na INLIS000000000002741 Ind 0010-1118002741 Chemical characteristics of continously cropped soils and how to improve them JUNG-HUI YOON Jung-Hui Yoon Taipei ASPAC 1989 8 p. : ill. ; 26 cm.-- 8 p. : ill. ; 26 cm.-- Bibl. p. 7-8 631.41 SOIL CHEMICOPHYSICAL PROPERTIES 1231/MS/91