Crop yield and tree-leaf production in three planting patterns of temperate-zone alley cropping in Oregon, USA |
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Authors: | S Seiter R D William D E Hibbs |
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Institution: | (1) Department of Horticulture, Oregon State University, Corvalis, OR, USA;(2) Department of Forest Science, Oregon State University, Corvalis, OR, USA |
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Abstract: | The objective of this study was to determine crop and tree productivity in several alley cropping planting patterns. The four-
year study was conducted in western Oregon, United States and involved irrigated sweet corn (Zea mays) intercropped between
hedgerows of red alder (Alnus rubra) and black locust (Robina pseudoacacia). Three alley cropping planting patterns with variable
plant populations and tree-crop proximity were tested with each tree species in a randomized block design. Space available
to trees and crops determined yield of both plant components. High crop yield coincided with low pruning yield, and vice versa.
Compared to monocropping, yield reductions in traditional alley cropping planting patterns with widely spaced, double tree
rows ranged from 5% to 15%. A. rubra and R. pseudoacacia coppiced readily and produced 0.9 to 4.7 tons of dry matter pruning
biomass per growing season, depending on planting pattern and year. A. rubra yield continually increased during the trial,
while the ability of R. pseudoacacia to produce green manure after frequent coppicing appeared to weaken. After four years,
soil organic matter was 4 to 7% higher in the topsoil of an alley cropping system compared to a monocropping system. However,
continuous growing of sweet corn resulted in decreased soil organic matter levels in both cropping systems compared to original
levels. Crop yield reductions and the need for additional management inputs constrain the implementation of alley cropping
in temperate climates. Only if benefits other than minor soil fertility improvements are realized is alley cropping a feasible
alternative in temperate climate regions.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | A nus rubra hedgerow intercropping Robina pseudoacacia Zea mays |
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