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Correlation Between NaHCO₃-extractable P and Response to P Fertilization in Pot Tests¹

Pot tests were used to estimate potential fertility of major Syrian soils. Soil samples were collected from 270 sites throughout Syria.

The relative increase in dry weight yield of wheat (Triticum vulgare L.) seedlings due to the addition of P was calculated. The response of soils to addition of P varied widely among soil groups, depending upon the parent material, degree of weathering, age of the soils, and other factors.

The degree of response to P fertilization by the pot test method was calibrated with the response in 20 field tests giving a correlation coefficient of r = 0.81.

The NaHCO₃-extractable P in soils studied in pot tests was correlated with the relative increase in wheat yield due to the addition of P fertilizers to soils. The correlation coefficient was poor, when all soils were considered as one group, with r = –0.03. Correlation was improved when the soils were grouped according to its genetic origin, into four major groups. Correlation coefficients (r) between the NaHCO₃-extractable P and the yield response to P addition were: –0.69, –0.87, –0.89, and –0.64 for basaltic, Euphrates Valley, Khabour Valley, and limestone soils, respectively.

It was concluded that the pot technique used was satisfactory to estimate the potential fertility of soils and that estimation of the available P in soils by the NaHCO₃ method is adequate for soils of diverse genetic origin.

Key Words: Phosphate response coefficient (Rp) • Potential fertility • Great soil groups

² Associate professor of soil science and former research associate, respectively.

Received for publication April 4, 1974.