为探讨“中稻+再生稻”高效种植模式在豫南稻区的配套栽培技术，以两优6326为试验材料，开展了头季稻不同留茬高度对再生稻影响的试验。结果表明，随着留茬高度的提高，再生稻的生育期呈先缩短后延长的趋势，每穗粒数、结实率和千粒重降低，总穗数逐渐增加；当留茬高度低于25 cm时，倒4节及其以下节位是再生稻产量贡献的主要节位；当留茬高度在30~40 cm时，倒3节和倒4节是再生稻产量贡献的主要节位；当留茬高度高于45 cm时，倒2节和倒3节是再生稻产量贡献的主要节位。两优6326在留茬高度为45 cm时，再生季生育期最短，产量最高，达到5 665.5 kg/km2，倒2节和倒3节产量的贡献率达70.57%。豫南稻区再生稻栽培可参照两优6326采取“留2保3争4”的措施，在收割时要兼顾当年腋芽生长的长度，充分利用倒2节和倒3节上的优势芽，提高再生稻产量。

In order to explore the high yield cultivation techniques of ratoon rice, a field test was carried out to study the effects of stubble height on ratoon rice with ten different stubble heights, using Liangyou 6326 as material in Xinyang, Henan. The results showed that the growth period was decreased firstly and then increased, the number of grain per panicle, seed setting rate and 1 000-grain weight were decreased, but the total panicle number was increased with the increase of stubble height. When stubble height was 45 cm, 50 cm and 40 cm, the growth period was relatively shorter. When stubble height was under 25 cm, the main contribution to ratoon rice yield were nodes below 4th from top; when stubble height between 30 and 40 cm, the main contribution to ratoon rice yield were 3th and 4th nodes from top; when stubble height above 45 cm, the main contribution to ratoon rice yield were 2th and 3th nodes from top. When stubble height was 45 cm, Liangyou 6326 had shortest growth period and highest yield, the contribution rate of 2th and 3th nodes from top was 70.57%. The cultivation techniques of ratoon rice of South Henan province could be referred to Liangyou 6326, which retain 2th to 4th nodes from top and make full use of it.