An Empirical Law Describing Hetrogeneity in the Yields of Agricultural Crops
        - H. Fairfield Smith (1938) Journal of Agricultural Science, 28: 1-23.

 

 

Studies in Soil Cultivation

I, The evolution of a reliable dynamometer technique for use in soil cultivation experiments. Bernard A. Keen and William B. Haines (1925) Journal of Agricultural Science, 15: 375-386.

II. Test  of soil uniformity by means of dynamometer and plough. William B. Haines and Bernard A. Keen (1925) Journal of Agricultural Science, 15: 387-394.

III. Measurements on the Rothamsted classical plots by means of dynamometer and plough. William B. Haines and Bernard A. Keen   (1925) Journal of Agricultural Science, 15: 395-406.

IV. A New form of traction dynamometer. William B. Haines and Bernard A. Keen   (1928) Journal of Agricultural Science, 18: 724-733

 

 

Plate 1                    Plate 2

 

 

W.J. Youden and A. Mehlich, Selection of efficient methods for soil sampling, Contributions of the Boyce Thompson Institute for Plant Research 9 (1937), pp. 59–70.

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