Influence of ridges for planting sweet potato on symbiotic ecological factors, photosynthetic abilities and population yield in relay intercropping system

  • Changwen LYU Southwest University, College of Agronomy and Biotechnology, Beibei, Chongqing 400715
  • Daobin TANG Southwest University, College of Agronomy and Biotechnology, Beibei, Chongqing 400715; Key Laboratory of Biology and Genetic Improvement for Tuber and Root Crops in Chongqing, Beibei, Chongqing 400715
  • Kai ZHANG Southwest University, College of Agronomy and Biotechnology, Beibei, Chongqing 400715; Key Laboratory of Biology and Genetic Improvement for Tuber and Root Crops in Chongqing, Beibei, Chongqing 400715
  • Jichun WANG Southwest University, College of Agronomy and Biotechnology, Beibei, Chongqing 400715; Key Laboratory of Biology and Genetic Improvement for Tuber and Root Crops in Chongqing, Beibei, Chongqing 400715
Keywords: environmental factors; land equivalent ratio; relay intercropping; ridging type; sweet potato; symbiotic period

Abstract

Sweet potato (Ipomoea batatas L.) relay intercropping with maize exposes sweet potato to weak levels of sunlight due to the shadow maize creates during the symbiotic period. The insufficient light accordingly causes slow growth and development of vines and leaves of sweet potato in its early stage. The planting density and row direction of maize, the width of the intercropping strip, and the lodging type of sweet potato may form various photo conditions that influence sweet potato. The objective of this experiment was to research the effects of different ridging types on sweet potato and to elucidate the mechanisms of ecological conditions, photosynthetic physiology and intercropping benefits. The results indicated that, contrast to the one wide-ridge with planting two rows of sweet potato and two narrow ridges with planting two rows, mound planting was more superior in many aspects. Through mound planting sweet potato showed a larger range of temperature in air and soil, higher net photosynthetic rate, more active enzymes related with photosynthesis, and more benefits of relay intercropping.

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Published
2020-06-30
How to Cite
LYU, C., TANG, D., ZHANG, K., & WANG, J. (2020). Influence of ridges for planting sweet potato on symbiotic ecological factors, photosynthetic abilities and population yield in relay intercropping system. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 48(2), 849-861. https://doi.org/10.15835/nbha48211837
Section
Research Articles