CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2020, Vol. 42 ›› Issue (2): 201-.doi: 10.19802/j.issn.1007-9084.2020034

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


  1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province / Ecology and Cultivation in Middle and Lower Reach⁃es of Yangtse River of Ministry of Agriculture and Rural Affairs, Yangzhou University, Yangzhou 225009, China
  • Online:2020-04-28 Published:2020-05-22


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 dressingwas 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 seed⁃ling 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 diame⁃ter of root neck. Dry weight increased initially and then decreased with the increase of the dosage. Based on compre⁃hensive 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.

Key words:  , Brassica napus L.;rapeseed blanket seedling;seed treatment agent;uniconazole;seed dress?ing;seedling quality

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