Effect of flooding duration at different growth stages on growth and yield components of rice

SHAO Changxiu1 PAN Xuebiao1 LI Jiawen2 WEI Pei1 ZHANG Xuting3 HU Qi1 REN Jianhong1

(1.College of Resources and Environmental Sciences, China Agricultural University, Beijing, China 100193)
(2.Liuzhou Meteorological Bureau, Liuzhou, China 545001)
(3.Shaanxi Meteorological Observatory, Xi’an, China 710014)
【Knowledge Link】path analysis

【Abstract】Flooding is one of main disasters for agricultural production in China. Its influence on rice is rarely studied in Guizhong District in Guangxi. In this study, we investigated the effects of different flooding durations at different growth stages on the growth and yield components of rice. The experiment was carried out in Nalu Village of Laibing City, Guangxi, China (109°52’ E, 24°4’N). The soil was sandy loam. As early and late rice, Sixiang 1 and Baixiang 139 were planted in pots in 2015 and 2016, respectively. Flooding of early rice started at different growth stages of tillering, booting and flowering. At each growth stage, flooding lasted for 0 (control), 2, 4, 6, 8, and 10 days, respectively. Because the precipitation during the booting and flowering stages of late rice was small, the flooding of late rice was carried out on three different days at tillering stage. At flooding, the water surface remained 2–3 cm higher than the plant height. The flooding duration of late rice was same as that of early rice. During the experiment, the tiller numbers before and after flooding, the heading stage time and its duration, grain number per panicle, seed-setting rate, 1 000-grain weight and yield per pot after harvest were determined, and the relationships between yield and yield components were subjected to path analysis. The results showed that the seedling death rate was less than 7.5% when the flooding duration at the tillering stage was less than 2 days, which was not significantly different from control. As the flooding duration increased to 4–10 days, the death rate increased. When the flooding lasted more than 6 days, the death rate of early rice could reach more than 80% and even 100%. The death rate of Sixiang 1 reached 50% after flooding for 6 days while it was still smaller than 50% for Baixiang 139 after flooding for less than 10 days. The death rate was below 40% for the treatment of flooding at flowering stage. The initial heading stage time of flooding for 8 days was postponed compared with that of the control when flooding at different growth stages, and the heading duration was also prolonged. The yield was not significantly decreased when the flooding at the tillering stage lasted less than 4 days, but flooding for 6 days could result in the reduction of yield by 80% and flooding for 8–10 days could result in the death of plants. The yield reduction rate of flooding for 2 days at the booting and flowering stages was higher than 50%. The path analysis of yield components showed that the yield was mainly affected by effective panicles, seed-setting rate and 1 000-grain weight for the flooding at the tillering stage, by seed-setting rate, number of grains per panicle and 1 000-grain weight for the flooding at the booting stage, and by effective panicles and seed-setting rate for the flooding at the flowering stage, respectively. The study provides important information for formulating the flooding disaster warning system and management methods of double-cropping rice in Southwest China.

【Keywords】 flooding; stress; path analysis; rice; heading stage of rice; yield;

【DOI】

【Funds】 National Key Research and Development Project of China (2017YFD0300401) National Basic Research Program of China (973 Program) (2013CB430205)

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(Translated by LIU T)

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This Article

ISSN:1002-6819

CN: 11-2047/S

Vol 35, No. 03, Pages 125-133

February 2019

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Abstract

  • 0 Introduction
  • 1 Materials and methods
  • 2 Results and analysis
  • 3 Discussion
  • 4 Conclusions
  • References