✦ LIBER ✦

A method of energy balancing in crop production and its application in a long-term fertilizer trial

✍ Scribed by K.-J. Hülsbergen; B. Feil; S. Biermann; G.-W. Rathke; W.-D. Kalk; W. Diepenbrock

No coin nor oath required. For personal study only.

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