共 22 条
[2]
CHAPMAN H. D., 1939, SOIL SCI SOC AMER PROC, V4, P196
[3]
CHAPMAN HD, 1945, CITRUS LEAVES MAR
[6]
HEWITT EJ, 1946, MIN DEFIC C AGR RES
[7]
HEWITT EJ, 1946, 1945 AGR HORT RES ST, P51
[8]
HEWITT EJ, 1947, 1946 AGR HORT RES ST, P50
[9]
Hopkins E. F., 1944, JOUR AGRIC UNIV PUERTO RICO, V28, P43
[10]
Koenig P., 1910, LANDWIRTSCH B, V39, P775