Dinitrogen Fixation by Seven Legume Crops in Alaska
Abstract Information on amounts of N 2 fixed by legumes in subarctic regions is lacking. We determined the N 2 ‐fixation potential of seven legume species under field conditions in subarctic Alaska. Seasonal N 2 fixation was estimated for alfalfa ( Medicago sativa L.), red clover ( Trifolium pratens...
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crwiley:10.2134/agronj1995.00021962008700010007x 2024-03-24T09:05:26+00:00 Dinitrogen Fixation by Seven Legume Crops in Alaska Sparrow, Stephen D. Cochran, Verlan L. Sparrow, Elena B. 1995 http://dx.doi.org/10.2134/agronj1995.00021962008700010007x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2134%2Fagronj1995.00021962008700010007x https://onlinelibrary.wiley.com/doi/pdf/10.2134/agronj1995.00021962008700010007x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Agronomy Journal volume 87, issue 1, page 34-41 ISSN 0002-1962 1435-0645 Agronomy and Crop Science journal-article 1995 crwiley https://doi.org/10.2134/agronj1995.00021962008700010007x 2024-02-28T02:17:03Z Abstract Information on amounts of N 2 fixed by legumes in subarctic regions is lacking. We determined the N 2 ‐fixation potential of seven legume species under field conditions in subarctic Alaska. Seasonal N 2 fixation was estimated for alfalfa ( Medicago sativa L.), red clover ( Trifolium pratense L.), yellow sweetclover ( Melilotus officinalis Lam.), fababean ( Vicia faba L.), lentil ( Lens culinaris Medik.), pea ( Pisum sativum L.), and white lupin ( Lupinus alba L.) on a neutral (pH 7.2) and an acid (pH 5.4) soil during two field seasons. A lime variable was included at the acid soil location. Dinitrogen fixation was estimated by the 15 N isotope dilution method and by the total‐plant N difference method. Three non–N 2 ‐fixing crops and uninoculated analogs at one location were used as reference crops. Agreement among reference crops and between methods of estimating N 2 fixation was adequate for most applications, but differences of >50 kg ha −1 were sometimes observed. Maximum N2 fixation estimates by the isotope dilution method were 58 kg ha −1 for alfalfa, 121 for red clover, 109 for sweetclover, 204 for fababean, 72 for lentil, 121 for pea, and 162 for white lupin. Liming usually did not significantly affect N 2 fixation. Nitrogenase activity, as measured by the acetylene reduction assay, peaked at or soon after flowering in some legumes; in others, it either plateaued or continued to increase after flowering until the end of the growing season. Article in Journal/Newspaper Subarctic Alaska Wiley Online Library Agronomy Journal 87 1 34 41 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
topic |
Agronomy and Crop Science |
spellingShingle |
Agronomy and Crop Science Sparrow, Stephen D. Cochran, Verlan L. Sparrow, Elena B. Dinitrogen Fixation by Seven Legume Crops in Alaska |
topic_facet |
Agronomy and Crop Science |
description |
Abstract Information on amounts of N 2 fixed by legumes in subarctic regions is lacking. We determined the N 2 ‐fixation potential of seven legume species under field conditions in subarctic Alaska. Seasonal N 2 fixation was estimated for alfalfa ( Medicago sativa L.), red clover ( Trifolium pratense L.), yellow sweetclover ( Melilotus officinalis Lam.), fababean ( Vicia faba L.), lentil ( Lens culinaris Medik.), pea ( Pisum sativum L.), and white lupin ( Lupinus alba L.) on a neutral (pH 7.2) and an acid (pH 5.4) soil during two field seasons. A lime variable was included at the acid soil location. Dinitrogen fixation was estimated by the 15 N isotope dilution method and by the total‐plant N difference method. Three non–N 2 ‐fixing crops and uninoculated analogs at one location were used as reference crops. Agreement among reference crops and between methods of estimating N 2 fixation was adequate for most applications, but differences of >50 kg ha −1 were sometimes observed. Maximum N2 fixation estimates by the isotope dilution method were 58 kg ha −1 for alfalfa, 121 for red clover, 109 for sweetclover, 204 for fababean, 72 for lentil, 121 for pea, and 162 for white lupin. Liming usually did not significantly affect N 2 fixation. Nitrogenase activity, as measured by the acetylene reduction assay, peaked at or soon after flowering in some legumes; in others, it either plateaued or continued to increase after flowering until the end of the growing season. |
format |
Article in Journal/Newspaper |
author |
Sparrow, Stephen D. Cochran, Verlan L. Sparrow, Elena B. |
author_facet |
Sparrow, Stephen D. Cochran, Verlan L. Sparrow, Elena B. |
author_sort |
Sparrow, Stephen D. |
title |
Dinitrogen Fixation by Seven Legume Crops in Alaska |
title_short |
Dinitrogen Fixation by Seven Legume Crops in Alaska |
title_full |
Dinitrogen Fixation by Seven Legume Crops in Alaska |
title_fullStr |
Dinitrogen Fixation by Seven Legume Crops in Alaska |
title_full_unstemmed |
Dinitrogen Fixation by Seven Legume Crops in Alaska |
title_sort |
dinitrogen fixation by seven legume crops in alaska |
publisher |
Wiley |
publishDate |
1995 |
url |
http://dx.doi.org/10.2134/agronj1995.00021962008700010007x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2134%2Fagronj1995.00021962008700010007x https://onlinelibrary.wiley.com/doi/pdf/10.2134/agronj1995.00021962008700010007x |
genre |
Subarctic Alaska |
genre_facet |
Subarctic Alaska |
op_source |
Agronomy Journal volume 87, issue 1, page 34-41 ISSN 0002-1962 1435-0645 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.2134/agronj1995.00021962008700010007x |
container_title |
Agronomy Journal |
container_volume |
87 |
container_issue |
1 |
container_start_page |
34 |
op_container_end_page |
41 |
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1794407164441264128 |