?????????????????
??? ???? ?? ???????? ?????? ?? ?????? ??? ????? ???????? ???? ?? 2 ????? ????? ?????? ??? (60-70%) ?? ???????? ?????? ????????? ??? ???? ???????? (Vijayakumar ??????? 2006). ???? ??????? ???????? ????? ?????? ??? (2007) ?? ????? 16005 ????? ????? ??????? ???? 680 ????? ?? ?????? ??????? 4200 ???/????? (FAO? 2010). ????? ????? ???? ?? 14 ???? ?? ??? 193 ???? ?? ?????? ??? ???? ???? ????? ???? ??????? ???? ????? 90% ?? ????? ???? ???????. ?? ??????? ??????? ?? ????? ???? ?? ??? ??????? ??????? ?????? (5-10 ??) ???? ???? ????? (De Datta? 1981) ??? ?? ??? ??????? ????? ????? ????? ?? ?????? ?????? ??? (500-800) ??? ??? ??? ??? ???? ?? 3000 ??? (Hukkeri ? Sharma? 1980) ???? ?? ??? ??? ????? ????? ???? ????? ????? ??????? ?????? ????????? ???????? ?????? ?????? ?? ???? ????. ???? ????? ????? ????? ?????? ???????? ??????? ?? ????? ????? ???? ?? ?? ??? ?????? ????? ???? ???? ?? ??????? ??????? ???????????? ????? ???? ?????????? ?????? ???? ??? ??? ????????????? ??????? ????? ?? ??? ???? ??? ????? ???? ?????? ????? ??? ?? ??? ????? ????? ?? ??????? ?????? ??????? ?? ????? ??????. ?? ????? ???? ??????? ?? ??? ???? ???? ?????? ???????? ?? ????? ?? ?????? ???????? (Lowlands rice varieties) ????? ??????? ??????? ???????? ???????? ?????? ?? ?????? ???????? (Upland rice varieties) ???????? ?????? (Lafitte ??????? 2002) ???? ????????? ??????? ??? ???????? (Bouman ? Tuong? 2001). ????? ????? ???? ??????? ????? ??? ??????? ?????? ?? 2.5 – 6.5 ??/????? (Bouman ??????? 2007). ?? ??? ??????? ????? ?????? ??? ????? ?????? ?? ?????? ?? ????? ????? ??? ?? ????? ???????? ??? ??? ?????? ????? ??????? ??????? ???????? ?????? ?????? ???? ??????. ???? ?? ????? ???? ??????? ???? ??? ??????? 80-85% ??? ?????? ????? ???????? ???? ??? ?????? ??? ???? ????.
???? ????? ??? ????? ???????? ???????? ???????? ??? ?????? (??? ???? ????) ?????? ???? ?? ???? ?? ????? ?????? ??? ???? ??????? ?????? ????.

?????? ?????? ?????
?? ????? ????? ?? ???? ????? ???? ?? ??????? / ????? ?????? ?????? ?????? 2014. ???? ???? 8 ?????? ?????? ?? ???? ???? 6 ?????? ?????? ?? ???? ??????? ?????? ?? ?????? ?????? ??????? ???? IRRI ?? ??????? (???? 1) ?? ????? ?????? ??? ???? ????? ??????? ?????? 26/6/2014 ?????? ?????? ????? ?? ???? 10 ???? ???? 5 ? ???????? ??? ?? ???? 30 ??. ????? ?? ???? ??? 4 ??????? ?? ???? 5 ???? ??? (0? -15? -33? -75 ? -100) ???? ?????? ????? ????? ?? ???? ??????? 15 ?2. ?????? ????? ???????? ????????? ??????? RCBD ??? ????? ??????? ??????? Split Plot ?? ?????? ???????? ???????? ?????? ??????? main plot ???????? ???? ?????? ??????? sub plot. ???? ???? ????? ?????? ????? Clay Loam. ???? ??????? ????? ??????? (46% ????????) ????? 280 ???/????? ???? ?????? ????? ??? ???? ??? ??????? ??? ???? ????? ?? ??????? ?????? ?????? ?????? ??????? ????? 400 ???/????? ?????? ????? ????? ??? ??????? (???????? ?????? ?????? ????? ???? ?? ??????? ??????? , 1996). ???? ???????? ?????? 30 ????? ????? ???? ?????? ?? ??? ???????? ???????: ?????? ??????? ??? ???????? ???? ??????? ?????? ??? ???? ???????? ??? ????????/?2? ??? ??? ??? ????? ??????. ???? ???????? ??????? ???????? ???????? ???????? Genstat Discovery 4 ?????? ???????? ???????? ?????? ??? ??? ????? LSD ??? ????? ?????? 0.05.

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