Farmers in Southern California are adding plant food to irrigation water. Ammonia gas in the water has proved as nourishing as nitrogen fertiliser.
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https://paperspast.natlib.govt.nz/newspapers/DOM19350201.2.119
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Dominion, Volume 28, Issue 109, 1 February 1935, Page 12
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23Untitled Dominion, Volume 28, Issue 109, 1 February 1935, Page 12
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