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Mycorrhizal infection, nutrients uptake, and quality of ryegrass under humic acid treatments

Nikbakht, A., M. Pessarakli, N. Daneshvar and M. Kafi. 2014. Mycorrhizal infection, nutrients uptake, and quality of ryegrass under humic acid treatments. Agronomy Journal. 106: 585-595

Arbuscular  mycorrhizal  (AM)  symbiosis  confers  numerous  bene ts  to  host  plants,  including  improved  plant  growth  and nutrient acquisition e  ciency. An experiment was conducted to evaluate the e ect of AM fungi (Glomus intraradices and G. mosseae) in the presence of humic acid (HA) spray treatments (0, 100, 400, and 1000 mgL–1) on nutrient (N, P, K, Fe, and Zn) uptake, visual quality and chlorophyll content, root growth and architecture, and colonization of perennial ryegrass (Lolium perenne L.) Speedygreen mixture.   e results revealed that HA did not a ect plant growth signi cantly; instead arbuscular mycorrhizal fungal (AMF) colonization improved dry and fresh weights. Mycorrhizal inoculations signi cantly increased visual quality (13 and 15% in inoculated plants compared to non-inoculated ones) that might be at least partly due to elevated total chlorophyll content.   e AM inoculation and HA treatment resulted in improved root architecture rather than root biomass production. Neither HA treatments nor mycorrhizal inoculation a ected N and Fe contents of the leaves; however P, K, and Zn concentrations improved by AM inoculation. More roots were colonized by G. intraradices than by G. mosseae.   ese results suggest that AM inoculation is bene cial in enhancing uptake of some nutrients and root development of ryegrass possibly leading to less fertilizer input and more drought resistance.

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