A soil test N (STN) is required to implement N fertilizer recommendations for vegetable crops in cultivated organic soils. A STN can be developed using the isometric log ratio (ILR) to balance soil C, N, and other soil components amalgamated into a filling value (Fv) and to derive a Mahalanobis distance () as STN. Our objective was to conduct a meta-analysis of multi-year and multi-site N trials on lettuce (Latuca sativa L.) response to added N along a gradient of values, and to develop an N recommendation model. Twenty-four N fertilization experiments were conducted from 2002 to 2006 in organic soils of southwestern Quebec. Each crop received four N rates from zero to 120-150 kg N ha-1 applied before seeding or in split applications. The relationship between N requirements by lettuce and STN was quadratic whether lettuce was seeded or planted. There were three STN fertility classes delineated by values of 1 and 5.5. The N recommendation model and its uncertainty were valuable for values up to 8.4. This approach provides a reliable test soil N to implement appropriate fertilizer recommendations for lettuce in organic soils.
How to translate text using browser tools
3 August 2016
Meta-analysis of lettuce (Lactuca sativa L.) response to added N in organic soils
Melissa Quinche Gonzalez,
Annie Pellerin,
Léon E. Parent
ACCESS THE FULL ARTICLE
It is not available for individual sale.
This article is only available to subscribers.
It is not available for individual sale.
It is not available for individual sale.
analyse compositionnelle de données
C/N ratio
compositional data analysis
laitue
lettuce
méta-analyse
meta-analysis