PLOUGH PAN IMPACTS MAIZE GRAIN YIELD, CARBON ASSIMILATION, AND NITROGEN UPTAKE IN THE CORN BELT OF NORTHEAST CHINA

  • Qing jun Cao Jilin Academy of Agriculture Science/Key Laboratory of Northeast crop physiology ecology and cultivation, Ministry of Agriculture in People’s Republic of China,
  • Gang Li Jilin Academy of Agriculture Science/Key Laboratory of Northeast crop physiology ecology and cultivation, Ministry of Agriculture in People’s Republic of China
  • Fen tuan Yang Jilin Academy of Agriculture Science/Key Laboratory of Northeast crop physiology ecology and cultivation, Ministry of Agriculture in People’s Republic of China
  • Xiao li Jiang Jilin Academy of Agriculture Science/Key Laboratory of Northeast crop physiology ecology and cultivation, Ministry of Agriculture in People’s Republic of China
  • Lamine Diallo College of Plant Science, Jilin University, Changchun 130062, P.R China
  • Feng xi Chen Jilin Academy of Agriculture Science/Key Laboratory of Northeast crop physiology ecology and cultivation, Ministry of Agriculture in People’s Republic of China

Abstract

This study aims to investigate the responses of carbon assimilation, grain yield, leaf stay-green rate, nitrogen uptake and distribution to soil compaction in the hard plow pan caused by repeated use of tractor-driven cultivator in Northeast China. The typical hybrid maize variety “Zhengdan 958” was exposed to two treatments of simulated plow pan (SP) and simulated subsoiling (SS, control) in pot experiments from 2012 to 2014. Compared with SS, SP significantly reduced net photosynthetic rate (Pn) during growth stage, leading to a decrease in dry matter accumulation (DMA) and grain yield (GY) in three consecutive experimental years. Leaf stay-green degrees (LSD), which showed a fast descending trend from 20 days after silking (DAS), significantly decreased in the later filling stage under SP treatment. The translocation efficiency of the stored N (TEN) in stalk and leaf to the grain during pre-silking was enhanced, whereas leaf and grain N concentration (LNC/GNC), together with N accumulation amounts at maturity were significantly reduced under SP treatment. Also, plough pan reduced the N distribution to the organs of stalk, leaf and grain. In conclusion, subsoiling is a possible way to delay leaf senescence and achieve higher DMA and GY, and increased grain N in the corn belt of Northeast China.

Keywords: Plough pan, Subsoiling, Leaf stay-green, N uptake, N concentration
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How to Cite
Cao, Q., G. Li, F. Yang, X. Jiang, L. Diallo, and F. Chen. “PLOUGH PAN IMPACTS MAIZE GRAIN YIELD, CARBON ASSIMILATION, AND NITROGEN UPTAKE IN THE CORN BELT OF NORTHEAST CHINA”. Emirates Journal of Food and Agriculture, Vol. 29, no. 7, Nov. 2017, pp. 502-8, doi:https://doi.org/10.9755/ejfa.2016-12-1975. Accessed 1 Oct. 2022.
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Regular Articles