摘要:
杂交稻高产群体的NPK积累动态呈Logistic生长曲线,积累半量期在枝梗分化至颖花分化期。以中期积累最多(占45%～67%),前期次之(占30%～43%),后期较少(占2%～19%).叶片、叶鞘积累的N、P、K素和茎秆积累的N、P素,抽穗后有50%左右转运到穗部,占籽粒净积累量的2/3以上(N占67%～76%,P占95%～96%,K占100%).黄熟期的稻穗积聚了全株60%～68%的N素,66%～80%的P素,17%～18%的K素;茎秆积聚了全株50%左右的K素。随着生育期的进展,叶片、叶鞘的含N、P、K率,茎秆的含N、P率和稻穗的含K率逐渐降低,茎秆的含K率逐渐上升,稻穗的含N、P率变化不大。
Abstract:
The NPK accumulation and transfer in high yielding colony of hybrid rice growing in Longhai city of Fujian, South eastern China, was determined from 1991 to 1993 The results were showed as follow: 1 In high yielding colony of hybrid rice, the NPK accumulated in plant appeared as Logistic curve with the highest accumulating ratio during the period from primary branch initiation stage to spikelet initiation stage About 45%-67% of total NPK accumulated in plant was absorbed during panicle initiation to heading, 30%-43% absorbed before panicle initiation and 2%-19% absorbed after heading; 2 About 50% of NPK in leaf sheath and NP in stem was transferred to spikelets after heading which accounted for over 2/3 of NPK accumulated in spikelets (N accounted for 67%-76%, P 95%-96% and K 100%); 3 At yellow stage, about 60%-68% of N, 66%-80% of P and 17%-18% of K were accumulated in spikelets, and about half of K accumulated in stem.
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