Contents - Greenmount Press
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FIGURe 3: Sicot 74BRF holds higher NAWF<br />
figures through the flowering period<br />
contradicts the popular opinion being that Sicot 74BRF is slow<br />
early season. As will be mentioned later in this article there<br />
is a difference early season in the way this variety sets fruit,<br />
but in terms of reproductive structures the timing and rate of<br />
development Sicot 74BRF is no different to Sicot 71BRF.<br />
How can we exploit this<br />
By driving the Sicot 74BRF plant early to get vigourous growth,<br />
planting into well prepared beds and warm temperatures and<br />
paying strict attention to signs of plant stress pre flowering so as<br />
to time the first irrigation well.<br />
This strategy is going to be the same to extract the most out<br />
of any cotton variety but with Sicot 74BRF it is more appropriate<br />
as you desire to have the plant hitting first flower with a high<br />
NAWF value (8+). To achieve maximum yields out of Sicot 74BRF,<br />
we want to extend the flowering period for as long as possible to<br />
maximise the number of fruiting sites.<br />
Nodes above white flower (NAWF)<br />
Between Sicot 74BRF and Sicot 71BRF there is a significant<br />
difference between the NAWF, not only in recorded number for<br />
any particular time of the season but also in the duration of the<br />
flowering period.<br />
NAWF is an important measurement as it is a barometer of<br />
plant health or stress. The number of and the rate of descent of<br />
NAWF indicates the apparent health or lack thereof, of the crop.<br />
The longer the period for flowering can be extended, the greater<br />
the opportunity to set and retain fruit and therefore the higher<br />
the yield potential of the crop.<br />
Firstly, Sicot 74RF will begin flowering ever so slightly higher<br />
than Sicot 71BRF and then the two varieties diverge with Sicot<br />
74BRF holding onto higher NAWF figures throughout the<br />
flowering period. Analysis has shown that the decline in NAWF<br />
between Sicot 71BRF and Sicot 74BRF is significantly different.<br />
Sicot 74BRF is able to flower for approximately 146 day degree<br />
difference (up to one week) for that period of the summer.<br />
How can we exploit this<br />
By minimising stress on the plant, and creating a happy plant.<br />
There is a dramatic increase in the demands of the crop during<br />
boll fill. Major inputs which management has an influence on<br />
are irrigation and nutrition. Make sure that the plant experiences<br />
minimal water and water logging stress through irrigation timing<br />
and efficiency and have the nutrients available for the plant to<br />
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October–November 2012 The Australian Cottongrower — 49