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Singh then experimented on a vast number of species, such as com mon asters, petunias, cosmos, and white spider lilies, along with such economic plants as onions, sesame, radishes, sweet potatoes, and tapioca. Each of these species Singh entertained for several weeks just before sunrise with more than half a dozen separate ragas, one per experiment, played on the flute, violin, harmonium, and veena; the music lasted a half hour daily, scaled at a high pitch, with frequencies between one hundred and six hundred cycles per second. From all this experimentation Singh was able to state, in the magazine of the Bihar Agricultural College at Sabour, that he had "proven beyond any shadow of doubt that harmonic sound waves affect the growth, flowering, fruiting, and seed-yields of plants.
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Peter Tompkins (The Secret Life of Plants: A Fascinating Account of the Physical, Emotional and Spiritual Relations Between Plants and Man)