SPATIALLY-VARIABLE LIMING RATES - A METHOD FOR DETERMINATION

The variability of soil acidity and crop liming requirements in field in East Texas were examined. Sixty-eight soil samples were taken in a systematic manner from the field. Geostatistical techniques were used to analyze the soil acidity variability of the samples and assist in d eveloping a liming application rate map for the field. Soil pH, soil t exture, and buffer pH variations showed spatial dependence. Applicatio n of the average recommendation rate for the field would have resulted in an over application of lime in 9 to 12% of the field and an under application on 37 to 41% of the field. Varying lime application within the field so different areas,receive appropriate rates would have cau sed a greater total lime application of 8 to 28%, depending on recomme ndation method, compared to the mean application rate. The data indica ted the application of lime ''where needed'' could maximize applicatio n benefits.