B.D. Sharma 【题名】：DTPA-extractable and totalZn, Cu, Mn, and Fe in Indiansoils and their association with some soilproperties 【期刊】：Geoderma 【年、卷、期、起止页码】： Volume 49, Issues 1–2, June 1991, Pages 165–179 【全文链接】：http://www.sciencedirect.com/science/article/pii/001670619190099F
【序号】：2 【作者】： W. L. Lindsay and W. A. Norvell
【题名】：Development of a DTPA Soil Test for Zinc, Iron, Manganese, and Copper 【期刊】：Soil Science Society of America Journal 【年、卷、期、起止页码】： Vol. 42 No. 3, p. 421-428 Received:Oct 24 , 1977
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