During the period from “equinox†to “cold dewâ€, the northern cold air frequently flies southwards, and the average daily temperature is usually less than 22°C for more than three days in a row, accompanied by strong wind and rainy weather. Farmers often call this kind of weather “ Cold dew." Trenbolone Enanthate,Anabolic Steroids Powder,Steroid Powder Hormone/Steroides Co., Ltd. , http://www.hbsteroids.com
Hybrid late rice encounters “cold dew†at the heading stage, which will cause the heading speed to slow down and the full heading period to be delayed. Even the emergence of no panicles will cause the formation of necks. In the flowering period, “cold dew-wind†will cause delayed flowering and anthers. Can not be normal cracking, can not normally loose powder, can not be normal by the powder, forming a shell; in the grouting period meet the "cold dew wind", will form a cereal valley, reduce the weight of 1000, resulting in serious reduction in production. Therefore, the defense against the "cold dew wind" hazard is an important part of seizing the high yield and stability of hybrid late rice. Some of the following emergency defense measures should be taken.
1. Irrigation and deepwater irrigation in deep water before the arrival of “cold dew wind†to adjust temperature with water and increase soil temperature and near-surface temperature in paddy fields can effectively reduce the damage of low temperature. According to the determination, before the arrival of “cold dew windâ€, 8 cm to 10 cm of deep water is poured, and the soil temperature of rice fields can be increased by 1°C to 2°C. Therefore, we should rush to deepen the paddy field water layer before the arrival of “cold dew windâ€.
2. In the “cold dew-wind†period, the activity of late rice roots weakened, which affected the absorption of nutrients and water, and reduced the ability to resist cold. Therefore, before the advent of “cold dew windâ€, fertilizer should be applied once in a timely manner, 0.2 kg of potassium Dihydrogen Phosphate, or 0.5 kg of urea, 0.5 kg of superphosphate, 75 kg of water added to the leaves, or foliar spray. While protecting the cold water in deep water, 750 kg to 1000 kg of plant ash per acre can enhance the cold resistance of rice plants, favoring heading, flowering and pollination, increasing seed setting rate and increasing grain weight.
3. Spraying “90%†before the arrival of “cold dew-curdâ€, timely spraying “90%†on late rice that is expected to fail to be safe. The spraying time is expected to be 5 days to 7 days before the panicle start, concentration 20ppm ~ 30ppm, per acre with "92000" 1g ~ 1.5g, add water 60 kg ~ 75 kg spray foliar, both to reduce the package The degree of neck can also promote the safety of late rice.