Spatial variability of available nutrients in soil in nearly level fields in northeastern Saskatchewan
A long-term bromegrass (Bromus inermis Leyss) experiment was initiated in 1968 on a thin Black Chernozemic (Typic Boroll) soil at Crossfield, Alberta, Canada. Data was collected on dry matter yield (DMY), total precipitation (TP) and mean maximum daily temperature (MMDT) over 23 years. The results showed that TP and MMDT for May, June and July fluctuated in the range of 116.0-258.2 mm and 18.4-21.8°C from 1968 to 1990. The DMY during this period ranged from 0.54 to 2.80 Mg ha-1 in the zero-N treatment, and from 2.93 to 10.06 Mg ha-1 with application of 112 kg N ha-1. The regression analysis of data indicated that DMY increased with increase in precipitation, and decreased with rise in temperature. Application of N intensified response of DMY to the changes in precipitation and temperature during the growing season.
Soils and Crops Workshop