Differences in Growth and Yield Traits for Winter Wheat under Different Sowing Dates in Typical High Temperature Year

doi:10.3969/j.issn.1000-6362.2018.09.006

Abstract

Abstract: The experimental data of winter wheat stage sowing under natural high-temperature conditions in 2016-2017 was used to analyze the differences in stages of sowing, growth and yield factors by variance analysis, chi?square test, least significant difference, and Logistic equation simulation. The results showed that the winter wheat in different sowing dates had large differences in development stages before winter. After wintering, with the increase of temperature, the development of winter wheat in each sowing date tended to be consistent. With the delay of sowing date, the accumulated temperature decrease trend was obvious before winter, the growth factors such as plant height, green leaf area and plant density showed a significant decrease tendency. The fertile spikelets and infertile spikelets of winter wheat showed a significantly decreasing trend, and the number of grains per panicle had no significant difference. The 1000?grain weight of winter wheat was extremely significant difference in different sowing dates. Among them, 1000-grain weight of in advance 10 days sowing was significantly lower than that of the control treatment, and postponed sowing was not significantly different from the control treatment. The yield of control treatment was the highest. The grain filling process of winter wheat was consistent with Logistic growth law in different sowing dates. For control treatment, the grain increasing period was longer than that of other sowing dates, which will help increase the grain “storage capacity” of winter wheat, and the grain filling rate was fast in the fast growing period, which helps to increase the grain weight. With the delay of the sowing date, there was no obvious regularity in the variation of the filling rate and duration, and the filling process of the control treatment was relatively stable.

Key words: High temperature, Winter wheat, Grain filling process, Logistic curve, Different sowing dates, Yield difference

XIN Zhi-hong，GUO Jian-ping，TAN Kai-yan. Differences in Growth and Yield Traits for Winter Wheat under Different Sowing Dates in Typical High Temperature Year[J]. Chinese Journal of Agrometeorology, 2018, 39(09): 601-610.

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