Cut-out in cotton 3: Physiological indicators
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Cut-out in cotton 3: Physiological indicators

Cutout’s based on a principle which what
we like to call (in the physiology world) a ‘nutritional hypothesis’. Here we have a crop that actually is cut-out
– how do I know as a physiologist that something like 4-5 nodes above white flower is actually
indicative of cut-out? There’s been a number of research projects
over many many years. One of the first studies done in Australia
was by Brian Herne, who looked at the concept of shedding. So as the fruit load was getting greater on
the crop, there’s more shedding occurring. People who have mapped crops, both here and
in other parts of the world, have seen that about 4-5 nodes above white flower stage in
traditional cotton growing areas, relates to about the time when 95% of the crop has
reached its attainable yield. And the third one is a simple principle where
we’ve measured the biomass, the vegetative growth, and measured the reproductive growth,
the fruit and the squares, and we’ve worked out when those two growth rates meet is the same time as when we get this 4-5 nodes above white flower. So we’re pretty confident in terms of physiology
that these sort of measures, and the concept of cut-out is a fairly robust approach to
understanding the way cotton grows.

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