Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2006
Sammendrag
Environment Synthesis) family of crop models predicts cereal growth, development, and yield. CERES simulates nitrogen (N) as a yield"limiting macronutrient. Because N leaching is an economic and environmental concern, this study evaluated if CERES can be used to predict N leaching under different N management scenarios: background leaching in unfertilized corn (Zea mays L.), alfalfa (Medicago sativa L.) residue mineralization, and till versus no"till management. Data were collected during a 7"yr field experiment on tillage practices in a maize"alfalfa"maize succession. Sensitivity analyses were performed for decomposition rates of the different residue pools and the relative proportions of carbohydrate, cellulose, and lignin in the residues. During the last 5 yr, under corn, CERES accurately simulated nitrate leaching from the no"till lysimeters. Nitrate leaching was underestimated in the tillage treatments, possibly because CERES does not simulate tillage. The model is not very sensitive to the decomposition rates and to the composition of the residues
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Svein Solberg Erik Næsset Ole Martin BollandsåsSammendrag
Det er ikke registrert sammendrag
Sammendrag
In this study, we present a new method for single tree segmentation and characterization from a canopy surface model (CSM), and its corresponding point cloud, based on airborne laser scanning. The method comprises new algorithms for controlling the shape of crown segments, and for residual adjustment of the canopy surface model (CSM). We present a new criterion that measures the success of locating trees, and demonstrate how this criterion can be used for optimizing the degree of CSM smoothing. From the adjusted CSM segments, we derived tree height and crown diameter, and based on all first laser pulse measurements within the segments we derived crown-base height. The method was applied and validated in a Norway spruce dominated forest reserve having a heterogeneous structure. The number of trees automatically detected varied with social status of the trees, from 93 percent of the dominant trees to 19 percent of the suppressed trees. The RMSE values for tree height, crown diameter, and crown-base height were around 1.2 m, 1.1 m, and 3.5 m, respectively. The method overestimated crown diameter (0.8 m) and crown base height (3.0 m).
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Jan NetlandSammendrag
Det er ikke registrert sammendrag
Forfattere
Jan NetlandSammendrag
Det er ikke registrert sammendrag
Forfattere
Jan NetlandSammendrag
Denne presentasjonen gir ein oversikt over ugrasmiddel som er godkjente i dei ulike grønsakskulturane i Noreg, der det er gitt tidsavgrensa dispensasjonar og der det kan ligga til rette for bruk, enten ved dispensasjon eller off-label godkjenning. Stomp som enno ikkje er godkjent, men utprøvd i mange kulturar, blir også trekt inn i oversikten.
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Venche TalgøSammendrag
Det er ikke registrert sammendrag