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The specific method is: in the rice one leaf and one heart period, 15% paclobutrazol 100 mg / kg per acre is sprayed evenly on the rice seedlings. The rice seedlings sprayed with paclobutrazol showed the following changes compared with the control:
After the spraying of paclobutrazol in the seedlings, the seedlings are divided early, the plants become shorter, the performance is robust, the leaves are quite, and the stems become shorter. The rice seedlings sprayed with paclobutrazol were 2.8-3.6 cm shorter than the control, the leaves were 3.2-4.5 cm shorter, the leaves were 0.04 cm wide, and the tillers increased by 0.9-1.8.
The roots of the rice roots are well developed, the roots of the rice seedlings are obviously developed, the white roots are many, the roots are long and thick, the coefficient is 2.5-3.5, the white roots are 3.8-6.4, and the roots grow. Exuberant, after transplanting, the anti-green is 3 to 4 days earlier, the drought tolerance and cold resistance are enhanced, and the incidence and degree of disease are significantly reduced.
The effective tillering rate increased the seed setting rate and the seed setting rate significantly increased. The spraying of paclobutrazol in rice seedlings occurred earlier and more, and the effective tillering increased significantly. The later leaves were clear and straight. The experiment showed that the number of effective panicles per mu increased by 1 to 17,000, the rate of ear formation increased by 3% to 4.5%, the number of grains per ear increased by 3.5 to 3.7, and the seed setting rate increased by 2.5. %~4.8%.
The yield is obviously improved. The cost of using paclobutrazol is low and the benefit is high. Generally, the yield per mu can be increased by 20-40 kg. The application of paclobutrazol in rice breeding can not only produce strong sorghum, but also dwarf seedlings, and it is quick and quick to transplant, and the number of effective panicles increases, the seed setting rate and 1000-grain weight increase. It can be said that spraying paclobutrazol at rice seedling stage is simple. An effective way to increase production, such as easy operation, low investment, and high production.
Paclobutrazol is a highly active plant growth retardant and a broad-spectrum fungicide. According to the current problem of easy lodging, lack of seedling and insufficient tillering in rice seedling stage, if paclobutrazol is applied in rice seedling stage, it will be obvious. Improvement.
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