LIN Song-ming, MENG Wei-wei, NAN Zhen-wu, XU Jie, ZHANG Zheng, LI Lin, GUO Feng, LI Xin-guo, WAN Shu-bo
In 2016-2017, Huayu 25 was used as the material, which were treated by applying calcium and no calcium fertilizer, to study the effects of calcium fertilizer on the plant characteristics, photosynthetic characteris⁃ tics, sugar metabolizing enzyme activity and yield of single-cropping, inter-cropping middle and side row peanut. The results showed that, application of calcium fertilizer reduced the height of main stem and the length of lateral
branches, increased the number of branches and nodes of main stem, increased the chlorophyll content, photosyn⁃ thetic rate, sucrose content and sucrose metabolism related enzyme activity of leaves.The average yield of peanut pod increased 397.2 kg/hm2, a 19.9% yeild growth in mono-cultural and inter-cropping. Under the same calcium application level, the closer to corn rows, the greater the effect of peanut shading. The effect included that the main stem height and lateral branch length were larger, and the activities of sucrose synthase (SS) and sucrose phosphate synthase (SPS) were lower than those of peanut under single cropping condition. Compared with single cropping without calcium application, the calcium application significantly increased the chlorophyll content of inter-crop⁃ping peanuts, but the photosynthetic characteristics, sucrose content, SS and SPS enzyme activities did not decrease significantly, which alleviated the yield reduction of inter-cropping peanuts.The resalts of this experiment indicated that the spatting of 300 kg of calcium fertilizer per hectare could partially alleviate the adverse effects of inter-crop⁃ ping on peanut.