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Quantitative Evaluation of Soybean Drought System Sensitivity based on Relative Growth Rate(PDF)

《大豆科学》[ISSN:1000-9841/CN:23-1227/S]

Issue:
2018年01期
Page:
92-100
Research Field:
Publishing date:

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Title:
Quantitative Evaluation of Soybean Drought System Sensitivity based on Relative Growth Rate
Author(s):
JIANG Shang-ming 1;  YUAN Hong-wei 1; CUI Yi 2;  JIN Ju-liang 3; 4;  ZHANG Yu-liang 5;  ZHOU Yu-liang 3;  4
（1.Key Laboratory of Water Conservancy and Water Resources of Anhui Province, Water Resources Research Institute of Anhui Province and Huaihe River Commission, Ministry of Water Resources, Hefei 230088, China; 2. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China; 3. School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; ）
Keywords:
Drought system sensitivity; Growth analysis method; Relative growth rate; Degree of drought stress; Soybean drought test
PACS:
S565.1;S274.3
DOI:
10.11861/j.issn.1000-9841.2018.01.0092
Abstract:
In allusion to the complexity and importance of quantitative evaluation for soybean drought system sensitivity, relying on agricultural water comprehensive test station of Xinmaqiao to carry out special soybean potted drought stress tests with anti canopy. Analysis of drought stress of soybean at different growth stages on dry matter accumulation of root and shoot and root-shoot ratio. The sensitivity function of soybean drought system based on relative growth rate (RGR) was constructed by crop growth analysis method. And then to achieve a quantitative assessment of the sensitivity of soybean drought system.The results indicate that soybean seedlings under drought stress will be a relatively large growth rate of the reduction. But with the increase of drought stress, the inhibition of soybean growth and dry matter accumulation was not obvious. And drought stress can stimulate itself to adapt to the mechanism of drought stress beneficial to the late growth and development. Appropriate control of water supply at seedling stage to ensure that all seedlings. Soybean drought system is more sensitive in branching period. But the growth period of mild drought stress on soybean growth effect is not obvious. It is necessary to ensure that the water supply during branching period is higher than the mild drought stress， then the soil moisture can content more than 55% of field capacity moisture content to protect soybeans thrive. Soybean flowering-poding period requires the most in water and nutrient, the drought system sensitivity of this growth period is also relatively large, especially when serious drought stress system sensitivity is the largest. It is necessary to fully guarantee the water supply during flowering-poding period that the soil moisture content more than 75% field capacity moisture content. Because the vegetative growth and the accumulation of dry matter are almost stagnant in soybean mature period, the drought system sensitivity is minimal that base on the relative growth rate of total dry matter. But soybean mature period is the critical period of soybean yield formation, it is necessary to fully guarantee the water supply during soybean mature period that the soil moisture content more than 75% of field capacity moisture content.

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Last Update: 2018-03-13