Cheese whey, a dairy by-product with an estimated world production of 72 million tons, is a polluter to the environment if it is not treated before disposal. Among some practical and simple uses of whey is the use of it as a liquid fertilizer, which was the case in the pastures of USA and many other countries in the 1960s (Ryder, 1980). Since whey contains 50-55% of the dry matter of whole milk, it is rich in organic carbohydrate, fat, and some proteins and inorganic matter (mineral matter) and also in mostly lactic acid bacteria; 3 tons of whey equals 1 ton of animal fertilizer
Konar, Atilla and Arioglu, H. Halis
"Research Notes : Turkey : Effect of cheese whey as a fertilizer on the increase of soybean nodules,"
Soybean Genetics Newsletter: Vol. 14
, Article 32.
Available at: https://lib.dr.iastate.edu/soybeangenetics/vol14/iss1/32