The total accumulation of N and P were 22. 54kgand 3. 13kg, and it needs 8. 60kg N and 1.19kg P in formulation of 100kg seed; The total accumulation of dry material was 876.47kg,the ratio of grain/stem was 0. 51, and the economic index was 0. 30.

• 氮磷总积累量分别为22.；28kg和3