Effect and Application of paclobutrazol on Rice

Paclobutrazol is a highly active plant growth retarder and broad-spectrum fungicide. The physiological effects of pp333 in the world and MET in China are mainly dwarfing, promoting tiller and improving stress resistance. Moreover, it is a simple, easy and effective measure to increase yield by turning green quickly, tillering early, increasing the number of effective panicles, seed setting rate and 1000-grain weight.

After experiments in various parts of Liaoning Province in recent years, it was found that there were the following changes in the zole yield of rice seedlings compared with the control.

1. The seedlings are getting shorter. After spraying paclobutrazol at the seedling stage, the rice seedlings turn green and become shorter, the seedlings are strong, the leaves are tall, and the stems become shorter. Generally, the seedlings are 3.4-4.8 cm shorter than the control, the leaves are 3.2-5 cm shorter, and the leaves are about 0.04 cm wide. The number of tillers increased by 0.9-1.8.

two。 The root system is well developed and the stress resistance is enhanced. The seedlings sprayed with paclobutrazol had developed roots, many white roots, stout and long milk. The total number of roots is 2.5-3.5, and that of white root is 3.8-6.4. The root system activity is exuberant. After transplanting, it turned green 34 days earlier, with strong drought resistance, cold resistance and mild disease.

3. The effective tillering rate is increased, the panicle rate is high, and the seed setting rate is high. In the seedlings of paclobutrazol, the tillering occurred early, the tillering rate increased, and the leaves were straight. According to the survey, the number of effective panicles per mu increased by 1-27000, and the panicle rate increased by 2.5% and 4.8%.

4. The output has increased. Increase production by 20-40 kg per mu.

Methods of using paclobutrazol in raising rice seedlings:

1. Spray time. Soak seeds or spray at 1 leaf and 1 heart stage of seedlings.

two。 Dose standard. According to local experiments and application results, generally 15% paclobutrazol per mu 100-150 grams, mixed with water 50 kg, evenly sprayed on the seedlings.

3. Points for attention. Drain water and drain the seedling field one day before spraying. Most of the seedlings in Liaoning are raised in drought, and there is no water in the seedling period. After spraying! Rehydration day and night, normal management, spray on the day of rain to re-spray, but the amount of medicine can be reduced, spray in the process to operate agitation liquid, spray while stirring.

It is strictly forbidden to prepare the concentration and dosage of multi-acting azole solution according to the operating instructions, excessive inhibition of plant growth, resulting in a reduction in yield.