The effect of mycorrhiza and humic acid on chlorophyll content and grain filling components of wheat (Triticum aestivum L.) in various irrigation levels

In order to study the effect of mycorrhiza and humic acid on yield, chlorophyll content and grain filling components of wheat (Triticum aestivum L.) in various irrigation levels, a factorial experiment was conducted based on randomized complete block design with three replications in research farm of faculty of Agriculture and Natural Resources, University of Mohagheghi Ardabil in 2018-2019. Factors experiment were included irrigation at three levels (full irrigation as control, irrigation withholding at 50% of heading and irrigation withholding at 50% of booting stage), and application of mycorrhiza and humic acid at eight levels (Glomus intraradices, G.moseae, both application G. intraradices and G.moseae, humic acid, humic acid with G. intraradices, humic acid and G.moseae, humic acid with G.intraradices and G.moseae, control (without humic acid, G.moseae and G. intraradices). Means comparison showed that both application G.intraradices and G.moseae with humic acid under full irrigation increased anthocyanin content (71%), chlorophyll content a, b and total chlorophyll (10.8, 12 and 17%), grain filling rate (18%), grain filling period and effective grain filling period (7.6 and 8% respectively), ear length (48%), number of grain per ear (68%) and grain yield (48%) in comparison with irrigation withholding at 50% of booting stage and no application of mycorrhiza and humic. It seems that application of mycorrhiza and humic acid can increase grain yield of wheat under severe water limitation due to improving chlorophyll content and grain filling components.