播期对地膜甜菜个体发育及产质量的影响

为探讨播期与地膜甜菜生长发育的关系,指导生产适期播种,开展播期对地膜甜菜个体发育及产质量的影响研究.试验结果表明,随播期延后地膜甜菜出苗时间缩短,4月1日至5月1日,每晚播10d地膜甜菜出苗所需时间平均缩短1.7d.叶片数、叶丛高度、块根最大直径、根体长度和单根重量等指标均随着播期的延后呈现下降趋势.含糖率随播期延后呈先增后减的变化趋势.每早播10d新甜14号决根产量和产糖量平均提高13.4％和14.0％;Beta218块根产量和产糖量平均提高20.6％和21.8％.因此,应通过适期早播提高甜菜产量和产糖量.

Effect of Sowing Time on Ontogenetic,Yield and Quality of Plastic Film Mulching Sugarbeet

The effective research of sowing time on ontogenetic and yield and quality of plastic film mulching sugarbeet was carried out to investigate a relationship between sowing date and growth of plastic film mulching sugarbeet as a guidance of proper sowing time. The results showed that emergence time was averagely shortened 1.7 days as the sowing date delayed 10 days from April 1 to May 1. Leaf number, foliage height, root diameter, root length and root weight were decreased as sowing date delayed. Sugar content was increased, then decreased as delayed sowing date. Root yield and sugar yield of Xintianl4 were increased by 13.4% and 14.0%, respectively, when early sowing 10 days. Moreover, both root and sugar yields of Beta218 were increased by 20.6% and 21.8%, respectively, when early sowing 10 days. Therefore, root yield and sugar yield could be increased through suitable early sowing.