- Arefe Chogan1, Mohammad Ali Aghajani2*, Hosein Ali Fallahi3
- Department of Agriculture, Damghan Branch, Islamic Azad University, Damghan, Iran
- Department of Plant Protection Research, Agricultural and Natural Resources Research Center of Golestan Province, Gorgan, Iran
- Agricultural Research Station for Gonbad-e Kavus, Agricultural and Natural Resources Research Center of Golestan Province, Gonbad-e Kavus, Iran
In order to have a crop loss assessment of various barely diseases in different genotypes and determine their resistance to different diseases, this research was performed in Gonbad-e Kavus Station of Agricultural Research, using 20 treats of different cultivars and lines of barley in the complete randomized block design with three replications.
Results of the simple regression analysis showed that there is a significant relationship (P≤ 0.01) between the total plot yield and the amount of net blotch, brown rust, brown blotch and strip blotch (in form of the disease final severity, AUDPC, SAUDPC), and that the relationship between other variables vary. Accordingly, in analyzing the crop loss in the yield resulting from the barley brown blotch, it is proved that the total plot yield reduces 75.06 kilograms per SAUDPC.
The results of the multiple regression for all of the diseases showed that there is a significant relationship (P≤0.01) for all models with the exception of the relationship between the number of seeds on each spike and the disease final severity and the relationship between the thousand kernel weight (TKW) and the AUDPC. Therefore, a high R-squared (R2) was observed in case of the relationship between the AUDPC and the yield, and the relationship between the SAUDPC and the yield, compared to other variables. This means that this model could present the 52.09% of changes in the total plot yield based on the AUDPC and SAUDPC of the diseases.
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