玉米秸秆整株原位翻压还田技术研究 ······························,,……马永良都晋眠吕润海张书奎崔四平(l,l)小麦与多枝赖草属间杂种后代纯系的获得及其遗传学研究 ·····,····························· Corn stalk whole plant in situ turning over into the field of technology research ... ... ... ... Lü Runhai Zhang Shukui Cui Siping (l, l) accessions and their inheritance of pure lines of wheat and polyracalia intercropping progeny · · · · · · ···························