双季杂交稻超高产品种搭配模式研究

以双季常规稻搭配(湘早籼45号-湘晚籼12号)为对照,采用田间小区试验方法,对T优705-湘丰优103(M1,早熟早稻-早熟晚稻)、金优974丰源优272(M2,中熟早稻-中熟晚稻)、金优402-T优6135(M3,迟熟早稻-迟熟晚稻)3种双季杂交稻搭配的早、晚稻生长发育和周年产量进行了研究.结果表明,各处理早、晚稻(整个生育期)叶面积指数表现为:M3＞M2＞M1＞CK.早稻分蘖盛期和齐穗期,各处理水稻地下部分干物质积累量表现为M1＞M3＞M2＞CK;灌浆期和成熟期,水稻植株的地上部分干物质积累量顺序为M3＞M2＞M1＞CK;晚稻齐穗期、灌浆期和成熟期,地下部分干物质积累量表现为M3＞M1＞M2＞CK.M1和M2处理早、晚稻生育期适宜,均有利于晚稻的安全齐穗,双季水稻总产量分别为16 189.3、15 494.7 kg/hm2,分别比对照增加25.01％、19.65％.由此可见,早、晚稻选择生育期适中的高产早、中熟品种搭配的栽培模式有利于保证双季水稻周年高产.

Study on collocation modes for double-season hybrid rice varieties to optimize yield potential

Effects of collocation modes of three hybrid varieties on growth and total yield of early and late rice under field plot conditions were studied in the present paper.The collocation modes of hybrid varieties including Tyou705-Xiangfengyou103 (M1),Jinyou974-Fengyuanyou272 (M2),Jinyou402-Tyou6135 (M3) were designed and a conventional variety collocation mode (Xiangzaoxian 45-Xiangwanxian 12) was used as control.The results showed that the leaf area index (LAI) of early and late rice between different varieties was following M3>M2>M1>CK.The order for dry matter accumulation of root at active tillering stage and full heading stage was M1>M3>M2>CK,whereas the order for dry matter accumulation of stem and leaves at filling stage and mature stage of early rice was the same as that of LAI.The order for dry matter accumulation of root at full heading stage,filling stage and mature stage of late rice was M3>M1>M2>CK.As far as the growth duration was concerned,M1 and M2 collocation modes were safe for full heading and total rice yields could reach to 16 189.3 and 15 494.7 kg/hm²,equals to 25.01% and 19.65% higher than that of the control,respectively.The results indicated that the collocation modes of early and late rice with early and middle growth durations were the optimal modes to produce the highest annual rice yield.