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Chinese Agricultural Science Bulletin ›› 2015, Vol. 31 ›› Issue (12): 12-24.doi: 10.11924/j.issn.1000-6850.2014-2273

Special Issue: 小麦

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Influence of Soil Moisture on Main Morphological Characteristics of Winter Wheat

Li De1, Ma Xiaoqun2, Sun Yi1, Sun Youfeng1   

  1. (1Meteorological Bureau of Suzhou in Anhui Province, Suzhou Anhui 234000;2Institute of Meteorological Science of Anhui Province, Hefei 230061)
  • Received:2014-08-20 Revised:2014-08-20 Accepted:2014-09-29 Online:2015-05-06 Published:2015-05-06

Abstract: Determining the influence of soil moisture on the main morphological parameters like plant height, leaf area index (LAI) and dry matter weight of seedling of winter wheat is an important basis of variety breeding, improvement of water saving cultivation measures and establishment of relevant crop monitoring and evaluation model. To discuss the influence of soil moisture on the main morphological characteristics of winter wheat, the field moisture control experiment was developed in 3 years based on the wheat varieties ‘Wanmai 52’. The green stage, jointing stage and heading stage were studied and canopy was used to control the field water in the experiment. The correlation analysis, regression statistics and so on were used to discuss the influence of soil moisture change on plant height, leaf area index (LAI) and dry matter weight of seedling of winter wheat in different growth period. Results showed that: soil moisture change in the green stage, jointing stage and heading stage would all cause the change of plant height, LAI and dry matter weight of seedling. Especially, the soil moisture in jointing stage had the most significant influence on the plant height in heading stage; soil moisture from jointing stage to heading stage had a most significant dry matter weight of seedling. The influence of soil moisture on the main morphological parameters could be expressed with linear regression equation with one unknown or quadratic regression equation in one unknown. The appropriate relative soil moisture index at which the main morphological parameters could reach their appropriate value or optimal value was around 70%. Drought in different growth period would all cause the reduction of plant height, LAI and dry matter weight of seedling to some extent. The reduction would persist, what’s more, the earlier the drought occurred, the longer the reduction persisted. The results achieved in the research could provide reference for variety breeding and improvement of water saving cultivation measures. The equation established in the research could be used to monitor and evaluate the quantitative influence of soil moisture change on plant height, LAI and dry matter weight of seedling.