^(15)N示踪研究再生稻施用氮肥的吸收分配和效应

^(15)N Tracer Study Ratooning Rice Applied Nitrogen Absorption,Assignment and Effect

中稻-再生稻的15N示踪结果表明:①15N吸收率在头季稻成熟期为34.22%～43.09%,再生稻成熟期升至38.64%～55.75%.头、二两季一致趋势是促芽肥、保证芽肥早施高于迟施,促芽肥加发苗肥的高施肥量大于低施量.②再生稻成熟期15N在稻株各器官的分配是促芽肥加发苗肥的,头季收获物(穗和1节)平均为41.84%,再生稻株为45.26%,稻桩和根为12.90%;只施促芽肥的,则依次分别为76.81%,14.45%和8.74%.头季稻收获物在大比例带走氮的同时,提高了稻谷蛋白质的含量,并增加稻株含氮量、叶片光合强度、茎鞘干质量、根系活力等,促进了再生芽早生多发.③各施肥方式对再生稻的生育进程和经济性状均有明显的效应,以头季稻齐穗期施保芽肥加齐穗后23d施促芽肥和齐穗后15d施促芽肥加收后立即施发生苗肥的综合效应最显著.

The middleseason rice-ratooning rice＇s 15N tracing result indicated： （1）the 15 N absorption rate in the sea- son rice mature period is 34.22%-43.09%, the ratooning rice mature period climbs to 38.64%-55.75%, the first two seasons consistent tendency is： Bud fertilizer and to Bud pledge fertilizer apply early is higher than late, fertilization mete is more than littler. （2） ratooning rice mature period 15N in rice various organs＇ assignment： Bud fertilizer and to Bud pledge fertilizer, the season harvest （fringe and the frist node） are 41.84% equally, ratooning rice is 45.26%, the rice peg and the root are 12.90% ; nothing but is only to apply Bud fertilizer, then respectively is in turn 76.81%, 14.45% and 8. 74%. The season rice harvest while the great proportion carries off the nitrogen, advance the rice protein content, and increases a rice nitrogen content, the leaf blade photosynthesis intensity, the stem sheath dry weight, the root system vigor and so on, promoted the regeneration bud to live early and send. （3）Applies fertilizer respectively the way has the obvious effect to the ratooning rice birth advancement and the economic character, is bud pledge fertilizer after the frist season rice full heading adding is in the 23days after full heading apply bud fertilizer, in the 15 days after full heading apply bud fertilizer adding apply occurring seeding fertilizer at once, the colligate domino offect is best markedness of the two fashions.