Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 509992
Title Robust increases of land equivalent ratio with temporal niche differentiation : A meta-quantile regression
Author(s) Yu, Yang; Makowski, David; Stomph, Tjeerd Jan; Werf, Wopke van der
Source Agronomy Journal 108 (2016)6. - ISSN 0002-1962 - p. 2269 - 2279.
DOI http://dx.doi.org/10.2134/agronj2016.03.0170
Department(s) Centre for Crop Systems Analysis
Crop Physiology
PE&RC
Crop and Weed Ecology
Publication type Refereed Article in a scientific journal
Publication year 2016
Abstract

Intercropping has been shown to be land use efficient, but there is a large variation in the land equivalent ratio (LER) among studies. We used quantile regression to estimate the effect of temporal niche differentiation and its interaction with other key characteristics of intercropping, i.e., crop type combination, N fertilizer, relative density, and intercropping pattern, using data from the intercropping literature. Quantile regression characterizes the entire distribution of the response metric by estimating quantiles of this distribution. This method gives a comprehensive characterization of the diversity of the response in the population. In this study, the effect of temporal niche differentiation on the LER was positive and significant across all quantiles (10, 15, …, 85, 90%). The response of the LER to temporal niche differentiation was similar in C3 –C3 and C3 –C4 intercrops except at low quantiles (below 20%), where a stronger response was found in C3 –C4 than in C3 –C3 intercrops. There was a negative effect of N fertilizer on the LER in the absence of temporal niche differentiation at all tested quantiles. At low LER (quantiles

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