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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (5): 883-.doi: 10.19802/j.issn.1007-9084.2020173

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Effect of different potassium levels on the photosynthetic characteristics and yield of peanut

  

  1. 1.College of Agronomy, Shenyang Agricultural University, Shenyang 110866,China; 2. College of Agronomy, Hunan Agricultural University, Changsha 410128, China
  • Online:2021-11-01 Published:2021-11-01

Abstract: This study was aimed to demonstrate effects of different level of potassium (K) on the photosynthetic characteristics and yield of peanut under the same level of nitrogen (N) and phosphorus (P) , in which Nonghua 9 was used as the test materials and field randomized block trial was conducted. There were four different levels of K: 0 kg·hm-2 (CK), 112.5 kg·hm-2 (T1), 225.0 kg·hm-2 (T2) and 337.5 kg·hm-2 (T3). Two-year results showed that increased K had improved leaf area index (LAI), as well as, improved net photosynthetic rate (Pn), stomatal conductance (Gs), and transpiration rate (Tr) at pegging stage and pod-setting stage observably, while the intercellular CO2 concentration (Ci) was decreased. Also, the extra K had increased the maximum photosynthetic rate (Pmax), light saturation point (Isat), but had reduced the light compensation point (Lcp) and dark respiration rate (Rd) of the peanut. Rich K was beneficial to increase Pods per plant, Pod weight per plant, 100-pod weight, 100-kernel weight and yield of peanut finally. Between two years yield trials, T2 treatment was increased by 7.37% and 12.54% than CK and therefore outstanding from other treatments. Therefore, the best recommended amount of potassium application was 225.0 kg·hm-2 K2SO4 for peanut field production in this area.

Key words: peanut, level of potassium, photosynthetic characteristic, yield

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