ACTA AGRICULTURAE BOREALI-SINICA ›› 2021, Vol. 36 ›› Issue (3): 150-158. doi: 10.7668/hbnxb.20191791

Special Issue: Rice Drought and water saving

• Resources & Environment·Plant Protection • Previous Articles     Next Articles

Effects of Nitrogen Application on Yield and Physiology of Late Rice under Drought Condition

HUANG Huixian, SHEN Tianhua, ZHONG Lei, DU Jie, FU Junru, ZHOU Dahu, HE Haohua, CHEN Xiaorong   

  1. School of Agricultural Sciences, Jiangxi Agricultural University, Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Research Center of Super Rice Engineering and Technology, Jiangxi Province, Collaboration Center for Double-season Rice Modernization Production, Nanchang 330045, China
  • Received:2021-03-14 Published:2021-06-28

Abstract: In order to explore the effect of nitrogen management on double cropping super rice late rice under drought conditions.Wufengyou T025, a super hybrid late rice variety, was selected. Under the normal or drought conditions at the young panicle differentiation stage, the yield and related physiological and ecological indexes were investigated by applying more nitrogen tiller fertilizer (before drought) and nitrogen panicle fertilizer (after drought).The results showed that:Drought lead to a significant decrease in rice yield, and the young panicle differentiation stage was the sensitive stage of water deficit in late rice. Under the condition of normal water or drought conditions, the yield of higher tiller fertilizer application was significantly higher than that of higher panicle fertilizer application, and the tillering stage was the key period for nitrogen requirement of late rice. The effective panicles per plant and seed setting rate of higher tiller fertilizer application were significantly higher than those of higher panicle fertilizer application. Compared with the application of higher nitrogen tiller fertilizer, the photosynthetic rate (Pn), transpiration rate (Tr) and other photosynthetic indexes of higher panicle fertilizer application were increased in different degrees at heading and flowering stages, but the nitrogen and dry matter transport rate of stem and leaf to panicle was low. The retention was serious, and the nitrogen transported to the panicle was relatively low. The contents of osmotic adjustment substances and the malondialdehyde (MDA) content in leaves decreased in the late growth stage, and the activities of nitratase (NR) and glutamic-pyruvic transaminase(GPT) increased in the short term after drought for higher tiller fertilizer application.Therefore, there is a certain effect of "regulating water with nitrogen" in rice. Properly increasing the ratio of nitrogen fertilizer at tillering stage can reduce the yield loss of late rice caused by drought stress at young panicle differentiation stage.

Key words: Rice, Nitrogen application, Drought, Yield, Physiology

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Cite this article

HUANG Huixian, SHEN Tianhua, ZHONG Lei, DU Jie, FU Junru, ZHOU Dahu, HE Haohua, CHEN Xiaorong. Effects of Nitrogen Application on Yield and Physiology of Late Rice under Drought Condition[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(3): 150-158. doi: 10.7668/hbnxb.20191791.

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