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CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2021, Vol. 43 ›› Issue (5): 843-.doi: 10.19802/j.issn.1007-9084.2020121

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Effects of potassium application rates on succession of main photosynthetic organs in oilseed rape

  

  1. 1. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China; 2. Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River) Ministry of Agriculture and Rural Affairs, Wuhan 430070, China
  • Online:2021-11-01 Published:2021-11-01

Abstract: For high yield and better understanding of potassium (K) effect, succession and photosynthetic capacity of rapeseed photosynthetic organs (leaves and siliques) were investigated by field experiment in 2018-2019. The dynamic changes of leaf area index (LAI) and pod wall area index (PAI) were explored under different K application rates. Results showed that the LAI gradually increased with growth, and reached to the maximum (3.4-4.8) at flowering stage and then rapidly decreased, whilst the PAI was increased steeply. Under the same treatments, the maximum PAI was equivalent to that of the LAI. The effects of K application rates on LAI and PAI were consistent. Both LAI and PAI were increased with K application rates. But PAI/LAI was not affected by K application. During the growth stages, photosynthetic rates were increased with K rates until exceeding to 120 kg/hm2. At the daytime, photosynthetic rates in the noon were enhanced obviously with K application rates. K fertilizer alleviated the ‘midday depression’ during the overwintering period. LAI, PAI and photosynthetic rates were significantly related to seed yield. Application of K fertilizer significantly increased the photosynthetic area and capacity of photosynthetic organs of oilseed rape, thereby increasing seed yield.

Key words: oilseed rape, potassium, photosynthetic organs, pod wall, photosynthesis

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