Radiation regime and nitrogen supply in modelled alley cropping systems of Erythrina poeppigiana with sequential maize-bean cultivation
A simulation study relating the effect of the spatial arrangement of trees on the photon exposure above an associated cro (PEi) was carried out for an alley cropping system of the leguminous tree Erythrina poeppigina (Walpers) O.F. Cook with sequential maize-bean cultivation. These results were combined with the nitrogen supply from different tree densities to rank the arrangements. A significant difference was found in the PEi between the east - west and north - south oriented alleys. The latter presented more areas of moderate shade, while in the E - W orientation the alleys were divided between unshaded centres and heavily shaded parts next to the tree row. When the simulated PEi data was combined with the N supply of trees, the tree spacings of 1 x 6, 2 x 6, 1 x 8 and 2 x 8 m appeared to be best. In general, to minimize the shading, yet maintain a reasonable supply of organic matter and nitrogen, alley cropping tree arrangements of high between row and close within row spacings seem to be most promising. The E - W orientation seems to be more promising than N - S.
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
Turrialba (Costa Rica)
1991
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| Subjects: | CULTIVO EN FAJAS, ARBOLES Y CULTIVOS ANUALES, SIMULACION, NITROGENO, ZEA MAYS, PHASEOLUS, ERYTHRINA POEPPIGIANA, |
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| Summary: | A simulation study relating the effect of the spatial arrangement of trees on the photon exposure above an associated cro (PEi) was carried out for an alley cropping system of the leguminous tree Erythrina poeppigina (Walpers) O.F. Cook with sequential maize-bean cultivation. These results were combined with the nitrogen supply from different tree densities to rank the arrangements. A significant difference was found in the PEi between the east - west and north - south oriented alleys. The latter presented more areas of moderate shade, while in the E - W orientation the alleys were divided between unshaded centres and heavily shaded parts next to the tree row. When the simulated PEi data was combined with the N supply of trees, the tree spacings of 1 x 6, 2 x 6, 1 x 8 and 2 x 8 m appeared to be best. In general, to minimize the shading, yet maintain a reasonable supply of organic matter and nitrogen, alley cropping tree arrangements of high between row and close within row spacings seem to be most promising. The E - W orientation seems to be more promising than N - S. |
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