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 Ozus, T. Articles by Hanway, J. J. Search for Related Content PubMed Articles by Ozus, T. Articles by Hanway, J. J. Agricola Articles by Ozus, T. Articles by Hanway, J. J.

Comparisons of Laboratory and Greenhouse Tests for Nitrogen and Phosphorus Availability in Soils¹

ABSTRACT

Greenhouse techniques were developed for estimating nutrient availability in soils which would provide standards for comparison of different chemical soil tests. Plants were grown on undried soil samples to which nothing except water was added, but where other nutrients were supplied to the plants. Plant growth and P contents were highly correlated with the results of a chemical soil test. Plant uptake of N during the early period of growth was highly correlated with the initial NO₃ content of the soils. Later plant uptake of N was highly correlated with the aerobic and anaerobic rates of N mineralization in the soils, but the relationships were different at different levels of P availability in the soils.

¹ Journal paper no. J-5181 of the Iowa Agr. & Home Econ. Exp. Sta., Ames, Iowa. Project 1190.

² Former graduate student (now at the Irrigation Research Institute, Tarsus, Turkey), and Professor of soils, respectively.

Received for publication July 27, 1965. Accepted for publication September 29, 1965.