[Effect of nitrogen and potassium nutrition on leaf spot disease of barley. I. Disease severity in relation to total phenol content of leaves]
1988
Jalal, T.K. | Sarhan, A.R.T. (J'a:mi3at s*ala:h Id-di:n, 'irbil (Iraq). Kism 3ulu:m al-h*aya:t)
This study was conducted to find out the effects of various levels of nitrogen (0, 70, 280, 420, and 630 ppm) and potassium (0, 75, 255, 430, and 710 ppm) on the leaf spot disease, caused by Helminthosporium sativum (Pamm. King and Bakke) of two barley cultivars, the "Black Local" and the imported "Arivat". Results obtained indicated that high levels of nitrogen (420 and 630 ppm) and potassium (430 and 710 ppm) decreased significantly the number of leaf spots caused by H. sativum on the cultivars. In addition, different treatments of nitrogen and potassium showed increased phenol contents in host tissues. Nitrogen at 420 and 630 ppm and potassium at 430 and 710 ppm significantly increased the phenol content of the host tissues. High nitrogen and potassium levels were positively correlated with the high phenol content and high level of resistance
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