I found this story on Mrs. Daffodil Digresses here. The original source was the Auckland [NZ] Star, 16 April 1926: p. 3.
“A fantastic ‘Imperial secret’ that had its inception on a New York farm, and its conclusion in the courts of the Romanoffs, was told on March 14 in New York after twenty years of silence by Edward Hatch, a New York merchant, former member of the firm of Lord and Taylor.
“In 1903 a New York newspaper published an account of the lamentable state of affairs on the Hatch farm near Brewster, New York State. Hatch’s story runs:
“Eighty-five per cent of all the animals born there were males, said the paper. Bulls that might have sold for thousands of dollars went to the butchers because the market was flooded. All the chickens were roosters. Even the turkeys and carrier pigeons suffered from the hoodoo. The house had seven kittens, and six were toms.
“A hired man and his wife on the farm had five sons. Even the corn would grow only on stubs, and scientists said it was male corn.
“Soon after this story was published, Hatch now said, a stranger questioned him about it at his store. He wanted an explanation. Hatch said he thought it might be the water, which analysis had shown contained much phosphorus and magnesium. The stranger then introduced himself as the Russian Consul. He wanted a sample of the water, and Hatch agreed.
“A few days later the stranger appeared on the farm with two uniformed attendants to get a keg of the water. Hatch sought an explanation. The only answer he could get was ‘just an experiment.’
“A year later cable dispatches reported that a male heir had been born to the Imperial Russian throne. The preceding children of the Czar had been daughters.”