不同旱控育秧方式对杂交晚稻秧苗素质及产量形成的影响

选用超级杂交晚稻品种五丰优T025,以水播水育喷施多效唑育秧方式为对照（CK）,重度干旱复水重肥育秧（T1）和轻度干旱复水喷施多效唑育秧（T2）为处理,考察秧苗素质、移栽后一个月内分蘖及倒二叶叶绿素含量动态,成熟时产量及其构成因素、收获指数等。结果表明：移栽时T1株高、倒二叶叶长极显著高于T2及CK,其单株分蘖数则极显著低于后者,而3种育秧方式下叶龄、茎基宽、白根数、倒二叶叶宽、倒二叶叶角、植株鲜重、根干重和植株干重均无显著差异;移栽后第3至12天T1倒二叶叶绿素含量（SPAD值）极显著低于其它两种育秧方式,移栽后15~30 d 3种育秧方式间无显著差异。T2单株产量显著高于其它两种育秧方式,较CK和T1分别高出24.60%和23.07%,这与其单株有效穗数较T1多19.80%,结实率较CK高7.91%相对应。T1收获指数显著高于CK,T1、T2、CK依次为59.89%、59.03%、56.82%。轻度干旱复水联合喷施多效唑控苗是较为理想的双季杂交晚稻长秧龄育秧方式。

Effects of Seedling-cultivation Methods of Different Drought Levels for Growth-controlling on Seedling Quality and Yield Formation of Hybrid Late Rice

The hybrid late super rice variety Wufengyou T025 was used as experimental material. The control （CK） was water seedling with spraying paclobutrazol, the treatment T1 was heavy drought and water recovery with highly nitrogen, the treatment T2 was light drought and water recovery with spraying paclobutrazol, and seedling quality, the dynamics of tillers and the chlorophyll concentration of the reciprocal second leaf 30 days after the transplanting, yield, yield components and harvest indexes at mature were investigated. Results were as follows： Plant height and the length of the reciprocal second leaf of TI was significantly higher or longer than those of CK and T2, while its tillers per plant was the most significantly less than that of CK and T2 at transplanting. There were no significant difference among CK, T1 and ＂1＂2 in leaf age, width of stem base, and number of white root, width of the reciprocal second leaf, angle of the reciprocal second leaf, fresh weight per plant, dry weight of root and dry weight per plant. Chlorophyll concentration in the reciprocal second leaf of T1 was the most significantly less than CK and T2 from 3 to 12 days after transplanting, and there were no significant differences among the three seedling-cultivation methods from 15 to 30 days after transplanting. Yield per plant of T2 was significantly higher than that of the other two seedling-cultivation methods, and was 24.60% and 23.07% more than the CK and T~ respectively, and it was corresponding to its effective panicles per plant 19.80% higher than T1, and seed-setting rate 7.91% higher than CK. The harvest index of T1 was significantly higher than that of CK, TI, T2 and CK was 59.89%, 59.03%, 56.82% in turn. The seedling-controlling for the light drought and water recovery with spraying paclobutrazol was the idea seedling-cultivation method for the double-season hybrid late rice of long seedling age.