. Crop production risks in the Canadian prairie region in relation to climate and land Grain; Oilseed plants; Crops and climate; Crops and soils; Cultures de plein champ; Cultures et climat. 126 primarily to ensure that the suitability for wheat was less than or equal to that for oats and barley, and that potential yields were greater or equal to actual yields (in the few instances where actual yields exceeded the calculated potential yields, potential yield was set equal to actual yield). 4- -i ii. mECHETX¥L. HRK ¥ {> J is? k y /) 1 y o •X Xj -si W R2 A fey"" FJ vi :v
. Crop production risks in the Canadian prairie region in relation to climate and land Grain; Oilseed plants; Crops and climate; Crops and soils; Cultures de plein champ; Cultures et climat. 126 primarily to ensure that the suitability for wheat was less than or equal to that for oats and barley, and that potential yields were greater or equal to actual yields (in the few instances where actual yields exceeded the calculated potential yields, potential yield was set equal to actual yield). 4- -i ii. mECHETX¥L. HRK ¥ {> J is? k y /) 1 y o •X Xj -si W R2 A fey"" FJ vi :v -v $ :x ;> Esi&a Me en l_oa~n>' Sat~icdx BFaOVWM DK GR CHERNOZEMIC SOILS Figure Physical land flexibility ratios (PLFr) for Chernozemic soils in the prairie region. Values for PLFr were calculated for each map unit in the prairie region according to equation (5). The data (Table , Fig. , Fig. ) show that the theoretical upper limit for physical land flexibility for cereals is exceeded in sandy soils in all cases, and in loamy soils in the Brown Chernozemic soil area (Fig. ). This could be because potential yields in these areas are underestimated, and/or because the amount of land under cultivation is greater than that estimated to be suitable. Whatever the reason, this indicates that these soils are likely being used beyond their capability, and thus are more subject to degradation (other conditions being equal). Production pressures on these soils should be reduced if they are to be maintained in a sustainable manner. In the drier areas this might involve land retirement to permanent forages, whereas in other regions increased use of forage rotations as well as land retirement would be appropriate. Conversion to summerfallow, however, should be avoided. In general the potential land flexibility of the Black Chernozemic soils is the most under-utilized in the region (Table , Fig. ), followed by the Dark Gray Chernozemic and Dark Brown Chern
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