Tiedjens, Victor A. and L.G. Schermerhorn
Original publisher: New Jersey Agricultural Experiment Station
Publication status: Public domain
Observations made on vegetable farms in New Jersey located on sandy soils, show that pH is not always a reliable indicator of the available calcium and that many of those sandy soils which have pH values of 6.0 to 6.6, where large applications of soda and potash have been made, may be very deficient in calcium and magnesium.