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.
Many soils in the United States and Canada show a paucity of available calcium even though the pH reading seems satisfactory. A high pH does not necessarily indicate adequate calcium in the soil.
How spreading aglime in far larger amounts than conventional ag science calls for greatly reduces the need for fertilizer and grows crops with much higher nutrient-density.
This is the story of how Tiedjens purchased an exhausted Ohio farm and proceeded to rehabilitate it, mostly with aglime.