Effects of spatial arrangement and density on efficiency, yield and yield components, dry matter partitioning and growth of an annual cotton/cowpea/maize intercrop.

Persistent Link:
http://hdl.handle.net/10150/186205
Title:
Effects of spatial arrangement and density on efficiency, yield and yield components, dry matter partitioning and growth of an annual cotton/cowpea/maize intercrop.
Author:
Neto, Francisco Bezerra.
Issue Date:
1993
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The effects of spatial arrangement and density on agronomic efficiency, yield and yield components, dry matter partitioning and growth of an annual cotton/cowpea/maize intercrop were examined in 1990 and 1991 in Tucson, Arizona. The 1990 experiment consisted of four spatial arrangements crossed with four densities of cowpea and maize in a complete factorial design. The 1991 experiment consisted of two densities of cowpea and maize selected from the 1990 experiment in the best spatial arrangement crossed with five densities of cotton in a complete factorial design. A land use efficiency of 12% (or a land equivalent ratio of 1.12) was obtained in the spatial arrangement of single rows of cowpea and maize between singles rows of cotton, whereas a land use efficiency of 11% was obtained for cowpea and maize at a combined density of 50,000 plants/ha intercropped with cotton at a density of 50,000 plants/ha. Maize provided a greater contribution to the land use efficiency than either cotton or cowpea. Cotton yield was highest in the spatial arrangement of single rows of cowpea and maize between single rows of cotton. For the two food crops, cowpea yield was highest in the spatial arrangements in which cowpea and maize were grown in different rows between rows of cotton, whereas maize yield was highest in the spatial arrangements in which cowpea and maize were grown in the same rows between rows of cotton. Cotton fiber quality was not influenced by spatial arrangement, cowpea/maize density, and cotton density. Number of cowpea pods was affected by spatial arrangement in a manner similar to cowpea yield. Number of maize ears increased as cowpea/maize density increased, whereas number of kernels/ear, weight of 100 kernels and length of kernel rows decreased as cowpea/maize density increased. Dry matter accumulation in leaves, stems, and fruits of cotton and cowpea was greatest in the spatial arrangements in which cowpea and maize were grown in different rows between rows of cotton. Weekly cotton growth rate increased as cotton density increased from 39 to 74 days after sowing.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Dissertations, Academic.; Plant ecology.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Plant Sciences; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Robichaux, Robert H.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleEffects of spatial arrangement and density on efficiency, yield and yield components, dry matter partitioning and growth of an annual cotton/cowpea/maize intercrop.en_US
dc.creatorNeto, Francisco Bezerra.en_US
dc.contributor.authorNeto, Francisco Bezerra.en_US
dc.date.issued1993en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractThe effects of spatial arrangement and density on agronomic efficiency, yield and yield components, dry matter partitioning and growth of an annual cotton/cowpea/maize intercrop were examined in 1990 and 1991 in Tucson, Arizona. The 1990 experiment consisted of four spatial arrangements crossed with four densities of cowpea and maize in a complete factorial design. The 1991 experiment consisted of two densities of cowpea and maize selected from the 1990 experiment in the best spatial arrangement crossed with five densities of cotton in a complete factorial design. A land use efficiency of 12% (or a land equivalent ratio of 1.12) was obtained in the spatial arrangement of single rows of cowpea and maize between singles rows of cotton, whereas a land use efficiency of 11% was obtained for cowpea and maize at a combined density of 50,000 plants/ha intercropped with cotton at a density of 50,000 plants/ha. Maize provided a greater contribution to the land use efficiency than either cotton or cowpea. Cotton yield was highest in the spatial arrangement of single rows of cowpea and maize between single rows of cotton. For the two food crops, cowpea yield was highest in the spatial arrangements in which cowpea and maize were grown in different rows between rows of cotton, whereas maize yield was highest in the spatial arrangements in which cowpea and maize were grown in the same rows between rows of cotton. Cotton fiber quality was not influenced by spatial arrangement, cowpea/maize density, and cotton density. Number of cowpea pods was affected by spatial arrangement in a manner similar to cowpea yield. Number of maize ears increased as cowpea/maize density increased, whereas number of kernels/ear, weight of 100 kernels and length of kernel rows decreased as cowpea/maize density increased. Dry matter accumulation in leaves, stems, and fruits of cotton and cowpea was greatest in the spatial arrangements in which cowpea and maize were grown in different rows between rows of cotton. Weekly cotton growth rate increased as cotton density increased from 39 to 74 days after sowing.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectDissertations, Academic.en_US
dc.subjectPlant ecology.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplinePlant Sciencesen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairRobichaux, Robert H.en_US
dc.contributor.committeememberTaylor, B. Brooksen_US
dc.contributor.committeememberOttman, Michael J.en_US
dc.contributor.committeememberFfolliott, Peter F.en_US
dc.contributor.committeememberLopes, Vicente L.en_US
dc.identifier.proquest9322704en_US
dc.identifier.oclc715462235en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.