Pressurized hot water and DTPA-Sorbitol, viable alternatives for soil boron extraction. (4572)
Authors:
A.K. Shiffler* - Brigham Young University V.D. Jolley - Brigham Young University B.L. Webb - Brigham Young University V.A. Haby - Texas A&M University
Abstract:
The hot water extraction procedure for estimating soil boron (B) availability to plants embodies several potential sources of error. This research compares estimates of plant available B extracted with pressurized hot water and DTPA-Sorbitol to conventional hot water extraction. These methods were
compared for extraction of B from samples of calcareous sand and silt loam and limed, acid loamy fine sand treated with 10 levels of B and incubated for 7 and 28 d. Greenhouse experiments on these same soils and a field study on limed acid soil tested alfalfa responses to applied B. As B rate increased, so did extractable B with each method. High correlations were observed between extractable B and rate of applied B with all extraction methods. In greenhouse studies, highly significant and predictable relationships existed between extractable soil B by each method and tissue B concentration and total B removal. No yield response to applied B was observed in the greenhouse. The field experiment produced a significant positive relationship between alfalfa yield and both hot water and pressurized hot water extractable B but not DTPA-Sorbitol extractable B. Results support pressurized hot water as the better alternative to replace hot water extraction for prediction of plant responses to applied B in a wide range of soils.
Speaker Information: Amanda Shiffler, Brigham Young University, 253
WIDBBrigham Young University, Provo, UT 84602; Phone: 801-422-2491; E-mail:
Session Information: Wednesday, November 3, 2004, 8:00 AM-12:00 PM Presentation Start: 8:00 AM (Poster Board Number: 2521)
Keywords: boron; alfalfa; extraction methods; yield response
