. Agri-news. Agriculture. April 16,2001 So/7 conservation for dryland - the 1000 pound rule Soil erosion on dryland will be a greater concern over the next year because of last summer's drought. Low crop yields have reduced the amount of crop residue to critical levels on many fields and conservation practices are needed to protect remaining residue. "Wind or water erosion is a greater risk whenever the soil cover drops below 1000 lbs per acre, depending on soil ty pe and field situation," says Don Wcntz, soil salinity specialist with Alberta Agriculture, Food and Rural Development,
. Agri-news. Agriculture. April 16,2001 So/7 conservation for dryland - the 1000 pound rule Soil erosion on dryland will be a greater concern over the next year because of last summer's drought. Low crop yields have reduced the amount of crop residue to critical levels on many fields and conservation practices are needed to protect remaining residue. "Wind or water erosion is a greater risk whenever the soil cover drops below 1000 lbs per acre, depending on soil ty pe and field situation," says Don Wcntz, soil salinity specialist with Alberta Agriculture, Food and Rural Development, Lethbridge. "Soil conservation practices, such as strip cropping, re-cropping and permanent cover, are used extensively on dryland to reduce soil degradation on highly erodible soil ; An average wheat crop produces about 80 lbs of residue per bushel of harvested grain. This ratio may not work when moisture conditions are on the extreme high or low end. For example, during drought conditions, some wheat crops will produce a lot of straw but run out of moisture for grain. "Last year's wheat grown on stubble may have only yielded 10 bushels per acre, but residue production looks to be over 1000 lbs for most fields," continues Rob Dunn, cereal and oilseed specialist with Alberta Agriculture, Lethbridge. "Wheat on fallow yielded about 25 bushels per acre with residue levels estimated at 2000 to 2500 lbs. Barley will have similar amounts with canola and mustard less because of lower yields. Pulse crops are worse yet because of poor yields and lower residue produced per bushel of harvested grain. Cereal and oilseed crops have the added advantage of standing stubble that is more effective at trapping snow and preventing erosion compared to ; The residue produced by last year's crop is aided by any carryover from previous year that could vary from a little to a lot, depending on the rotation and tillage practices. Chemical fallow or direct seed
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