EFFECT OF DROUTH ON THE NUTRIENT LEVELS IN THE TOMATO PLANT

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Abstract
Tomato plants were grown on greenhouse benches in which soil moisture was kept close to the wilting point in one section and close to optimum moisture in another section. The expt. was duplicated on a rich black elay soil and on an infertile red clay. Conducting-tissue tests on the enlarged portions of lower leaf petioles showed a greatly increased nitrate N content, a lowered phosphate content, and an increase in K on the dry soils in both soil types. This agreed with previous pot tests. The data present very consistent proof of the value of conducting-tissue tests in detecting the ability of different soils in supplying nutrients to the plant.