Influence of Potassium Humate on Am Contamination and Rhizospheric Mycoflora of Rice (Oryza sativa L)

Abstract

An experiment was conducted in Institute of Plant Pathology, University of the Punjab, Lahore, to assess the effect of different concentrations of Potassium humate (0, 250, 500, 750 and 1000 mg per Kg) on rhizospheric mycoflora of Basmati Rice (Oryza sativa L.) in field experiment. In this regard different parameters of Arbuscular Mycorrhizal infection (%age infection, number of arbuscules, number and size of vesicles, length of mycelium), number of mycorrhizal spores and percentage occurrence of soil borne pathogenic and antagonistic fungi was recorded in the rhizospheric soil of rice. The data calculated for the study of mycoflora did not exhibit any significant different in the AM colonization in roots, number of rhizospheric mycorrhizal spores and percentage occurrence of many fungi. Only Aspergullus terreus, Rhizopus spp. and Aspergillus petrakii show significant difference in their percentage occurence in different treatments. Rhizopus spp. decreases with the increase in the concentration of potassium humate while Aspergillus petrakii and Aspergullus terreus increased with the increase in potassium humate concentration.

Keywords: Oryza sativa L., rice, Potassium humate, Humic acid concentrations, Arbuscular mycorrhiza, fungi.