No delay in the birth process of wheat without spraying ethephon
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The relevant person in charge of the planting station in Yancheng City told reporters in a telephone interview on the postponement of the wheat harvest. He said that in the spring and rainy days this year, the birth process in the early wheat period was later than usual. Currently, the large area of ​​wheat in the area is in the grain filling period. Rainfall occurs, which slows the speed of grain filling and delays harvesting. From the perspective of wheat heading later than normal, the harvest period may be delayed by 5-7 days from the normal year. However, in the late grouting period, if hot dry wind happens, there is a possibility of high temperature ripening, which will make large areas of wheat mature rapidly in the same period.
The phenomenon of high temperature ripening is a natural disaster and has a great impact on wheat yield. It is understood that the suitable temperature for wheat grouting is 20-22°C. Higher than 22°C is not conducive to grouting, and grouting beyond 28°C basically stops. When wheat reaches the high temperature above 27°C during the filling stage, it will cause the transpiration intensity of the plant to increase greatly and the water will not be able to make enough. The high temperature will also cause the loss of stomatal closure ability of the wheat leaves, accelerate the leaf dryness, inhibit the photosynthesis and cause high temperature ripening. If the wheat suffers from wet damage, premature aging of the root system occurs, water absorption and absorption capacity decrease, and high temperature ripening will become more serious. In particular, when wheat enters the milk season, the weather with a maximum temperature of more than 30°C after continuous precipitation will cause the sudden acceleration of wheat death and a significant decrease in the number of grains, resulting in a reduction in production.
In the wheat booting stage to the heading stage spray with 40% ethephon solution 250-800 times, with control of high anti-downside effect. However, according to tests by Guo Pingyi et al. of Shanxi Agricultural University, the use of ethephon in the jointing stage of wheat will reduce the number of panicles and reduce the 1000-grain weight, which may result in a production reduction of more than 10%. This is because the ripening effect of ethephon is accelerated dehydration, prompting Organ aging. At present, there is still a period of time before the wheat harvest. The weather conditions in the later period are still unknown, and it is uncertain whether the harvest will be postponed. It is recommended not to use ethephon ripening so as not to affect the yield.
Whether the delay in wheat harvesting will not affect the timely sowing of wheat direct seeding rice, the relevant person in charge of the planting station in Yancheng City said that the local large-area wheat crop was harvested before and after June 10 in previous years, if this year postpones harvesting by 5-7 days, Then it will be completed before June 17. In the Yancheng area, Lianjing No. 6 and other middle-maturing japonica rice varieties were used as direct-seeded rice plantation. As long as the sowing was completed before June 20th, there was no significant impact on the safety of panicles.