种子处理剂不同用量拌种对油菜毯状苗生长的影响

为培育出高质量油菜毯状苗,以适宜机械化移栽,探究种子处理剂(每升含5%的烯效唑5 g,七水硫酸亚铁142 mg,硫酸镁294 mg、硼酸0.6 mg、硫酸锌0.6 mg、硫酸锰0.6 mg,余量为水)不同用量拌种对油菜毯状苗生长的影响。本文以甘蓝型双低杂交油菜宁杂1818和常规油菜扬油9号为材料,设置种子处理剂用量分别为每100 g油菜种子0 mL、0.5 mL、1 mL、1.5 mL、2 mL、2.5 mL、3 mL和4 mL 8个处理,分析其对出苗率、存苗率、苗高、子叶大小、第一叶大小、根颈长度、根颈直径以及干物重等指标的影响。结果表明,适宜用量的种子处理剂能提高出苗率和存苗率,用量过高则显著降低出苗率和存苗率,不同种子处理剂用量均能显著降低苗高,缩短根颈长度增加根颈直径,干物质重随用量的增加呈先上升后下降的趋势,综合各项指标,每100 g种子用2~2.5 mL种子处理剂拌种最优,是适合油菜毯状苗培育种子处理的最佳用量。

Effects of seed dressing with different dosage of seed treatment agent on growth of rapeseed blanket seedling

In order to cultivate high-quality rapeseed blanket seedlings suitable for mechanized transplanting,effect of seed dressing on growth characteristics of rapeseed blanket seedlings were investigated. The seed dressing was designed with different dosage of seed treatment agent. The agent in each litre contained 5 g of uniconazole, 142 mg of ferrous sulfate heptahydrate, 294 mg of magnesium sulfate, 0.6 mg of boric acid, 0.6 mg of zinc sulfate, 0.6 mg of manganese sulfate, which were balanced by water. Brassica napus L. cv Ningza 1818(double-low hybrid variety)and Yangyou 9(conventional variety) were used as materials. The agent dosage of seed treatment was set as 0, 0.5,1, 1.5, 2, 2.5, 3 and 4 mL, 8 treatments in total, to analyze morphological and physiological effects. The indicators included seedling emergence rate, survival rate, seedling height, cotyledon size, first leaf size, root neck length, root neck diameter and dry weight. Results showed that suitable dosage of the agent improved emergence rate and seedling survival rate. Excessively high dosage significantly reduced emergence rate and seedling survival rate. Different dosage of seed treatment agent significantly reduced seedling height and length of root neck, while increased diameter of root neck. Dry weight increased initially and then decreased with the increase of the dosage. Based on comprehensive indicators, seed dressing with 2 mL or 2.5 mL agent per 100 g of seeds was found to be the best dosage for seed treatment.