主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

Journal of Meteorology and Environment ›› 2021, Vol. 37 ›› Issue (5): 86-92.doi: 10.3969/j.issn.1673-503X.2021.05.013

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Impact of soil water stress from pod filling to maturity on seed setting and yield of spring soybean

Xiu-fen LI1,2(),Shu-qing MA3,4,*(),Hai YU5,Li-ping XU5,Feng-tao CHEN5,Li-juan GONG1,2   

  1. 1. Heilongjiang Province Institute of Meteorological Sciences, Harbin 150030, China
    2. Innovation and Opening Laboratory of Regional Eco-Meteorology in Northeast China, CMA, Harbin 150030, China
    3. Meteorological Observatory of Jilin Province, Changchun 130062, China
    4. Meteorological Service Center of Jilin Province, Changchun 130062, China
    5. Yushu Meteorological Service, Yushu 130400, China
  • Received:2020-08-01 Online:2021-10-30 Published:2021-11-01
  • Contact: Shu-qing MA E-mail:ge-2003@163.com;jlmasq@aliyun.com

Abstract:

In order to clarify the effect of drought in late growth on yield formation of spring soybean, and to provide the scientific basis for summer-autumn drought assessment and drought control irrigation, soil moisture control experiments consisting of seven soil moisture levels and one natural rain-fed treatment from pod filling to maturity were carried out in central Jilin province in 2017 and 2018, and soil moisture, pod bearing rate, empty-chaff pod rate, grain weight and yield were observed. The effects of soil moisture on soybean yield were analyzed by the regression method. The results showed that under the field capacity, the grain weight and yield of soybean are linearly positively correlated with the soil moisture during the period of pod filling to maturity, and the number of soybean pod bearing and the relative empty-chaff pod rate and the soil moisture are related in quadratic function. If the soil moisture during pod filling to maturity in 0-30 cm soil depth decreases by 1 percentage point, the number of soybean pods and the number of effective pods decrease by 3.1 and 3.7 percentage points respectively, and the relative 100-kernel weight and relative yield per unit area decrease by 0.8 and 1.5 percentage points respectively, and the empty pod rate increases by 9.3 percentage points. In this period, soybean likes water but has strong drought tolerance. Soil moisture between 22% and 23% is beneficial to reducing empty-chaff pod rate, and increasing pod number, grain weight, and yield. The soil relative humidity indexes for light, moderate, severe drought and extreme drought are 66%-75%, 57%-65%, 50%-56% and below 50%, respectively, and the corresponding yield reduction rates are 5%-10%, 11%-15%, 16%-20% and more than 20% respectively. Compared with the previous indexes, the indexes of severe and extreme drought in this experiment are significantly higher than wilting humidity, which is more in line with the physiological law of soybean water demand and can be used for quantitative assessment of drought effects on spring soybean during the period of filling and ripening.

Key words: Spring soybean, Water stress, Yield, Correlation model, Summer-autumn drought index

CLC Number: