Premium
Nitrogen‐supplying Power of Some Tropical Soils of Puerto Rico and Methods for its Evaluation 1
Author(s) -
Lathwell D. J.,
Dubey H. D.,
Fox R. H.
Publication year - 1972
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1972.00021962006400060017x
Subject(s) - oxisol , ultisol , soil water , nitrogen , incubation , cropping , environmental science , agronomy , greenhouse , extraction (chemistry) , chemistry , environmental chemistry , soil science , biology , ecology , agriculture , biochemistry , organic chemistry , chromatography
An evaluation of the N‐supplying power of 10 representative Oxisols and Ultisols of Puerto Rico was made by continuous cropping in the greenhouse. Four chemical extraction methods as well as aerobic incubation procedures were used to obtain an index of N availability in these soils. Nitrogen produced during incubation was highly correlated with N released to the crops. Nitrogen extracted by all of the chemical methods used, especially total N extracted by 0.01 M CaCl 2 solution and potassium sulfate, was highly correlated with N uptake by plants. These results showed that substantial quantities of N can be removed from these soils upon cropping. It was also shown that laboratory chemical methods as well as incubation procedures provide a reliable means for evaluating the N‐supplying power of these soils.