Fig. 3. Soil water content in the 180 cm soil profile during the 6-yr (1993–1999) study period at the beginning of each fallow cycle in early August, in early spring after over-winter soil recharge had occurred, and at the end of the fallow cycle in early September as affected by conventional, minimum, and delayed minimum tillage. Means for each sampling date followed by a different letter are significantly different at P < 0.05. Numbers above bars show storage efficiency (SE), i.e., the percentage of precipitation occurring during the fallow cycle which was stored in the soil. NS = nonsignificant.