植物生长调节剂对鸭茅种子产量的影响

植物生长调节剂已经广泛推广运用于牧草种子生产。以“滇北”鸭茅为试验材料,通过两年的大田试验探讨了不同浓度的矮壮素(500、750、1000、1250 g·hm^-2)和不同浓度抗倒酯(100、200、300、400 g·hm^-2)两种植物生长调节剂及其混合制剂(500+50、500+150、1000+50、1000+150 g·hm^-2)对鸭茅种子产量的影响。试验结果表明:喷施3种生长调节剂对鸭茅种子的产量均有提升,以混施矮壮素和抗倒酯(500+150 g·hm^-2)效果最佳,增产达46.2%。此外试验发现,生长调节剂主要是通过增加鸭茅种子田单位面积的生殖枝数目和结实率来提高鸭茅种子产量。喷施植物生长调节剂对千粒重及每穗小花数没有显著影响。

Effect of plant growth regulator on seed yield of Dactylis glomerata

The testing of plant growth regulator (PGR) yielded new insight to improve the seed yield of forage crops. In this study, two PGRs chlorocholine chloride (CCC): 500, 750, 1000, and 1250 g·ha^-1; trinexapac-ethyl (TE): 100, 200, 300, and 400 g·ha^-1] and their mixtures (500+50, 500+150, 1000+50, 1000+150, 1000+150, 1000+150 g·ha^-1) were applied to Dactylis glomerata to evaluate the effect on the seed yield over two years of field trials. The results showed that both growth regulators and their mixtures used in this study increased the seed yield of D.actylis glomerata. The mixture of CCC+TE (500+150 g·ha^-1) resulted in the largest seed yield, which was an increase of 46.2% compared to control plots (without any PGR treatment). The main mechanism for action of the PGR was to increase the fertile tillers per unit area and seed setting rate in the field. The use of PGR had no significant effect on seed weight or on floret number per spike.