Abstract

Anion exchange membranes (AEMs) have recently become available and have proven effective in measuring phosphorus present in soils as well as nitrate (NO3 ‐) under both cultivated and grassland field conditions. We have attempted to assess the ability of AEM strips to measure NO3 ‐ present under a perennial grassland harvested for hay three times during the growing season. In all cases, we found significant quadratic relationships between nitrogen (N) applied and NO3 ‐ desorbed from the AEM strips. Using both linear‐response‐and‐plateau (LRP) and quadratic‐plateau (QP) models, we found highly significant relationships to relative yield and the ability to predict a critical level (CL) of NO3 ‐‐N necessary to reach maximum yield during two harvest periods. The AEM strips provided a good correlation between NO3 ‐and N rate, and between NC3 ‐ and yield. Critical levels at which subsequent N would need to be applied in order to achieve maximum yield were identified. These need to be further field‐tested for consistency under differing environmental conditions.

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