Characteristics of Photosynthesis and Yield in Potato Intercropping with Maize

Characteristics of photosynthesis and yield of potato intercropping with maize were studied in this research.Inter-planting reduced the chlorophyll content of potato and photosynthetic rate,resulting in dropping in the productivity of single plant.Intercropping changed the ventilation and light transmission of corn canopy and led to photosynthesis increase in the mid-lower leaf on the corn,contributing to the increase in productivity of single maize plant.Differences existed in response of potatoes to intercropping.Some varieties,such as Yunshu 301,were more tolerant than others and only slightly dropping in yield was observed when intercropped with maize.Other varieties,such as Hezuo 88,were more sensitive to intercropping.The SPAD value of leaf blade and the decrease in photosynthetic rate could be used as index for selection of potato variety with more tolerance to intercropping with maize.