| http://www.w3.org/ns/prov#value | - It turns out that 1000 to 1400 ppm is ideal for increasing production of tomatoes, cucumbers and lettuce by from 20% to 50%; grains such as rice, wheat, barley, oats, and rye by from 25% to 64%; roots such as potatoes, yams, and cassava by from 18% to 75%, and legumes such as peas, beans, and soybeans by 28% to 46%!
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