The essential elements of plant nutrition.

[1] BRANDENBURG E., 1934, Angewandte Botanik, V16, P505

[2] Frey-Wyssling A., 1935, STOFFAUSSCHEIDUNG HO

[3] HOPKINS EF, 1933, MEM CORNELL U AGR EX, V151, P1

[4] MAZE, 1933, C R SOC BIOL PARIS, V112, P852

[5] PIRSCHLE K, 1933, JB BOT, V72, P335

[6] REED, 1934, C R ACAD SCI PARIS, V198, P1535

[7] SCHARRER, 1934, Z PFLANZENERNAHRG, V34, P312

[8] 1935, FORTSCHR BOT, V4, P190

[9] 1934, PLANTA, V23, P177

[10] 1934, FORTSCHR BOT, V3, P117

[1] BRANDENBURG E., 1934, Angewandte Botanik, V16, P505

[2] Frey-Wyssling A., 1935, STOFFAUSSCHEIDUNG HO

[3] HOPKINS EF, 1933, MEM CORNELL U AGR EX, V151, P1

[4] MAZE, 1933, C R SOC BIOL PARIS, V112, P852

[5] PIRSCHLE K, 1933, JB BOT, V72, P335

[6] REED, 1934, C R ACAD SCI PARIS, V198, P1535

[7] SCHARRER, 1934, Z PFLANZENERNAHRG, V34, P312

[8] 1935, FORTSCHR BOT, V4, P190

[9] 1934, PLANTA, V23, P177

[10] 1934, FORTSCHR BOT, V3, P117