极端气候条件下湖北稻茬小麦适宜播量研究

Study on Suitable Seeding Rate of Wheat Planted in the Harvested Rice Fields under Extreme Climate Condition in Hubei Province

摘要: 在2017~2018年度极端气候条件下，采用田间试验研究了播量对湖北稻茬小麦产量、产量性状及赤霉病发生情况的影响。结果表明：在播量5~25 kg/667m²范围内，随播量的增加小麦基本苗、冬至苗及最高苗呈现增加趋势，有效穗先增加后下降，穗粒数和千粒重呈递减趋势，但千粒重下降幅度小于穗粒数下降幅度；小麦赤霉病病穗率和病指随播量的增加而增加；试验条件下，稻茬小麦最佳播量在15.3 kg/667m²~18.8 kg/667m²之间，可获得的最高产量在325.2 kg/667m²~364.8 kg/667m²之间。

Abstract: Field experiments were conducted from 2017 to 2018 under extreme climate condition in Hubei Province. The objective of the research was to investigate the effects of seeding rate on grain yield, yield components and wheat scab. The results showed that in the range of 5~25 kg/667m², basic seedling, total tillers and the highest tillers were positive correlated with the seeding rate. There were first increasing and then decreasing trends of effective spikes, and decreasing trends of grains numbers per spike and 1000-grain weight with increasing seeding rate, but the decline in 1000-grain weight was less than grains numbers per spike. The disease severity of wheat scab was positive correlated with the seeding rate. Under the experimental condition, the optimum seeding rate for wheat planted in the harvested rice fields was 15.3~18.8 kg/667m², and high yield could be obtained with 325.2 kg/667m²~364.8 kg/667m².