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li -,4 ) 3 771 77 7-7 <br /> 7-1 -77 <br /> 77-1 7-71 <br /> ml diluted reagent NH4-N abs NH4-N Organic N <br /> Sampling Sampling Sampling used manure blank total (total- ppm ppm <br /> manure- (NH4 abs x (manure abs <br /> ®ate time location in test absorb. absorb. absorb. reagent) 300) x 22001 notes <br /> s <br /> r <br />