Research@Lincoln

Recent Submissions

  • ItemOpen Access
    Guide to subsurface land drainage
    (Lincoln College. New Zealand Agricultural Engineering Institute, 1988-05) New Zealand Agricultural Engineering Institute
    The NZAEI Guide to Subsurface Land Drainage is intended to be a readily available source of design information for farm advisors, contractors, farmers, and others involved in agricultural and horticultural drainage. The emphasis is on subsurface drainage because this is an area where the available information is often difficult to locate and can be confusing. The technical standards required in subsurface work are higher than for surface drainage, and mistakes are not only costly but also not easily rectified. This guide is not a comprehensive treatise on subsurface drainage, and for this kind of information on New Zealand conditions the reader is referred to Hudson, Hopewell, Bowler and Cross (1962), and Bowler (1980). It is presumed that the need for drainage has been established and that a suitably skilled drainage contractor is available. The information presented herein is an attempt to link these two. Drainage is by no means an exact science. Wherever possible, the physical reasons for particular recommendations are given so that the designer can make a judgement on the consequences of departing from the guidelines. In some drainage situations, local experience and practice may appear to conflict with methods presented in this guide. In such cases, proven successful practice must be allowed to reign with due regard for the physical reasons behind the apparent anomaly.
  • ItemOpen Access
    Application performance of travelling irrigators
    (Lincoln College. New Zealand Agricultural Engineering Institute, 1985-07) John, Peter H.; Lees, David M.; English, Grant M.
    The primary aims of this work were two-fold. Firstly, to evaluate the application performance of a cross-section of travelling irrigators available within New Zealand. The performance characteristics investigated were uniformity of application depth and the extent to which surface redistribution of applied water occurred due to mismatch between application rates and soil infiltration rate. The second main aim was to propose design techniques and guidelines which will help designers and farmers choose the most suitable machine(s) for specific situations. To this end, the application performance of eleven large travelling irrigators was measured using a sophisticated monitoring system designed and built by NZAEI.
  • ItemOpen Access
    The design of horticultural structures
    (Lincoln College. New Zealand Agricultural Engineering Institute, 1985-08) Pinnell, G. C.; Robinson, M. D.; Lawn, G. D.
    The basic methods and skills used to design horticultural structures are identical to those used to design large buildings or bridges. However, to produce a design that is acceptable to the client, the design approach needs to be significantly different. This paper offers guidance by discussing aspects of design philosophy and consequences of failure. It also reports or refers to research that is particularly relevant to the design of horticultural structures. To this end, the authors recommend the references listed. This is not a comprehensive and stand-alone document. It does however, signpost the directions, and reports on research not previously published. Our experience of horticultural structures has been in the design of artificial shelter, crop supports and horizontal canopies, which are described below.
  • ItemOpen Access
    A simulation model of hill & high country pastoral systems for evaluation of irrigation investment
    (Lincoln College. New Zealand Agricultural Engineering Institute, 1985-12) New Zealand Agricultural Engineering Institute
    The first objective of this study was to develop a simulation model that would allow economic evaluation of alternative farm irrigation schemes in the hill and high country. The model would use estimates of irrigation water supply from a water harvesting model (Borrie and Heiler, 1984) to provide a management and economic evaluation of each engineering option. A second objective was to develop a model framework into which sophisticated submodels could be incorporated if and when they became available. The submodels developed for this study were kept simple and incorporated only sufficient detail to investigate irrigation in the Hakataramea Valley.
  • ItemOpen Access
    Contour handbook : A guide to land contouring using the computer program "Contour"
    (Lincoln College. New Zealand Agricultural Engineering Institute, 1982) Harrington, Graham James
    The aim of this handbook is to give a practical surveyor sufficient information to perform a contour survey using the computer programme called CONTOUR. This program is designed to produce contours of irregularly spaced stadia field readings. The programme is currently implemented at Lincoln College. A programme listing (FORTRAN) is available from the author.