400 mg/l.) as the sub plot and the interaction between them on vegetative growth traits (plant height, number of branches and herb dry weight/plant), fruit and essential oil productivity, as well as, some chemical composition (photosynthetic pigments, nitrogen, phosphorus, potassium, sodium, calcium and proline percentages) of caraway. Under irrigation with saline water ranged from 1000 and 1750 ppm, all studied vegetative growth characters were significantly increased such as fruit yield/plant, oil % and oil yield/plant and some chemical composition (photosynthetic pigments, N, P and K %). Also, humic acid treatments increased all studied parameters but decreased proline %. From results of this research it could be concluded that, caraway plants are moderately tolerant to salinity stress and can be vigorously grown under irrigation with saline water ranged from 1000 to 2500 ppm when sprayed with humic acid at 400 mg/l.

Response of Chia Seed Plants to Some Growth Stimulants and their Effects on Growth, Yield and Oil content.

“…Humic acid caused an increase in activity of root growth parameters such as auxins, which in turn is reflected in the improvement of growth of plant during all stages, and leaf pigments (Hassan, 2019;Karimian et al, 2019;Abou El-Ghait et al, 2021;Prasanna et al, 2021a and b;Massoud et al 2022 andMirzapour et al 2022). The increase in the leaf content of total chlorophyll, which is a biochemical characteristic, is due to the role of humic acid in increasing the permeability of the cell wall of root cells and increasing the absorption of elements such as magnesium, which play an important role in the construction of the chlorophyll molecule (Mohammed et al1982) The significant increase in most of vegetative traits such as plant height, leaf weight, vegetative growth and root weight may be due to the important role of humic acid in improving soil texture, facilitating the availability of nutrients to the plant and increasing the soil's ability to retain water (Fliessbach et al 2000).…”

“…Improvement plant growth in response to humic acid application appears not only to be related to the nutrient content of humic acid directly but also to interactions of humic acid with plant membrane transporters responsible for nutrient uptake and membrane associated signal transduction cascades which regulate growth and development (Canellas et al 2015). Many author's investigate the role of humic acid on medicinal plants (Jamali et al ( 97 ) 2015), (Mahsa et al 2015), (Taghipour et al 2017), (Hassan 2019), (Karimian et al 2019) Therefore, the aim of this study was to evaluate the effect of humic acid and vitamin E treatments on growth and productivity of chia plants.…”