共 9 条
[1]
ATTOE O. J., 1947, SOIL SCI SOC AMER PROC, V12, P131
[3]
HARTWELL BL, 1908, RHODE ISLAND STA RPT, P243
[5]
RHODE G, 1939, ERNAHR PFLANZE, V35, P230
[7]
SNEDECOR GW, 1946, STATISTICAL METHODS
[8]
VANGINNEKEN PJH, 1938, MEDEDEEL I SUIKERBIE, V8, P314
[9]
VANSCHREVEN DA, 1937, MEDEDEEL I SUIKERBIE, V7, P219