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Rapeseed wants high yield, and the rational use of plant growth regulators is critical. Next, we will introduce you to the use of plant growth regulators in detail.
Methods for using plant growth regulators to increase rapeseed yield:
1, gibberellin
Rooting with 20mg/L gibberellin can be used to promote early plant growth and increase yield before transplanting rapeseed. It is also possible to increase the seed setting rate of rapeseed by applying 25kfismg/L gibberellin solution at the flowering stage. The liquid preparation can be dissolved with 85% gibberellin powder 1g plus 60 degree liquor and then add 34L water.
2. Paclobutrazol
For the 5 seedlings, the seedlings should be sprayed with 15% paclobutrazol wettable powder 30-35g and water 60-75kg per 667m2 in a timely manner. The sprayed seedlings promote shortness and increase yield by 15.2%. Pre-winter treatment, when rapeseed leaves age 6-7 leaves treated with 40mg/L paclobutrazol solution, can increase leaf green number, leaf area per plant deepen leaf color, reduce plant height, antifreeze and cold resistance, one effective branching ratio One increase in the control, the effective branch of the first branch increased by 11.2 compared with the control, and the yield increased by more than 13%. After spring, in the initial stage of rapeseed, sprayed with a concentration of 40 mg/L of paclobutrazol solution, the effective branch was increased by 1.5 compared with the control, and the effective branch of the first branch increased by 19.6, which also increased yield by 13%. In the 2 leaf stage of the vegetable seedlings and 15 days after planting, 0.5 kg of boron fertilizer was applied per 667 m2, and 15 g of 15% paclobutrazol wettable powder and 40 kg of water were sprayed. After treatment, the rhizome thickness, fresh weight and dry weight per plant can be significantly increased, and the net photosynthetic rate of the leaves can be increased, and the yield is increased by 14.4%.
3. Brassinolide
Spraying 0.004% Brassinolide in the bud stage and the initial flowering stage, spraying with 13.2ml of water and 60kg per 667m2 each time, can increase the stem diameter of the plant, the number of spindle branches, the number of pods per branch, and each The number of pods, the seed setting rate and the 1000-grain weight, the yield of the increased plants were 4.47 g and the yield of 667 m2 was 22.7 kg, which increased yield by 14.5%. The Brassinolide in the flowering stage and the initial stage of the pods was sprayed once, the concentration was 0.3-0.5 mg/L, and the amount of liquid per 667 m2 was 50 l, which increased the number of pods per pod, the number of pods and Thousands of grains weight, more than 10% increase than the water.
4, triacontanol
For vigorously growing rapeseed, spraying the leaves with a concentration of 0.5 mg/L of triacontanol at the beginning of the flowering is beneficial to increase the seed setting rate and 1000-grain weight. For plants that grow in general, the same concentration of triacontanol can be sprayed once during the pumping period to increase the length of the main inflorescence, which can generally increase yield by 10%-15%. It is better if the triacontanol powder is used. For the field with serious boron deficiency, a mixture of borax and triacontanol can be sprayed, and the yield increasing effect is also obvious.
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