Volume 70 Number 4 Article 6 Pages: 216-223
Year 2016 Month 10
Title: Drought and Biostimulant Impacts on important Attributes of Perennial Ryegrass for Orchard and Vineyard Floor in the Intermountain West Region of the United States
Authors: Shahla Mahdavi and Esmaeil Fallahi
Water shortage is a critical issue worldwide, mandating the use of efficient irrigation systems (i.e. drip and
micro-jet) in modern orchards and vineyards to irrigate only the target trees and vines.
Therefore, this issue
may adversely impact orchard floor vegetation, which is needed to prevent tractor traffic compaction.
impact of two levels of evapotranspiration-based (ETc) water stresses and biostimulants consisting of abscisic
acid (s-ABA), Glycine betaine (GB), digoxin, nano silica and some of their combined applications on perennial
ryegrass (Lolium perenne, L.) under climatic and soil conditions of the Intermountain West, USA were studied.
Comparing two levels of irrigation, grass clippings with 50% ETc had higher electrolyte leakage and proline but
lower visual performance, chlorophyll index (CI) and chlorophyll b than those with 75% ETc.
With the exception
to the digoxin at 0.5 mg.L-1, clippings from all biostimulant-treated plots had significantly better visual performance
and higher CI, proline, chlorophyll a and b and potassium (K) concentration than those from the un-treated
These results underscore the value of these biostimulants for improving the orchard and vineyard floor
grass covers under drought stress conditions that prevail in the western United States.
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