Plant availability of applied and native boron in soils with diverse properties |
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Authors: | Ji-Yun Jin D C Martens L W Zelazny |
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Institution: | (1) Department of Agronomy, Virginia Polytechnic Institute and State University, 24061 Blacksburg, VA, USA;(2) Present address: Soil and Fertilizer Institute, Chinese Academy of Agricultural Sciences, Beijing, China |
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Abstract: | Laboratory and greenhouse research was conducted to study effects of soil properties on the availability of native and applied
B in 14 Virginia soils. Boron absorption could be described by the Langmuir equation in 12 of the 14 soils, and maximum B
adsorption (Vmax) in these 12 soils ranged from 3.3 to 26.5 mg kg−1. A multiple regression equation, −19.3+3.51 pH+0.048 clay content, accounted for 89.6% of the variation in Vmax for the 12
soils. Curvilinear relationships (α=0.01) occurred between B in corn (Zea mays L.) tissue from native B and hot-water soluble B, mannitol exchangeable B, and NH4-acetate and Mehlich III extractable B. Among these four procedures, mannitol exchangeable B correlated most closely (r=0.923)
with B in corn tissue from native B. From 0.4 to 13.5% of the applied B was absorbed by corn plants and translocated to shoots.
Curvilinear relationships (α=0.01) occurred between B in corn tissue from applied B and soil clay content, NH4-oxalate extractable Al and Fe, and acidified NH2OH·HCl extractable Mn. It is evident from these relationships that soil clay and oxyhydroxides of Al, Fe, and Mn have an affinity
to adsorb B in somewhat unavailable forms. |
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Keywords: | B adsorption hot-water soluble B Langmuir equation mannitol extractable B Mehlich III extractable B NH4-acetate extractable B |
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