CORRELATION OF MICROBIOLOGICAL AND CHEMICAL SOIL DATA WITH CROP YIELDS OF THE JORDAN SOIL FERTILITY PLOTS

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Abstract
Highly significant correlations beyond the 1% level were found to exist between crop yields and microbiological activity of the 36 Jordan plot soils as measured by the cellulose decomposing power and nitrifying capacity. Total soil N and organic carbon, each a measure of residual soil organic matter, showed highly significant correlations with crop yields beyond the 1% level. The correlation coeffs. obtained were comparable with those secured for microbiological activity. Readily available P and NO3-N (1935 sample) showed significant correlations with crop yields beyond the 1% level. No significant correlations were found to exist between crop yields and exchangeable K and inorganic water soluble salts.

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