不同复水措施对油菜生长、产量及品质性状的影响

Effect of different rewatering treatments on growth,yield and quality traits of rapeseed(Brassic napus L.)

以2个油莱品种为材料,在播后30-100 d的苗期干旱胁迫后采取＂水＂、＂水＋钾肥＂、＂水＋钾肥＋赤霉素＂、＂水＋尿素＂、＂水＋尿素＋赤霉素＂等5种复水处理,研究干旱胁迫后各复水措施对油菜生长、产量及品质的影响,分析不同复水措施增产的成因。结果表明：苗期干旱胁迫后,与未复水对照相比,除在皖油19中＂水＂处理未显著提高地上部干重和＂水＋尿素＂处理未显著提高总根干重外,5种干旱恢复措施都显著提高了天禾油11和皖油19的地上部干重、总根干重、小区产量和产油量;5种复水处理对2个油菜品种的地上部干重、总根干重、小区产量和产油量,平均增幅分别达到11.6%、22%、19%和23.7%。5种复水措施中,地上部干重、总根干重、籽粒产量、产油量增幅最大的都是＂水＋尿素＋赤霉素＂,分别增加24.7%、27.7%、34.2%和36.8%。与未复水对照相比,5种复水措施产量增幅由高到低依次为：＂水＋尿素＋赤霉素＂、＂水＋尿素＂、＂水＋钾肥＋赤霉素＂、＂水＋钾肥＂和＂水＂。关联及相关分析表明,5种复水措施促进增产的主要原因是复水显著增加了单株总角果数。

The aim of this study was to investigate the effects of rewatering measures on root,growth,yield and quality traits of rapeseed（Brassica napus L.）.The seedlings of two cultivars were treated by drought stress from 30 days after sowing（DAS30） to 100 days after sowing（DAS100）,and then be rewatered by five treatments：＇Irrigation（I）＇、＇I＋K（KCl）＇、＇I＋K＋G（Gibberellin）＇、＇I＋N（Urea）＇、＇I＋N＋G＇.The results showed that：expect that the treatment of ＇I＇ has no marked effect on the above-ground dry weight and ＇ I ＋ N＇ has no significant increase in total root dry weight in Wanyou No.19,compared to the control,the five rewatering treatments after drought stress at seedling stage could significandy increase the above-ground dry weight,total root dry weight,the seed yield and oil yield in Wanyou No.19 and Tianheyou No.11 with the average increase of 11.6%,22%,19% and 23.7%,respectively.Among the five rewatering treatments,＇I＋N＋G＇ had the largest increase in the above-ground dry weight,total root dry weight,grain yield and oil yield with the average amplitude of 24.7%、27.7%、33.1% and 36.8%,respectively.Compared to the control,the order of increasing amplitude of yield from high to low is ＇I ＋ K＋G＇,＇I＋N＇,＇I＋K＋G＇,＇I＋K＇ and ＇ I＇.The correlation analysis indicated that the main reason that the rewatering treatment could enhance yields owing to the significant increase of the total number of pods per plant.