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

Uptake of phosphorus by ryegrass and effect of adding organic matter on inorganic P absorption in red soil 1 first-author 1 1 1 2 Institute of Nuclear-Agricultural Sciences, Zhejiang Agricultural University, Hangzhou 310029 Institute of Nuclear-Agricultural Sciences, Zhejiang Agricultural University, Hangzhou 310029 Department of Soil Science and Agricultural Chemistry, Zhejiang Agricultural University, Hangzhou 310029 Department of Soil Science and Agricultural Chemistry, Zhejiang Agricultural University, Hangzhou 310029 32 P-labelled KH 2 PO 4 with or without unlabelled ryegrass and 32 P-labelled ryegrass with unlabelled KH 2 PO 4 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. 32 P tracer method Phosphorus absorption Red soil Ryegrass References Hundal H S , Chouhang O P. J Nuclear Agric Biol , 1991 , 20 ( 2 ): 118 J Nuclear Agric Biol Hundal H S. J Nuclear Agric Biol , 1992 , 21 ( 1 ): 28 J Nuclear Agric Biol Vigil M F , Kissel D E , Smith S J. Soil Sci Soc Am J , 1991 , 55 : 1031 Soil Sci Soc Am J Norman R J , Gimour J F , Wells B R. Soil Sci Soc Am J , 1993 , 54 : 1351 Soil Sci Soc Am J Lu Ren-Jun , Huang Zhi-Wu . J South China Agri Univ , 1992 , 13 ( 4 ): 26 J South China Agri Univ Huang Zhi-Wu , Liao Hong . J South China Agri Univ (in Chinese) , 1992 , 13 ( 3 ): 112 J South China Agri Univ (in Chinese) Diekmann et al . Plant and Soil , 1993 , 148 : 91 Plant and Soil Sisworo E L , Esken D L , Sisword W H et al . Plant and Soil , 1990 , 128 : 209 Plant and Soil The Project Supported by the Commission of the European Communities 1997-09-02 1998-02-01 2021-02-05 1998 Nuclear Science and Techniques 1 9