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|Title: ||Investigating Links Between Minerals In Rice Grain And Straighthead|
|Authors: ||Williams, Phillip|
|Issue Date: ||24-Oct-2005|
|Series/Report no.: ||Program 2|
|Abstract: ||Straighthead or “Parrot Beaking” is a “physiological” disorder causing distortion and a high
proportion of missing grains on the rice panicle. Crop losses range from 10 to 30% in
medium grains and as high as 90% in short and long grains.
Straighthead has been recorded in NSW rice crops since 1960s. It occurs in both the
Murrumbidgee and Murray Valleys and the Coleambally Irrigation Area. Straighthead also
occurs in Arkansas, Lousiana and Texas in the USA and in other countries who use other
words to describe it.
There is no known cause of Straighthead although it can be induced in the glass house by
addition of arsenic based compounds and straw or sugar to the soil. In Arkansas
Straighthead is associated with the use of arsenic based herbicides used in cotton during
Straighthead is thought to be a relatively minor problem in the NSW rice area as a whole but
can be devastating to individual growers who have the problem. However, its true extent is
unknown because it is often confused with cold weather sterility and may occur at low levels
unnoticed in many crops.
Straighthead is thought to be related to soil conditions and is not seed borne or transmitted
around the farm.
The symptoms of Straighthead are upright panicles, with misshapen hulls of affected grains
– often called “Parrot Beaking”. This effect is most pronounced in long grain. Medium
grains tend to have some misshapen grain but not all “parrot beak”.|
|Type of Work: ||Other|
|Appears in Collections:||Research Papers|
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