Abstract
The variability of soil pH, texture and organic matter was studied with the prospects of varying application rate of lime by precision farming techniques. Soil pH varied greatly across the uniformly managed field at the farm of University of Newcastle, England. Soil samples were taken on a regular grid of 20m x 40m using differential Global Positioning System (DGPS). The spatial analysis showed that the range was large, resulting in maps having a uniform pH. The large areas of uniform pH would allow differential application of liming material. A uniform application of lime, based on an average pH for the entire field was shown to be less effective than spatially targeted applications. Only 9% of the field was at the mean pH 5.9 (±0.1), which would be limed using the conventional approach, required no liming. 35 % of the total area required >0.5 tlha more than the recommended rate and 56% require
