THE EFFECT ON THE GROWTH OF PEANUTS OF NUTRIENT DEFICIENCIES IN THE ROOT AND THE PEGGING ZONE

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Abstract
Peanuts were grown in nutrient solns., using a technique previously described for completely separating the rooting and fruiting zones. A complete nutrient soln. was applied to the roots for 89 days while the pegging zone received only water. At the end of this period nutrient differentiation was begun by applying various solns. to the root and pegging zones until harvest time, 51 days later. A max. of 17% of the total number of pegs produced fruit. A deficiency in the root zone even at this late date, of several of the major elements decreased the yield of fruit. There was no consistent relation between top growth and fruit production. Very few fruit developed without Ca in the pegging zone. Sulfate ion in the pegging zone increased the yield of peanuts. More radioactive P and Co entered the fruit through the roots than when the fruit was directly in the radioactive soln. A discussion of the relative importance of root and fruit absorption of nutrients is given.

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