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Acta Agron Sin ›› 2016, Vol. 42 ›› Issue (01): 104-112.doi: 10.3724/SP.J.1006.2016.00104

• TILLAGE & CULTIVATION · PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Effects of Different Row Spaces on Canopy Structure and Resistance of Summer Maize

CHANG Jian-Feng,ZHANG Hai-Hong,LI Hong-Ping,DONG Peng-Fei,LI Chao-Hai*   

  1. College of Agronomy, Henan Agricultural University / Collaborative Innovation Center of Henan Grain Crops, Zhengzhou 450002, China
  • Received:2015-03-23 Revised:2015-09-06 Online:2016-01-12 Published:2015-09-14
  • Contact: 李潮海, E-mail: lichaohai2005@163.com, Tel: 0371-63555629 E-mail:zhh198903@163.com
  • Supported by:

    This research was supported by the Modern Agro-industry Technology Research System (CARS-2-19) and Special Fund for Scientific Research in the Public Interest (HY201203100).

Abstract:

In order to explore the effects of row spacing on canopy structure and stress resistance, and identify the appropriate row spacing suitable for the development of agricultural mechanization, field experiments were conducted at Fangcheng and Huixian, using three types of maize hybrids (Xianyu 335 is a high plant, Zhengdan 958 is a middle high plant, and 512-4 is a dwarf) with two plant population densities (60 000 and 75 000 plant ha-1) and five row spaces (50 cm, 60 cm, 70 cm, 80 cm, and 80 cm+40 cm). The results showed that, for treatments with equal rows spacing under the same plant density, with the increasing of row spaces, different hybrids had a leave type and decreased leaf orientation value (LOV), their growth deviated from the plant rows, and trend to perpendicular to row; canopy temperature and humidity decreased, light interception and yield were reduced as well, while resistance to disease and insect was improved. The treatments with 60 cm row spacing can reasonably coordinate the relationship between the canopy microenvironment and yield, resulting in appropriate distribution of canopy leaves, suitable canopy temperature and humidity, maize light interception, especially, with the high light interception rate in the lower part of the canopy, and the significantly increased resistance to stresses, different hybrids with two densities got highest yield frequently in treatments with 60 cm of row spacing regardless of the varieties with different plant heights at planting densities, which so suitable for mechanical farming and field management. Therefore, we suggest that 60 cm is the optimal row spacing for summer corn in Huanghuaihai Region.

Key words: Row spacing, Density, Summer maize, Microclimate, Stress resistance, Yield

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