Cold damage prevention and control methods and key technical points for rice at the panicle elongation stage

Rice pollination at the panicle elongation stage greatly needs temperature and oxygen. During this period, cold winds blowing from the northeast are very likely to occur, causing poor pollination, empty and shriveled grains, and reduced yield.

Prevention and control techniques for cold damage.

First, accelerate rice pollination. From late July to early and mid-August, due to meteorological causes of atmospheric circulation, the temperature generally drops to around 17, causing rice flowers to remain closed and not open, affecting rice pollination and producing empty and shriveled grains. For this kind of obstructive cold damage, scientific management of the paddy field should be strengthened so that rice accelerates through the pollination period, avoids the attack of cold winds, and yield increase is ensured.

Second, artificial rope pollination. Two people can pull a rope (soft hemp or cotton rope, 7-9 mm in diameter) in parallel, so that pollen grains fly up and pollination proceeds smoothly.

Third, irrigate with deep water to protect pollination. Listen carefully to the weather forecast. Before the cold wind is about to blow, quickly irrigate the paddy field with 17-20 cm of deep water to improve the rice's ability to resist cold wind so that rice pollination is not affected.

Fourth, apply panicle fertilizer reasonably. While applying nitrogen fertilizer, spray potassium dihydrogen phosphate and some acidic solutions, the purpose being to promote full and mature rice grains.

Fifth, remove large weeds and dry the field. Large weeds, especially barnyardgrass, should have their panicles cut off with a sickle to prevent the large weeds from shading light and hindering rice growth. After avoiding the cold wind, dry the field so that the rice root base is firm and lodging of rice is prevented.