Dougall, A.J. and Kahl, M.K. (2007) Phosphorus concentrations in the leaves of cotton in tropical Australia are determined by temperature. Journal of Plant Nutrition, 30 (11). pp. 1885-1902.
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Article Link(s): http://dx.doi.org/10.1080/01904160701627009
Publisher URL: http://www.tandf.co.uk/journals/alphalist.asp
Previous research on P leaf analysis for detecting deficiencies in cotton (Gossypium hirsutum L.) has not considered temperature as a determining factor. This is despite correlations between leaf P content and temperature being observed in other crops. As part of research into a new cotton farming system for the semi-arid tropics of Australia, we conducted two P fertiliser rate experiments on recently cleared un-cropped (bicarbonate P < 5 mg kg- 1) and previously cropped (bicarbonate P 26 mg kg- 1) soil. They aimed to develop P requirements and more importantly to determine if temperature affects the leaf P concentrations used to diagnose P deficiencies. In 2002, optimal yield on un-cropped, low P soil was achieved with a 60 kg P ha- 1 rate. In 2003, residual P from the 40 kg P ha- 1 treatment produced optimal yield. On cropped, high P soil there was no yield response to treatments up to 100 kg P ha- 1. On low P soil, a positive correlation was observed between P concentration in the youngest fully-unfurled leaf (YFUL), fertiliser rate, and mean diurnal temperature in the seven days prior to sampling. On high P soil, a positive correlation was observed between the YFUL and mean diurnal temperature however there was no correlation with fertiliser rate. These results show that YFUL analysis can be used to diagnose P deficiencies in cotton, provided the temperature prior to sampling is considered.
|Additional Information:||© Taylor and Francis.|
|Keywords:||Concentration; leaf; lint yield; northern Australia; phosphorus; soil; temperature.|
|Subjects:||Agriculture > Agriculture (General) > Agricultural meteorology. Crops and climate|
Agriculture > Agriculture (General) > Fertilisers
Plant culture > Field crops > Textile and fibre plants
Science > Botany > Plant physiology
|Deposited On:||18 Nov 2008 01:25|
|Last Modified:||30 Mar 2011 06:08|
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