1. 1
   Response of young corn plants to inorganic phosphates differing in solubility and a fractionation of the organic phosphorus constituents of a soil

   by Dickman, Sherman Russell
   Published 1940

   1940.

   95 leaves : ill. ; 28 cm.

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2. 2
   Compaction properties of vertisols and their potential effect on sunflower

   by Kirchhof, Gunnar
   Published 1993

   1993.

   5 microfiches.

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3. 3
   The effect of aluminium on plant growth and its amelioration in acid subsoils of the Western Cape

   by Kotzé, Willem Adriaan Gysbert
   Published 1974

   1974.

   iv, 100 p., [39] leaves of plates : ill.

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4. 4
   Soil and plant analysis : a laboratory manual of methods for the examination of soils and the determination of the inorganic constituents of plants

   by Piper, C. S. (Clarence Sherwood)
   Published 1944

   New York : Interscience, 1944.

   xiv, 368 p. : ill. ; 22 cm.

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