Survey correlation between some soil physicochemical properties on the severity of tomato Fusarium wilt and yield in the Ramian region, Golestan province

Fusarium wilt disease of tomato is caused by Fusarium oxysporum f. sp. lycopersici is reported to cause great losses in tomato production globally, and is a limiting factor to tomato production in Ramian region, Golestan province. This experiment was conducted to evaluation of soil physicochemical properties impacts on tomato Fusarium wilt.

Soil samples of tomato fields were randomly selected in the Ramian region and the physical (pH, EC) and ochemical (organic matter, N, P, K) properties were measured by titration, flame photometry and spectrophotometry methods. Disease assessment (soil inoculum, external and internal scale) also recorded in different fields. For analyzing the association between disease assessments with soil physicochemical properties, a correlation analysis was used.

The results showed a low positive, but significant correlation between pH and soil inoculum. In return, the correlations between EC, N, P, K and organic matter and soil inoculums were not statistically significant. There was a significant correlation between EC, K and soil inoculums with external scale, also a positive and negative correlation observed between internal scale with soil inoculums and with K and P, respectively. The correlation between soil inoculum with yield of first, second and total harvest were not statistically significant, but anegative significant correlation observed between soil inoculum with yield of third harvest. The correlation of internal scale and yield of first harvest was also negative and significant.Conclution: The results showed the role of plat nutrition especially K in tomato fields for wilt disease cotrol.