Experimental Designs for Alley Cropping to Estimate Shrub x Grass Interaction
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Murari Singh. (4/2/2017). Experimental Designs for Alley Cropping to Estimate Shrub x Grass Interaction. Beirut, Lebanon: International Center for Agricultural Research in the Dry Areas (ICARDA).
Abstract
Alley cropping, an agroforestry system, comprises rows of perennial shrubs or trees bordering
the alleys of grasses/crops. An appropriately chosen alley cropping provides improvement in
feeds for small ruminants, food for human consumption, and contributes to economic and
environmental sustainability. Rangeland and forage development studies aim at evaluation of
interference of shrubs such as saltbush Atriplex, with the grasses or fodder/forage crops such as
vetch/barley. In such studies a number purposely selected species of shrubs and grasses are
evaluated under an alley cropping. This presentation discusses a number of experimental designs
and statistical models for analysis of responses on the grasses/crops in the alleys. The
experimental designs considered are the complete block with or without split-plot frames for the
border and alley experimental units. The treatment designs include a factorial structure of shrub
borders and grasses. The shrub-borders considered are of self-types, i.e. same shrub on both sides
of the alley, and partial diallel-type, i.e., different shrubs on the borders. The linear models
consisting of shrubs effects, grasses effects and their interaction with different structures are
considered with parameters defined for shrub × grass interaction. A statistical analysis of the
alley- responses has been illustrated with a simulated dataset.
Key words: Alley cropping, Shrub and Grass Effects and Interaction, Self and Diallel Designs, Blocks, Split-plots.
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Singh, Murari https://orcid.org/0000-0001-5450-0949