Control vigorous rice growth and prevent lodging
隐藏域元素占位
Control vigorous rice growth and prevent lodging
Application of regulators to control vigorous rice growth and prevent lodging.
Prohexadione Calcium
In Anhui and Jiangsu, the experiments on three varieties of "Huiliangyou No. 6", "Wuyunjing No. 8" and "C Liangyou 343" showed that spraying 75-125 mg/ L in the rice seedling stage prohexadione calcium solution, can shorten the base node spacing, effectively control the prosperous growth, reduce lodging, and increase the yield by 5% on average. The effect of prohexadione on rice yield did not work in one aspect, but in many aspects, such as 1000-grain weight, seed setting rate, and ear length.The effect of prohexadione calcium on the number of ears per mu, total grain number, thousand-grain weight and seed setting rate of the three kinds of rice did not show a certain regularity, and the effects of different daily concentrations were also different on different varieties.
Paclobutrazol
Paclobutrazol has the effect of delaying the growth of continuous-cropping late rice seedlings, controlling stem and leaf elongation, preventing leggy growth, promoting root growth, increasing leaf division, enhancing photosynthesis, benefiting multi-leaf and strong seedlings, increasing the elasticity of seedling age, and preventing seedlings after transplanting. Destroyed seedlings," and so on. Paclobutrazol is mainly suitable for the continuous cropping of late rice seedlings. Spraying with paclobutrazol 300 mg/I liquid at the 1 leaf and 1 heart stage of the seedlings can increase the seedlings and control the plant height. According to the experiment in Xiaoshan City, the average height of continuous-cropping late rice seedlings treated with paclobutrazol 300 mg/L was 31.4 cm, which was 70%-75% of the control, and the growth rate was 21.7%. The number of leaves per plant was 0.97, an increase of 1.85 times compared with 0.34 in the control. At the same time, the seedlings showed a strong root system, more white roots, and strong rooting power.
Spraying 100~300 mg/L 15% paclobutrazol WP 7d before jointing, booting stage, heading stage and full grain filling stage of rice can effectively inhibit its plant height. As far as the spraying period was concerned, the heading period was the most sensitive to spraying, and the average plant height was 14.9% shorter than that of the control sprayed with water.From the analysis of the influence of comprehensive factors such as biological characteristics and yield of rice, the treatments of spraying 300 mg/L 7 days before jointing and spraying 100 mg/L at booting and heading stage were more moderate, and their plant heights were reduced by 12.63% compared with the control. % and 11.0%, the yield increased by 6.9% and 11.2% compared with the control.However, after the multi-site and multi-variety experiments were verified, paclobutrazol was applied at the booting stage, heading stage and grain-filling stage. When the concentration was too high, it was easy to affect panicle formation and panicle development, resulting in yield reduction. Therefore, it is recommended to apply it 7-10 days before rice jointing.
Ethephon
Spraying 500 mg/L ethephon at the 4-leaf stage of early rice seedlings has a certain effect on improving the quality of seedlings. However, ethephon soaking and spraying ethephon at the 3-leaf stage of late rice will not only make the seedlings dwarfed and the largest leaves become shorter and narrower, but also adversely affect the quality of the seedlings, which is worth noting.(Note: Strictly control the concentration of use, choose a sunny day with a temperature of 20~30°C for spraying; ethephon is decomposed by alkali and cannot be mixed with alkaline pesticides.)
Adjust the ring.
Uniconazole
At the early stage of rice jointing, 15% of the ring is applied. The water dispersible granules of unconazole 18.0~22.5g/hm2 can reduce the plant height of rice by 8.9%~14.6% and increase the yield by 6.1%~8.0%.
Growth Stage Products
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