Uptake of phosphorus by ryegrass and effect of adding organic matter on inorganic P absorption in red soil

Ye Qing-Fu，

Zhang Qin-Zheng，

Xi Hai-Fu，

Wu Gang，

He Zhen-Li

Nuclear Science and Techniques

Vol.9, No.1

pp.56-58

Published in print 01 Feb 1998

22400

³²P-labelled KH₂PO₄ with or without unlabelled ryegrass and ³²P-labelled ryegrass with unlabelled KH₂PO₄ were respectively applied to red soil, and ryegrass was grown in the fertilized soil and harvested one month after sowing and then the radioactivities and total P content in ryegrass were measured. Results show that addition of organic matter to red soil can significantly stimulate the uptake of P by ryegrass seedlings from inorganic P applied to red soil; absorption of P from inorganic source is much greater than that from organic source; at the same application level of P, larger proportion of P derived from labelled inorganic phosphate was distributed in shoots than that from the labelled ryegrass.

32P tracer methodPhosphorus absorptionRed soilRyegrass

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