FOLIAR DIAGNOSIS STUDY OF CLIMATIC INFUENCES ON THE NUTRITION OF SPRING AND FALL GROWN GREENHOUSE TOMATOES

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Abstract
The higher yield from a particular fertilizer treatment in the spring compared with that from the same plot in the fall was associated with a lower intensity of nutrition and a lower value for the quota part of N and P2O5 in the NPK-unit (N[long dash]P2O5[long dash]K2O equilibrium) and a higher value for the quota part of K2O. The mechanism of the action of a particular fertilizer element in influencing yields in different (meteorological) years or seasons is deduced in terms of the established concepts of foliar diagnosis, and is applied in the present expt. to the examination of the effect of the meteorological conditions prevailing during the spring and fall seasons, respectively, on the role of N, P2O5 and K2O in the unfertilized soil.