Resultados de ensayos de abono. Ejectutado por la Estación de ensayos de agricultura Darmstadt, sacado del folleto "Abono de nitrógeno y neto rendimiento"
Berlin: Paul Parey, ND (ca 1907). First Spanish-language edition. Hardcover. Folio (15 x 19 1/4"). 12 loose plates, as issued. Original gilt-stamped burgundy cloth portfolio, with gold lettering to front cover. This complete set of 12 colored photographic reproductions documents Professor Dr. Paul Wagner's field experiments with nitrogen fertilizer at..... More