汕优63蓄留再生稻的叶片生长与叶面积

LEAF GROWTH AND LEAF AREA OF RATOONING RICE FROM MEDIUM HYBRID RICE SHANYOU 63

本文分析了汕优６３蓄留再生稻叶片的大小、叶面积的测定方法及叶面积的变化，结果表明，再生稻一般只有三片叶，均较短小，且长宽因叶序和萌发节位而异，长宽法叶面积校正系数也随之而不同。剑叶、倒二叶和基部叶的校正系数平均为０．６９４、０．７５３、０．７１２，总平均为０．７２０。叶面积（Ｙ）与叶片的长宽乘积（Ｘ）呈极显著正相关，回归方程为Ｙ＝－０．５７０５＋０．７６１９Ｘ．促芽肥可提高前期叶面积，长苗肥可提高后期叶面积。再生稻单株叶面积主要由剑叶和倒二叶构成，各叶的贡献因生育时期不同而异。

There are usually three leaves on the ratooning plant of medium hybrid rice Shanyou 63. They are all smaller than those of the main crop, especially the basal one, and varied with the leaf position on the ratooning plant and sprouted position of ratooning plant on the main crop culm. As a result, the value of k, the calibration coefficient used to calculate the leaf area with the leaf length and width varied. There was significant correlation between leaf area (y) and leaf length×width (x),and the regression equation y=-0. 5705+0. 7619x was established, which might be used to calculate the leaf area. The BF (bud fertilizer applied 15 day after full heading of the main crop) increased leaf area at the early stage of ratooning rice, while the TF (tiller fertilizer applied one day after harvest of the main crop) increased leaf area at later stage. The leaf area per plant mainly depended on the flag leaf and the second leaf, and the contribution of different leaves to the total leaf area varied at different growth stages.