Valencia fruit sizes increased: Calcium acid phosphate found effective in outdoor cultures of pure silica sand and nutrient solution

The Valencia fruit size problem has interrelationships of various factors, and to learn how certain ones operate–when as many as possible of the usual complicating factors are removed–a series of experiments were set up using pure silica sand and nutrient solution. This type of experimental approach makes it possible to synthesize some of the actual orchard nutritional conditions in certain areas where large sizes of fruit often predominate.