Evaluation of a nitrogen availability test
- 1 June 1983
- journal article
- research article
- Published by Taylor & Francis in Communications in Soil Science and Plant Analysis
- Vol. 14 (5) , 427-433
- https://doi.org/10.1080/00103628309367376
Abstract
To evaluate a N availability test, we plotted corn (Zea mays L.) silage yields and N contents from several sites in Pennsylvania and Vermont against the total estimated available N (TEAN). Field N mineralization was estimated by using an empirical laboratory‐derived relationship between mineralized‐N (Nm) and the NH4‐N released by autoclaving (Ni). TEAN was calculated by summing estimated mineralized‐N of soil samples taken to 15 cm plus added inorganic‐N. By using a statistical procedure, we divided the data into two response populations with the critical value of 13.3 kg TEAN/ton maximum yield. Further field testing of the autoclaving N availability index is needed.Keywords
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