EFFECT OF DIFFERENT LEVELS OF POTASSIUM FERTILIZER ON RHIZOCTONIA STEM ROT OF POTATO CAUSED BY RHIZOCTONIA SOLANI KUHN

	EFFECT OF DIFFERENT LEVELS OF POTASSIUM FERTILIZER ON RHIZOCTONIA STEM ROT OF POTATO CAUSED BY RHIZOCTONIA SOLANI KUHN
journal of kerbala university
Article 1, Volume 2, Issue 4, 2006, Pages 24-30 PDF (0 K)
Abstract
Results of field survey for potato stem rot disease caused from R. Solani Kuhn in different regions from Potato fields of Ninavah province during May in 2000 showed that the disease was spread in all studied regions, the percentage of the disease ranged between ( 6-35% ) . Results of using several levels of potassium fertilizer has caused significant decrease in disease incidence and severity, in case of increasing potassium level from first level ( 0 ) to fourth level ( 60 mg K / kg soil ), disease incidence and severity decreased from ( 90 to 55% ) and ( 0.93 to 0.79 ) respectively for Ajax variety and (90to85%) and (0.95 to 0.20) respectively for Marfona variety. Results indicated a positive effect of fertilization levels on the increment of some studied characteristics such as length of plant, number and weight of tubers. Also the results indicated increase in concentration of Nitrogen, Phosphorus and Potassium elements in shoots with the increase of Potash fertilization in polluted and non polluted soils with R. Solani

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