title: Inorganic phosphorus fractionation and its translocation dynamics in a low-P soil.
abstract: The translocation of different inorganic phosphorus (Pi) forms in a low-P soil (Langfang experimental station, Hebei province, China) over time was investigated using P fractionation extraction and a (32)P tracer technique. The L-value and P availability of the soil was assessed using 5 different maize genotype (Zea mays L.) cultivars. The results showed that the different Pi fractions in the soil increased in the order of H(2)SO(4)-extractable P (Ca(10)-P) > Na(3)C(6)H(5)O(7)-Na(2)S(2)O(4)-extractable P (O-P) > NH(4)Ac-extractable P (Ca(8)-P) > NaHCO(3)-extractable P (Ca(2)-P), NH(4)F-extractable P (Al-P), NaOH-Na(2)CO(3)-extractable P (Fe-P), and the content of plant-unavailable P (Ca(10)-P + O-P) was high, up to 79.1%, which might be an important reason for P deficiency in this low-P soil. The (32)P tracer results showed that after the addition of (32)P-Pi to the soil with no P fertilizer applied for 25 d, 29.0% of (32)P was quickly transformed into Ca(2)-P (rapidly available P), and 66.1% of (32)P was transformed into Al-P, Fe-P and Ca(8)-P (slowly available P). Only 5.0% of (32)P was transformed into O-P and Ca(10)-P (plant-unavailable P). Moreover, in the soil with P fertilizer applied, (32)P transformation into Ca(2)-P increased, and the transformation into Ca(8)-P + Fe-P + AL-P and O-P, Ca(10)-P significantly decreased compared to the soil with no P fertilizer applied (p < 0.05). This result suggested a higher rate for water-soluble P transformation to slowly available and plant-unavailable P in P deficient soil than in soil with sufficient P. The results of maize L-value determination showed that different genotype maize cultivars had different soil P-use efficiency and low-P tolerance mechanisms. Low-P tolerant cultivar DSY-32 regulated soil P-use efficiency and plant P content according to exogenous P fertilizer application. However, another low-P tolerant cultivar, DSY-2, used soil P more efficiently, regardless of the application of exogenous P.
authors.affiliation: Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China. yangjch@263.net
authors.forename: J C
authors.initials: JC
authors.lastname: Yang
authors.forename: Z G
authors.initials: ZG
authors.lastname: Wang
authors.forename: J
authors.initials: J
authors.lastname: Zhou
authors.forename: H M
authors.initials: HM
authors.lastname: Jiang
authors.forename: J F
authors.initials: JF
authors.lastname: Zhang
authors.forename: P
authors.initials: P
authors.lastname: Pan
authors.forename: Z
authors.initials: Z
authors.lastname: Han
authors.forename: C
authors.initials: C
authors.lastname: Lu
authors.forename: L L
authors.initials: LL
authors.lastname: Li
authors.forename: C L
authors.initials: CL
authors.lastname: Ge
mesh_terms: D005591:Chemical Fractionation; D002681:China; D005308:Fertilizers; D005838:Genotype; D010758:Phosphorus / Q000737:chemistry* / Q000378:metabolism*; D010761:Phosphorus Radioisotopes / Q000737:chemistry / Q000378:metabolism; D012588:Scintillation Counting; D012987:Soil / Q000737:chemistry*; D003313:Zea mays / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*
chemical_list: D005308:Fertilizers; D010761:Phosphorus Radioisotopes; D012987:Soil; D010758:Phosphorus