Availability of sparingly soluble phosphorus sources to cotton (Gossypium hirsutum L.), wheat (Triticum aestivum L.) and white lupin (Lupinus albus L.) with different forms of nitrogen as evaluated by a 32P isotopic dilution technique
作者： XiaoJuan Wang , Chris N. Guppy , Laura Watson , Peter W. G. Sale , Caixian Tang
DOI: 10.1007/S11104-011-0901-0
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摘要: Previous studies revealed that cotton plants grown on soils with low available-P were accessing significant non-fertilizer P sources. This suggests can access stable-P pools from soil. study examined cotton’s ability to utilize sparingly soluble sources in comparison wheat and white lupin. Plants for 45 days a Vertosol supplied AlPO4 hydroxyapatite, NH4-N or NO3-N. A 32P dilution technique was used determine the availability plant uptake of these Three species differed substantially acquisition When averaged over N sources, proportion shoots sourced 89%, 54% 19% wheat, lupin, respectively. lupin 75% added P, contrast 36% 17% cotton. nutrition increased hydroxyapatite all Cotton is inefficient utilizing while efficient mobilising using hydroxyapatite. The superiority utilization may be related its high root length density.
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