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Lethbridge Herald Newspaper Archives

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Lethbridge Herald, The (Newspaper) - July 24, 1973, Lethbridge, Alberta -Tuesday, July 24, 1973 THE tETHBRIDGE HERALD Toxic effects of rapeseed prompts tests By DR. J. L NEAL SoU Microbioleslst Research Station With the increasing number of acres being sown to rape- seed, concern has been ex- pressed by many agronomists about the phytotoxic properties of raoeseed residue and its ef- fect upon successive cereal crops Lille is known about the toxic effect of rapessed residue on sml microbes. Experiments have been conducted at the Leltbridse Research Station to study this effect, particularly on t'-ose microbes that are re- la'ed to soil fertility. Analysis Ammonia nitrogen is con- ve-ted to nitrate nitrogen in the sod by microbes and in roost soil analysis laboratories it is the amount of nitrate nitrogen that is meatured as an indicator of nitrogen fertil- izer requirements. If the conversion to nitrate has bean inhibited, soil tests would indicate a requirement for nitrogen, which would re- sult in an overestimation of its need and could be costlj to the gro er The results of our studies in- dicate that the leachate of rapes csd residue and the ma- terial exuded from roots rapeseed depress the rate at which microbes convert am- monia nitrogen to nitrate nitro- gen However, this effect is only temporary and disappears within two to three weeks. The rate of microbial oxida- tion of ammonia nitrogen to nitrate nitrogen then proceeds at the normal rapid rats. Peri- odic additions of rapeseed resi- due and exudates from rape- seed roots in the laboratory to soil for a period of six months caused a depressive, but al- ways temporary, effect upon the transformation of ammonia nitrogen to nitrate nitrogen, indicating that the inhibitory does not accumulate in the soil. Short period Unlike the phytotoxic ma- terial associated with rapeseed residue which affects the of subsequent cereals, the substances found in rape- seed that affect the microbial conversion of ammonia to ni- trate nitrogen persists in the soil for only a short period of time before being inactivated by other soil microbes. Therefore, there is no need to be concerned that the growing of rapeseed will affect this im- portant soil microbial trans- formation nor that it will af- fect the soil nitrate nitrogen analyses upon which nitrogen fertilization requirements are based. U.S. WHEAT The total 1972 U.S. wheat crop is well short of prospec- tive demand Production is forecast at l 5 billion bushels, down six per cent from last year's record HJ billion bush- els. SQUEEZE CHUTE This has an automatic head gate for easy one-man operation. No way animal can chake down. Sides of squeeze are low enough to allow easy rib er shoulder branding on calves and high enough to handle larger canto. This ideal t.'ieeze chute eliminates need far caff table. Comes right or left, portable or stationary, side opening or frent release. All units are heavy duty by comparison. rr -4 .4. Available at all Southern Alberta Co-op Stores GERRY'S TRADING POST. FORT MACLEOD VERN ARNOLD, FOREMOST and at the plant CUNT'S EQUIPMENT, CARDSTON CLINT'S EQUIPMENT LIMITED "MADE IN CANADA BY CANADIANS" CARDSTON, Alberta Phone 653-3534 Comparison WESTINGHOUSE TWIN TUB WASHER DRYER Its compact size makes it the ideal laundry for the apart- ment or cottage. Lets you do the wash right in the kitchen Gets the job done thoroughly. 14 Ib capacity and permanent press settings. 6 WESTINGHOUSE REFRIGERATOR Westinghouse value prices 13.8 cu. ft. of frost free stor- age in a cabinet. The 3.5 cu. ft. freezer holds up to 124 Ibs Attractive handles with wood ac cents and trim panels. Avail- able colors: avocado, gold and white. 339 WESTINGHOUSE FREEZER Westinghouse 23 cu ft chest freezer. Glass fibre insulated non sweat cabinet. 5 year food spoilage warranty. 1 year warranty on freezer plus additional 4 years on refrig erating system .Handy lift out basket. Seal Tite lid. 219 CASH AND CARRY SMITH'S FOR C Wo- J (J 236 13th St. N. CLOSED MONDAYS Phone 328-5541 OPEN THURS. AMD FRI. Till 9 ;