Influence of the Application of Zeolite and Nitrogen on Quality, Yield and Yield Components of Potato under Field Condition

For evaluation of the effect of different levels of zeolite and nitrogen on yield and some quality traits of potato under field condition, an experiment was carried out as a split plot based on a randomized complete blocks design in three replications in research fields of University of Kurdistan in 2018. The experimental treatments were clinoptilolite zeolite application at four levels (0, 5, 10 and 15 ton ha-1) as the main plot and nitrogen application at five levels (0, 50, 100 150 and 200 kg N ha-1) as the sub plot. The results indicated that with the application of different levels of zeolite, tuber yield, biological yield, average tuber weight, tuber dry matter, significantly increased, while, tuber NO3- concentration significantly decreased. Also, the results indicated that the nitrogen application led to significant increase in the tuber yield, biological yield, average tuber weight, tuber dry matter and NO3- concentration. The greatest tuber yield was recorded at 200 kg ha-1 N application treatment.  The highest tuber yield and harvest index were recorded at 10 ton ha-1 zeolite application treatment. The tuber yield in this treatment was 13.9% higher than the control treatments (no zeolite application). In general, the results of this study demonstrated that the zeolite application at 10 ton ha-1 can be a suitable practice for improving potato yield and quality.