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1963 fall fumigation 1963 spring fumigation 2-0 ponderosa Brozone 170 Brozone 340 Ib Chloropicrin CM CM CM CM fN Coeur d'Alene nursery d'Alene and Savenac Douglas-fir Dow Chemical effective fumigants effects of fumigation effects of soil Engelmann spruce fN fN fumigated and unfumigated fumigated seedbeds fumigated soils fumigation treatments fumigation trials gal./acre gallons per acre germinated grand fir growing season grown in fumigated growth hand weeding herbicides Ib./acre increases in seedling INTERMOUNTAIN FOREST lodgepole pine methyl bromide methyl bromide-based fumigants moisture stress nursery soils outplanted percent pesticides planting polyethylene ponderosa pine post-emergence mortality pounds per acre production Range Experiment Station resulted rH rH rH root Savenac nursery seed cost seedlings grown soil fumigation survival potential tOrH Trizone 140 Ib Trizone 200 Trizone at 200 unfumigated beds Vapam 40 weed control weed densities weeds per square western larch western white pine