Abstract: The variations of grain yield, source-sink characteristics, dry matter and N, P, K distribution in different organs of above ground plants of mid-season hybrid rice were studied in winter water-logged field. The experiment was conducted with 20 mid-season hybrid rice combinations grown in 3 cultivation models of high-density with low-fertilization（HL）, mid-density with mid-fertilization （MM） and low density with high fertilization （LH）, in a randomized block design with 3 replications. Data were analyzed by the variance and regression.The results showed that the effects of cultivation models and hybrid rice combinations on grain yield and dry matter weight in different organs of above ground plants were much greater than on the N、P、K content. Meanwhile, the effects of cultivation models were bigger than that of hybrid rice combinations. Grain yield and dry matter weight showed HL＞MM＞LH, harvest indexes showed HL＜MM＜LH. N and P were mainly distributed in grain, and K were mainly distributed in stems; N use efficiency showed HL＞MM＞LH, P and K use efficiency showed HL＜MM＜LH. Mid-large panicle type hybrid rice combinations with low chlorophyll content, high spikelets-leaf ratio, high 1 000-grain weight and high grain yield at full heading, had high use efficiency of N, P and K.

Key words: winter water-logged field, mid-season hybrid rice, cultivation model, source-sink characteristic, nutrient use efficiency

摘要： 以20个杂交中稻组合为材料，在冬水田条件下，研究了高密低肥、中密中肥和低密高肥3类栽培模式对产量、库源性状、地上部干物质及氮、磷、钾吸收累积的影响。结果表明，栽培模式和杂交组合对产量、地上部干物质量的影响较大，对氮、磷、钾在各器官中含量作用相对较小；其中栽培模式的影响大于杂交组合的作用。产量和干物质量表现为高密低肥＞中密中肥＞低密高肥，收获指数则表现为高密低肥＜中密中肥＜低密高肥。氮和磷主要分配到穗部，钾主要分配到茎；3种栽培模式氮的利用效率表现为高密低肥＞中密中肥＞低密高肥，而磷和钾则表现为高密低肥＜中密中肥＜低密高肥。齐穗期叶绿素含量低和粒叶比高、成熟期千粒重和产量高的中、大穗型杂交组合，其氮、磷、钾稻谷生产效率高。

关键词: 冬水田, 杂交中稻, 栽培模式, 库源性状, 养分利用效率