播种量对华南优质籼稻钵体秧苗素质的影响

Effect of Sowing Rate on Pot Seedling Quality of High Quality Indica Rice in South China

以华南优质杂交籼稻泰丰优208和常规籼稻南晶香占为材料,研究了小、中和大3种播种量对秧苗长势、空穴率、株高和生物量的影响。结果表明,南晶香占在大播种量时的成苗率比小播种量降低6.1%,泰丰优208在各播种量时的成苗率差异不显著。随着播种量的增大,水稻空穴率显著下降。泰丰优208和南晶香占在大播种量时的空穴率分别比小播种量降低2.90%和5.08%。泰丰优208秧苗前期(0~7 d)的株高播种量的增加而增加,后期(7~13 d)随着播种量的增加而下降;南晶香占前期株高随播种量增加而下降,后期株高保持不变。秧苗前期根系、地上部和总生物量都随播种量的增加而增加,后期则下降,插秧前的秧苗根系、地上部和总生物量不受播种量的影响。播种量与成苗率、空穴率、插秧前的株高呈显著负相关,与秧苗前期生物量呈正相关。大播种量(3~4粒/孔)能减少空穴率,协调秧苗株高和生物量的增加,从而提高钵体秧苗的群体质量。

Seedlings growth,empty hole rate,plant height and biomass were conducted with low,medium and more sowing rates us-ing Taifengyou208(TFY208)and Nanjingxiangzhan(NJXZ)being the high quality both hybrid and inbred indica rice in South China.Results indicated that,seedling emergence rate of NJXZ under more sowing rate was lowered by 6.1%than that under low sow-ing rate.No significant difference for seedling emergence rate of TFY208 at varied sowing rate was detected.With the increase in sow-ing rates,empty hole rate was lowered significantly.Empty hole rates of both TFY208 and NJXZ were reduced by 2.90%and 5.08%un-der more sowing rate than low sowing rate,respectively.Plant height of TFY208 was increased with increase in sowing rate during early seedling period(0-7 days after sowing),while reduced during late seedling period(7-13 days after sowing).The plant height of NJXJ was reduced with the increase in sowing rate during early seedling period,while was comparable during late seedling period.Root,shoot and total biomass during early seedling period were increased with the increase in sowing rate,while reduced during late seedling period.The root,shoot and total biomass before transplanting weren't affected by sowing rate.In addition,sowing rate was negatively correlated with seedling emergence rate,empty hole rate and plant height before transplanting,while was positively correlated with bio-mass during the early seedling period.Taken together,more sowing rate(3 to 4 seeds per hole)could reduce empty hole rate,co-ordinate increase in plant height and biomass,thus improve population quality of pot seedlings.