再生稻高产特征及其与发苗力、根系活力的关系（英文）

目的]研究再生稻产量性状特征及其与收获前的发苗力、根系活力间的关系。方法]以18个近年通过审定的杂交中稻组合为材料,在再生稻高产栽培条件下,分析再生稻产量构成特征,研究其与发苗力和根系活力的关系。结果]高有效穗数（X1）和高结实率（X4）是高产再生稻组合的重要特征;头季稻收割后第5日再生芽出鞘数是再生稻产量形成的关键因子;头季稻收割后第5日再生芽出鞘数和再生稻发苗力与再生稻有效穗呈极显著正相关,相关系数分别为0.80＊＊和0.76＊＊,但发苗力决定有效穗数;头季稻成熟期单茎伤流量与再生稻着粒数、结实率呈显著正相关,相关系数分别为0.50＊和0.48＊,与平均穗重呈极显著正相关,相关系数为0.63＊＊。结论]提高再生稻发苗力和提高头季稻成熟期根系活力将是试验所在生态区进一步提高再生稻产量的重要途径。

Characteristics of Retoon Rice Yield Components and Relationship of the Characteristics with Rate of Bud Emergence and Root Activity

Objective] The aim was to study on characteristics of retoon rice yield components, and relationship of the characteristics with born bud rate and root ac- tivity of retoon rice before harvesting. Method] Eighteen mid-season hybrid rice va- rieties approved recently were taken as materials in high-yield cultivation conditions. Characteristics of retoon rice yield components were analyzed, and relationship of yield components characteristics with the rate of bud emergence and root activity of retoon rice before harvesting was explored, based on related data. Result] Highly- yielding retoon rice is characterized by high effective ear number （Xl） and high set- ting percentage （X4）; the number of germinated shoots the 5^＊ d after first-batch rice was cut is a key factor for retoon rice yield and was of positive correlation with re- toon rice seedlings and effective ears, with correlation coefficients at 0.80^＊＊ and 0.76^＊＊. In addition, bleeding sap was of positive correlation with grain number and setting percentage of retoon rice and correlation coefficients were 0.50^＊ and 0.48^＊＊, and of positive correlation with average panicle weight, with correlation coefficient at 0.63. Conclusion] It is an effective way for the rate of bud emergence and root activity at lar ecological zones. mproving retoon rice yield to increase harvesting in the test sites and simi lar ecological zones.