HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Seatz, L. F. Articles by Sterges, A. J. Search for Related Content PubMed Articles by Seatz, L. F. Articles by Sterges, A. J. Agricola Articles by Seatz, L. F. Articles by Sterges, A. J.

Corn Response to Time and Rate of Phosphorus Applications¹

ABSTRACT

A greenhouse experiment was conducted to study the effects of rate and time of P applications on the growth and P uptake of corn. Different initial rates of P were applied and supplementary P was applied to make all treatments equal to the highest initial rate of 105 pounds P per acre. These supplementary applications were made to one set of each initial treatment at weekly intervals for 7 weeks after planting.

In most cases the yield was lower if the supplementary P was not applied within 4 weeks after planting. The higher the initial rate of P the longer the supplementary application could be delayed without yield reduction. In most instances the total P uptake was greatest when the supplemental P was applied 5 or more weeks after planting.

A critical period no doubt exists in the development of corn before which P must be available if it is to increase plant growth. If P becomes available after this critical period it will be absorbed by the plant and will be reflected in a higher percentage P composition.

¹ Contribution from the Department of Agronomy, Tennessee Agr. Exp. Sta., Knoxville.

² Professor and Assistant Professor of Agronomy, respectively.

Received for publication December 6, 1962. Accepted for publication December 14, 1962.