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Unified Weak and Strong Soil Tests to Estimate Intrinsic Plant Available Phosphorus Pools

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成果类型:
期刊论文
作者:
Shuai, Xiufu;Ma, Liwang;Wendroth, Ole
通讯作者:
Shuai, XF
作者机构:
[Shuai, Xiufu] Cent China Normal Univ, Hubei Prov Key Lab Geog Proc Anal & Simulat, Sch Urban & Environm Sci, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
[Ma, Liwang] USDA ARS, Rangeland Resources & Syst Res Unit, 2150 Ctr Ave,Bldg D, Ft Collins, CO 80526 USA.
[Wendroth, Ole] Univ Kentucky, Dept Plant & Soil Sci, 1100 Nicholasville Rd, Lexington, KY 40546 USA.
通讯机构:
[Shuai, Xiufu] Cent China Normal Univ, Hubei Prov Key Lab Geog Proc Anal & Simulat, Sch Urban & Environm Sci, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
语种:
英文
期刊:
AGRONOMY JOURNAL
ISSN:
0002-1962
年:
2018
卷:
110
期:
3
页码:
859-867
文献类别:
WOS:Article
所属学科:
ESI学科类别:农业科学;WOS学科类别:Agronomy
入藏号:
机构署名:
本校为第一且通讯机构
院系归属:
城市与环境科学学院
摘要:
Novel approaches for defining and measuring intrinsic P were developed based on the soil P adsorption reactions kinetics in tropical soils. Weakly and tightly adsorbed P pools were proposed as latent variables to describe the internal soil P status. The Olsen extractable P by a weak soil test contained only the weakly adsorbed P pool, and the modified Truog extractable P by a strong soil test contained both pools. The objectives of this study were to develop and test a new method that estimates the tightly adsorbed P pool using mathematical models derived from the state-space modeling technique. Five fertilizer phosphate (0-800 mg P kg(-1) soil) rates were applied to seven tropical soils. Soil P was then extracted with the Olsen and modified Truog methods at nine times during a 180 d incubation. Results showed that the extraction efficiencies by the modified Truog method decreased as soil P sorption site density increased. For the seven soils, 22% to 62% of the weakly adsorbed P pool was extracted by the modified Truog method, and it was 28.8% higher than the Olsen method. For soils with low P sorption capacity, 14% to 36% of the tightly adsorbed P pool was extracted by the modified Truog method whereas only small portions were extracted from soils with high P sorption capacity. This research can be used to develop a mechanistic approach for determining P recommendations designed to optimal yields and minimize the impact of agriculture on the environment.
参考文献:
Alvarez R, 2017, AGRON J, V109, P2278, DOI 10.2134/agronj2017.01.0014
Arai Y, 2007, ADV AGRON, V94, P135, DOI 10.1016/S0065-2113(06)94003-6
ATKINSON RJ, 1974, J CHEM SOC FARAD T 1, V70, P1472, DOI 10.1039/f19747001472
AYRES A. S., 1952, HAWAIIAN PLANTER S REC, V54, P81
BARROW NJ, 1975, SOIL SCI, V119, P167, DOI 10.1097/00010694-197502000-00010

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