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Towards a crop growth, development, and yield model for Lupinus angustifolius L. (narrow leafed lupin) in Tasmania

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Bishop, A(Andrew) (1994) Towards a crop growth, development, and yield model for Lupinus angustifolius L. (narrow leafed lupin) in Tasmania. Research Master thesis, University of Tasmania.

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Abstract

Experiments were conducted between 1988 and 1990 at Elliott,
Cressy, and Ross in Tasmania using three cultivars (Yandee,
Geebung, and 75A329) of narrow-leafed lupin (Lupinus angustifolius).
The purpose of these experiments was to examine narrow-leafed
lupin growth and development in Tasmania in relation to specific
environmental factors. These factors were related to growth and
development measurements. It was hoped to use these relationships
in a simple crop model suitable for assessing sites for the commercial
production of lupins.
Preliminary experiments in 1988 examined the lupin cultivars
for agronomic suitability in Tasmania. Increased grain yield was a
function of more pods/m2 rather than increased pods/plant. This
suggested that lower, yields of the indeterminate line 75A329 could be
compensated for by a higher plant density than in the indeterminate
cultivars. Lupins responded to higher rainfall and extended growing
season at Elliott thus outyielding crops at Cressy and Ross.
Detailed field experiments were conducted in 1989 and 1990 at
Elliott and Cressy. Lupin crops developed very slowly in the first 8-
10 weeks, and then grew rapidly after flowering was initiated. It
appeared floral initiation was a function of higher temperatures and
longer days in Yandee and 75A329, with further responses to
vernalisation in Geebung.
Plant density significantly affected grain yield. 75A329 showed
the largest yield responses to increased plant density. Although
increased plant density resulted in increased leaf area, leaf
senescence took place earlier in the highest density crops probably
due to competitive effects. Optimum density for the indeterminate cultivars was 40 plants/m2. It may be higher for determinate cultivars. Low density crops were able to utilise their leaf area for
light interception more efficiently than high density crops. In the
latter, branches and leaves were pushed more towards vertical rather
than horizontal thus less leaf area was presented to intercept light.
The study established that early sowing of lupins in Tasmania
allows more time to grow and develop and yield more grain. A direct
relationship was established between increased total dry matter and
increased grain yield.
The model developed in this study used thermal time as its
only external factor to determine L, intercepted radiation (%), and
total dry matter (kg/ha) during crop growth. From the predicted
figure for total dry matter accumulated by harvest time, an estimate
of potential grain yield could be made for that crop.
This study demonstrated the principle of collecting agronomic
data and, guided by basic plant physiological principles and
mathematical procedures, assembling simple sub-models that when
linked can approximate a particular aspect of crop growth.

Item Type: Thesis (Research Master)
Keywords: Lupinus angustifolius, Lupines, Lupines
Copyright Holders: The Author
Copyright Information:

Copyright 1994 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.Ag.Sc.)--University of Tasmania, 1995. Includes bibliographical references

Date Deposited: 25 Nov 2014 00:42
Last Modified: 11 Mar 2016 05:55
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