Effects of Planting Population under Poor Light on the Canopy Temperature and Humidity and Grain-filling Properties of Winter Wheat

doi:10.3969/j.issn.1000-6362.2019.05.004

Abstract

Abstract: To study the effects of planting population under poor light on the canopy temperature, humidity and grain-filling properties of winter wheat, a white nylon mesh with a light transmittance of 50% was used to simulate the shading environment from jointing to maturity of winter wheat in 2016, a two factors split-plot field experiment including five plant population: 4.5 (M1), 5.25 (M2), 6.0 (M3), 6.75 (M4) and 7.5 million plants·ha?1 (M5) were conducted at circumstance of natural light and shading to observe and compare the variation of canopy temperature, humidity and grain filling characteristics of winter wheat. The results showed that, compared with natural light, the canopy temperature of winter wheat was significantly reduced under shading treatment, and the duration of high temperature at noon was significantly shortened. Under shading treatment, the canopy humidity increased significantly, the duration of humidity low valley at noon was shortened, and the grain filling rate, effective panicle number, grain weight per spike and 1000-grain weight were all decreased. Thus, under shading conditions, high yield could be obtained by appropriately reducing the planting population, improving the temperature and humidity of the canopy, increasing the grain filling rate, grain number per spike and 1000-grain weight.

Key words: Poor light, Planting population, Winter wheat, Temperature and humidity, Grain-filling properties

ZHANG Yong-qiang，CHEN Chuan-xin，FANG Hui，SAILIHAN Sai，XUE Li-hua，CHEN Xing-wu，LEI Jun-jie. Effects of Planting Population under Poor Light on the Canopy Temperature and Humidity and Grain-filling Properties of Winter Wheat[J]. Chinese Journal of Agrometeorology, 2019, 40(05): 301-307.

References

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