Alfalfa response to elevated atmospheric CO2 varies with the symbiotic rhizobial strain |
| |
Authors: | Annick Bertrand Danielle Prévost Francine J Bigras Roger Lalande Gaëtan F Tremblay Yves Castonguay Gilles Bélanger |
| |
Institution: | (1) Department of Agroecology, Danish Institute of Agricultural Sciences, P.O. Box 50, DK-8830 Tjele, Denmark |
| |
Abstract: | An estimation of the residual nitrogen effects of animal manure is important when optimizing crop rotations and fertiliser
applications. The residual effect of animal manure was studied with the dynamic simulation model FASSET. The model was tested
on experiments with 15N-labelled animal manures, where the fate of labelled manure N had been studied. Three field experiments differing in animal
manure type, the labelled fraction of the manure, soil type and application techniques were analysed. The duration of the
experiments varied between one and three years. In general, the model simulations agreed well with the observations. At the
end of the experimental periods, the model captured 74% of the observed variation in soil 15N, whereas some systematic difference was found between measured and simulated plant uptake of 15N. The model was used to evaluate the impact of soil types, soil fertility, manure type, climate and crop type on the 15N residual effect of animal manure. These scenarios showed that wet climates, sandy soils and crops with a short growing season
reduce the residual effects of animal manures. The type of the manure also influenced the residual effect of the manure such
that the residual effect increased from pig slurry and cattle slurry to deep litter. The soil organic matter level had little
influence on the 15N residual effect of the manure. |
| |
Keywords: | 15N labelled manure Animal manure Dynamic modelling Residual 15N Soil organic matter Spring barley |
本文献已被 SpringerLink 等数据库收录! |
|