Effects of the rate and methods of placement of K-fertilizer in

پژوهشهای زراعی ایران

Article 16, Volume 5, Issue 2 - Serial Number 10, 2007, Pages 357-366   

Document Type: Research Article

DOI: 10.22067/gsc.v5i2.1142

Authors

M Mahloji^* ; A Shahabi; A Asady; A Jafary

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Abstract

In order to study the effects of potassium amounts and methods of potassium application in different systems of tillaging on barley cultivar of Karoon*Kavir grain yield in salinity stress conditions, a farm trail was conducted in a split block arrangement in three replications with a Randomized Complete Block Design at Roodasht salinity and drainage research station (Esfahan province) in 2003-5. Experimental treatments were soil tillage systems, potassium fertilizer amounts and its, placement methods. The main plots were soil till systems (conventional, minimum and no tillage).The horizontal treatments were recommended (300 kg/ha potassium sulfate), 33% lower and 33% higher than recommended amounts of potassium fertilizer. The vertical treatments in main plots were fertilizer placement methods (spreading and strip replacement of fertilizer 5 centimeter under the seeds). The water salinity of irrigation after spring growth stage was 12 ds/m. The conventional irrigation before spring growth stage is river water supply. The ANOVA results showed that: In the first year of study, the different soil till systems effected significantly(p = 0.01) plant height, number of spike per square meter, the concentration of minerals in leaf, grain yield, biological yield and harvest index. The fertilizer applications and its, placement effects on above-mentioned traits were not significant. The highest grain yield (3213 Kg/ha) obtained in conventional till. In the second year of experiment: soil tillage systems, the potassium fertilizer amounts and fertilizer placements had no significant effect on grain and biological yields of barley cultivar. The two-year study results showed that: The conventional till system is a suitable method for planting barley in soils with clay loam texture. In spite of higher amounts of potassium fertilizer application and higher amount of absorbable K+ in the soil, there were no significant effect on grain yield and its components.