Effect of intercropping potatoes with oats on the photosynthetic characteristics and yield of potato

doi:10.11686/cyxb2014349

Abstract

Abstract: Intercropping systems with four different potato-oat row ratios (2∶2, P₂O₂; 2∶4, P₂O₄;4∶2, P₄O₂;4∶4,P₄O₄) were tested to determine effects on the photosynthetic characteristics and yield of potato. During the flowering period, potato leaf area index (LAI) and leaf weight ratio (SLW) decreased significantly. After the first crops of oats are harvested, potatoes receive more light and growth space; thus SLW recovered to a degree. When the crops were mature, the LAI of potato in intercropping systems was higher than that in monoculture. Compared with other intercropping ratios, the LAI and total chlorophyll content under P₄O₄ treatment were significantly higher during the entire growth period. During the flowering period, net photosynthetic rate (P_n), stomatal conductance (G_s) and transpiration rate (T_r) of potato in intercropping systems significantly reduced compared to those in monoculture, while intercellular CO₂ concentration (C_i) significantly increased. However, the photosynthesis indexes decreased at maturation point. Compared to monoculture, intercropped potato returned significant increases in production, possibly due to increased tuber yield and marketable yield per plant, as well as reduced numbers of small potato. The highest yield was obtained under P₄O₄ treatment. Intercropping with oats also returned land equivalent ratios (LER) greater than 1. LER was highest (1.22) under the P₄O₂ treatment, followed by the P₄O₄ treatment. The results suggest that potato/oat row ratios of 4∶2 or 4∶4 perform better than other ratios in this intercropping system.

WU Na, LIU Xiao-Xia, LIU Ji-Li, LU Wen. Effect of intercropping potatoes with oats on the photosynthetic characteristics and yield of potato[J]. Acta Prataculturae Sinica, 2015, 24(8): 65-72.

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