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- [5] EFFECTS OF VARIOUS TILLING TECHNIQUES ON SOIL STRUCTURE AND STRUCTURE STABILITY LANDTECHNIK, 1982, 37 (02): : 58 - 60
- [8] PREDICTING CORN YIELDS ON A CLAYPAN SOIL USING A SOIL PRODUCTIVITY INDEX TRANSACTIONS OF THE ASAE, 1987, 30 (05): : 1347 - 1352