共 9 条
[2]
CHEN Y, 1976, SCANNING ELECTRON 3, P425
[3]
FLAIG W., 1951, ZEITSCHR PFLANZENERNAHR DUNG U BODENK, V52, P1
[6]
KODAMA H, 1967, FUEL, V46, P87
[8]
VISSER SIMON A., 1963, SOIL SCI, V96, P353, DOI 10.1097/00010694-196311000-00012
[9]
WIESEMULLER W., 1965, Albrecht-Thaer-Arch., V9, P419