Promote rapeseed seed germination and cultivate vigorous seedlings
隐藏域元素占位
Promote rapeseed seed germination and cultivate vigorous seedlings
Application of Regulators to Promote Rapeseed Seed Germination and Cultivate Vigorous Seedlings
Triacontanol
Soaking seeds with 0.05 mg/L triacontanol (Brassica oleracea "Shanghai 23") for 5 hours can significantly improve the seed germination rate and lay a good foundation for cultivating early and strong seedlings.
Brassinolide
Soaking seeds with 0.3 mg/L triacontanol for 12 h can significantly improve the seed germination rate, increase the enzyme activity, and promote the resistance of seedlings.
Choline chloride
Spraying 500 mg/L choline chloride liquid at the 5-leaf stage can improve the osmotic regulation ability of rape leaves under drought stress, increase the antioxidant level or inhibit its decline rate, and alleviate the damage to the cell membrane of rape seedlings by drought stress. In turn, the resistance of seedlings was enhanced, and the mitigation effect was more significant for drought-sensitive varieties.
Paclobutrazol
In the case of large seeding amount, high temperature or abundant rainfall, the petioles and plant heights of rape seedlings tend to grow too fast, that is, "tall seedlings" appear.Such weak seedlings have slow rooting after transplanting, low survival rate and low yield. In order to prevent "high-footed seedlings", 15 paclobutrazol 40~50g per mu can be used in the 3-leaf stage, add water, and spray 50~60 kg.When planting, the seedling height decreased by 15.1%, the shrinking stem section was shortened by 51.2%, the root neck thickness was increased by 11.5%, the number of green leaves per plant was 0.4 more than the control, the leaf thickness was increased by 18.0%, and the leaf color was dark green. The chlorophyll content was 51.0% higher than that of the control.The seedlings with paclobutrazol were less damaged during pulling and planting, less damaged after transplanting, 2 to 3 days earlier for live seedlings, improved cold resistance, and less frost damage. The yield increase effect and economic benefit are obvious. The per mu application of 40g and 50g paclobutrazol increased by 11.6 kg and 15.0 kg respectively compared with the control, and the ratio of investment to income was 1:68.5 on average.
Uniconazole
Soaking the seeds with 15-20 mg/L uniconazole for 1-2 hours, the soil ratio in the seedling matrix is 50%, the seedling height can be cultivated ≤ 18 cm, with 5-6 leaves, and the seedling age is 30-40 d. Mechanically transplant seedlings to achieve factory production.At the 2-3 leaf stage of rapeseed seedlings, spraying with 50-100 mg/L liquid medicine can reduce the height of the seedlings, increase the thickness of the young stems, the leaves are small and thick, the petioles are short and thick, the number of green leaves per plant and the content of chlorophyll. The ratio of root to shoot is improved, and the seedling is strong.After transplanting in the field, the height of the effective branch position decreased, the number of effective branches and the number of angles per plant increased, and the yield increased by about 7.9%.
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