L Gholami, J Yasrebi, N.a Karimian, M Zarei, A Ronaghi,
Volume 5, Issue 4 (3-2015)
Abstract
A greenhouse experiment was conducted using corn to study the effect of arbuscular mycorrhiza, organic matter and zinc (Zn) on chemical forms of Zn in a calcareous soil. Experimental setup was factorial, based on completely randomized design with 3 replications. Treatments consisted of 3 levels of Zn (0, 5, and 10 mg Zn per kg soil), 2 kinds of organic manure (sheep manure and municipal waste compost, each at 0 or 1% w/w) and 2 levels of mycorrhiza (no inoculation and inoculation with Rhizophagus intraradices), which were added to a calcareous soil. Plants were harvested 8 weeks after emergence and the soil was used for fractionation of Zn by sequential extraction procedure. Roots were used to determine the degree of colonization. Results showed that inoculation with arbuscular mycorrhiza increased Zn bound to carbonate, organic matter and crystalline Fe-oxides but decreased the Zn bound to Mn-oxides, amorphous Fe-oxides and residual forms. All chemical forms of Zn (with the exception of soluble and exchangeable forms) increased with increasing application of Zn. Application of both kinds of organic manure increased chemical forms of Zn. Symbiosis of arbuscular mycorrhiza, organic matter and Zn increased corn plant-root mycorrhizal colonization
L. Gholami, J. Yasrebi, N. A. Karimian, M. Zarei, A. Ronaghi,
Volume 7, Issue 2 (8-2016)
Abstract
A greenhouse experiment was conducted to study the effect of zinc rates, arbuscular mycorrhiza and organic matter, on corn growth and micronutrients-uptake in a calcareous soil. Experimental design was factorial based on complete randomized design with 3 replications. Treatments consisted of 3 levels of Zn (0, 5 and 10 mg Zn/kg), 2 types of organic manure (sheep manure and municipal waste compost, each at 0 or 1% w/w) and 2 levels of mycorrhiza (no inoculation and inoculation with Glomus intraradices). Plants were harvested 8 weeks after emergence and used for chemical analysis. Roots were used to determine the degree of colonization. Results showed that application of Zn increased plant dry matter weight, total Zn and Cu uptake, root mycorrhizal colonization and decreased total Fe and Mn uptake. Arbuscular mycorrhiza increased plant dry matter weight, root mycorrhizal colonization and total Zn, Fe, Mn and Cu uptake. Application of both organic manures increased plant dry matter weight, root mycorrhizal colonization and total Zn, Fe, Mn and Cu uptake.
