EFFECT OF MYCORRHIZAL INOCULATION AND POTASSIUM APPLICATION ON POTASSIUM RELEASE DURING GROWTH STAGES OF CORN (Zea mays L | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 17, Issue 1, December 2012, Pages 0-0 | ||
| Author | ||
| N. D. Salman | ||
| Abstract | ||
| A field experiment was conducted at the College of Agriculture, University of Baghdad in summer season of 2005 using silty clay loam soil, to study the effect of mycorrhizal inoculation on the release of fixed potassium and its availability to corn (Zea mays L.) plants using two levels of K and sampling at three growth stages (shooting, flowering and harvesting) (35,60,120 days after sawing) in a factorial experiment arranged according to RCBD with four replicates. Samples from soil and plants were collected at 35, 60 and 120 days after sawing for K determination. Results showed that the application of fungal Bio fertilizer led to increase of soluble and exchangeable potassium, these increases were reflected in K taken up by plants and on the dry matter production. Mycorrhiza inoculated treatment increased soluble-K in soil compared to non- inoculated ones with as increase of 56.14% and exchangeable K to increase was 55.94% too. The increase of available K (Soluble+ exchangeable) was 55.5% after inoculation. Increasing with time there was a decrease in soluble and exchangeable K, (available K) in a rate of 117.3% between the first and the last period. Results showed that diffusion equation the best of the used kinetic equations in describing the release of K in soil during growth stages of corn. The soil had a low release rate of K. The rate of potassium release increased with corn growth stages progress and the rate coefficient of K release values between 30.75-40.01 mg.Kg-1.hr -1/2. Kinetic parameters results showed that all equations have moderate to high providing ability. Cumulative released K that extracted by citric acid (5 x 10-4 M) was high and ranged 646.07-930.67 (mg.Kg-1) that equivalent to 1.65-2.38 Cmol K.Kg-1. Results showed high significant correlation between available K in soil and cumulative released K that extracted by citric acid (5 x 10-4 M) with the uptake of K by plant and yield throughout growth and production stages. It may be concluded that there are great importance of mycorrhizal inoculation or fungal biofertilizer in the release K under the conditions of this experiment. | ||
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