The disparities in the GGRs between bold and small grains were significantly higher in all the three segments.
Table 1: Grain growth rates (GGRs) of individual grains (mg [day.sup.-1]) at different locations in an ear of wheat (Triticum aestivum L.) in three different varieties from 7th to 14th DAA (mean of ten replications).
GGR (mg [day.sup.-1]) = [W.sub.2] - [W.sub.1]/[T.sub.2] - [T.sub.1]
Unlike conventional magnetic, electromagnetic, gravity, and seismic techniques that measure physical rock properties (often in response to induced effects), and that may detect variations from source depths of tens to thousands of metres, AGRS and GGRS measure variations in radioactivity emanating from the top 0.30 m of the Earth's surface.
(1995, 1997) present a number of case histories that demonstrate the use of AGRS and GGRS to map potassium alteration associated with different styles of mineralization, including volcanogenic massive sulphides, polymetallic, magmatic-hydrothermal (Au-Co-Cu-Bi-W-As (Olympic Dam-type)), and porphyry Cu-Au-(Mo) deposits.