1. Rate of absorption of soil constituents at successive stages of plant growth;Burd;J. Agric. Res.,1919
2. Characteristics of the growth and mineral nutrition of hemp with simultaneously maturing male and female plants;Dobrunow;C. r. Acad. Sci. URSS,1937
3. Studies in the nutrition of the strawberry;Gardner;Univ. Missour. Agric. Exp. Stat. Bull.,1923
4. Differences effected in the protein content of grain by applications of nitrogen made at different growing periods of the plant;Gericke;Soil Sc.,1922
5. Über die herbstliche Änderung von Stickstoff und Trockengewicht im Laubblatt einer einjährigen Pflanze;Gouwentak;Rec. Trav. Bot. Néerl.,1931