...the same character in adjoining fields giving much smaller yields. The conclusion logically follows that on the average farm the great controlling factor...the exact nature of which is yet to be determined. It is not to be deduced from this that fertilizers do not frequently increase the yield of crops, but...

...of soil, or to some physiological or physical effect is not altogether clear." The authors conclude "that on the average farm the great controlling factor in the yield of crope is not the amount of plant food in the soil, but is a physical factor the exact nature of which...

...soil solution, which latter is the immediate source from which plants feed. From this it was concluded that on the average farm the great controlling factor in the yield (but not necessarily the quality) of crop is not the amount of plant food present, but a physical factor,...

...the same character in adjoining fields giving much smaller yields. The conclusion logically follows that on the average farm the great controlling factor...the exact nature of which is yet to be determined, (p. 63) The first review of the bulletin appeared in September 1903 in the Scientific American (Anonymous...

...soil and the yield of crops." . . . "The conclusion logically follows that on the average farm tht, great controlling factor in the yield of crops is not the amount of plant food in the soil." . . . "It appears further that practically (theoretically) all soils contain sufficient plant food...

...soil solution, which latter is the immediate source from which plants feed. From this it was concluded that on the average farm the great controlling factor in the yield (but not neces sariíy the quality) of crop is not the amount of plant food present, but a physical...