Effects of Density and Potassium Fertilizer on Photosynthetic Physiological Characteristics and Yield of Peanut under Intercropping with Apricot Trees

Huang Xiaoshuang; Huxidan Maimaiti; Rexidan Amuti; Aihemaiti Rouzi; Li Haifeng; Liu Zhigang

doi:10.14083/j.issn.1001-4942.2025.03.009

Abstract：In order to clarify the appropriate planting density and reasonable potassium application level for peanut intercropping with apricot trees in Turpan,Xinjiang,the experiment was conducted using random-ized block test with the locally cultivated variety Luhua 9 as test material.Three planting densities were set as 238.3 thousand(D1),170.8 thousand(D2)and 136.2 thousand(D3)holes per hectare,and five potassium fertilizer levels were set as 0(K1),45(K2),105(K3),150(K4),and 225(K5)kg·hm-2.The effects of different planting densities and potassium fertilizer levels on peanut photosynthesis,physiological character-istics and yield were studied under intercropping with apricot trees.The results showed that at the potassium application level of K4 and planting density of D2,the net photosynthetic rate(Pn),transpiration rate(Tr,except for the seedling stage)and stomatal conductance(Gs)of peanut functional leaves were the highest at all growth stages,and except Pn and Tr at seedling stage,significant differences were observed among differ-ent potassium fertilizer levels;the intercellular CO2 concentration(Ci)was the lowest and significantly lower than that of other potassium fertilizer levels except K5.Under different planting densities,the activities of su-peroxide dismutase(SOD),peroxidase(POD)and catalase(CAT)in peanut functional leaves showed the trend of first increasing and then decreasing with the increase of potassium fertilizer level at various growth sta-ges,and reached the peak under K4 treatment showing significant differences compared to most of other potas-sium fertilizer levels.The content of malondialdehyde(MDA)in leaves showed a trend of first decreasing and then increasing with the increase of potassium fertilizer level,and reached the lowest under K4 treatment show-ing significant differences compared to most of other potassium fertilizer levels.Under different planting densi-ties,the yield of peanut pods was the highest in K4 treatment,which was significantly higher than that of other potassium fertilizer treatments(except K5 under D3).From the above,it could be concluded that under the conditions of this experiment,the planting density and potassium level were optimal at 170.8 thousand holes per hectare and 150 kg·hm-2,respectively,which could be recommended as the planting management modes for peanut intercropped with apricot trees.