Weighing it, weigh how much a bucket is first on the weighing machine (best to get one with one to two decimal places)
Fill the bucket with fertilizer of your choice, see how much more the bucket of fertilizer weighs compared to the bucket (the difference between the bucket and the bucket of fertilizer is the weight of the fertilizer on its own)
Then give or take until you get 2 grams
Although 2 grams is barely anything so you probably don't need the bucket (scales would probably work)
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