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Predicting Soil pH and Buffer pH In Situ with a Real-Time Sensor

Dep. of Agron., 2004 Throckmorton Hall, Kansas State Univ., Manhattan, KS 66506

View larger version (34K): [in this window] [in a new window]   Fig. 1. Two fields sampled by mobile sensor platform (MSP) and lab measurements of pH and buffer pH. Sample locations are represented by () for MSP measurements and () for soil core (lab) sample locations. Ogden is on the left and Ashland is on the right. The lower figures represent soil pH as interpolated with inverse distance weighting, P = 1, n = 8.

View larger version (24K): [in this window] [in a new window]   Fig. 2. Lab pH as function of mobile sensor platform (MSP) pH at two locations near Manhattan, KS, and the combined data set for both locations.

View larger version (18K): [in this window] [in a new window]   Fig. 3. Lab buffer pH as a function of mobile sensor platform (MSP) pH at two locations near Manhattan, KS, and the combined dataset from both locations.

View larger version (24K): [in this window] [in a new window]   Fig. 4. (A) Buffer pH and soil pH from soil samples collected from two fields near Manhattan, KS, and the combined dataset. (B) Buffer pH predicted from mobile sensor platform (MSP) pH and the relationships in (A).