Chinese Journal of Agrometeorology ›› 2020, Vol. 41 ›› Issue (01): 16-23.doi: 10.3969/j.issn.1000-6362.2020.01.002

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Effects of Ridge Height on Root Zone Temperature and Yield of Soil-Ridged Substrate- Embedded Cultivation Sweet Pepper in Chinese Solar Greenhouse

LI Bao-shi, LIU Wen-ke, LI Zong-geng, ZHANG Yu-bin, ZHA Ling-yan, ZHOU Cheng-bo, SHAO Ming-jie   

  1. Institute of Environment and Sustainable Development in Agricultural, Chinese Academy of Agricultural Sciences/Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures, Ministry of Agriculture, Beijing 100081, China
  • Online:2020-01-20 Published:2020-01-20

Abstract: In order to optimize the ridge height of soil-ridged substrate-embedded cultivation (SSC), sweet pepper was cultivated by SSC in solar greenhouse. Four different cultivation treatments including soil ridge (SR), normal ridge (NR), short normal ridge (NRs), and soil embedded (SE) were designed, thus to study the effects of ridge height on temperature and thermal characteristic of root zone, buffer capacity of ridge soil, and yield of sweet pepper. The results showed that the higher the ridge height, the higher the temperature during the daytime. The daytime average temperature of NR was 1.07 ℃ higher than that of the SR treatment which had same ridge height. During the nighttime low temperature period, the NRs root zone temperature was the highest, which was 1.77 ℃ higher than SR treatment. The average root zone temperature of each treatment was 17.03-18.55℃ during 5 days from Dec. 27-31, 2018. The ridge height had significant effects on the plant height and stem diameter of sweet pepper. The higher the ridge height, the greater biomass of sweet pepper plants, the fresh and dry weight of shoot and root of NR was greatest. While the yield of sweet pepper was highest under NRs. Compared with SR, NR and NRs increased sweet peppers yield by 43.0% and 50.9%, respectively. In a word, under the same water and fertilizer conditions, the ridge height increased the root zone temperature in the range of 1.52 ℃. NRs treatment could increase nighttime root zone temperature. Although relative higher ridge (NR) was conducive to increase the biomass of sweet pepper, the yield could be promoted by reducing ridge height appropriately. Therefore, the SSC with a ridge height of 10 cm could improve production performance of SSC by elevating root zone temperature in night, which is more suitable for sweet pepper production in solar greenhouse.

Key words: Chinese solar greenhouse, Ridge height, Root zone temperature, Soil-ridged substrate-embedded cultivation