00505nam a2200181Ia 4500 CTU_29249 210402s9999 xx 000 0 und d 633.18523 Y94 Long-Ping Yuan Technology of hybrid rice production Long-Ping Yuan, FAO, Xi-Qin Fu Rome FAO 199 rice production Nguyễn Quang Điền, 990315 Trung tâm Học liệu Trường Đại học Cần Thơ