Biological Effects of Biochar on Nitrogen Fertilizer Reduction and Nitrogen Fertilizer Utilization Effciency of Pod Pepper in Yellow Soil of Guizhou

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Supported by the National Natural Science Foundation of China (No. 31860594), the Science and Technology Plan Project of Guizhou Province in China (No. [2016]2581), and the Special Project of Guizhou Academy of Agricultural Sciences in China (No. [2016]025)

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    【Objective】In recent years, biochar has extensively been used as an important fertilization amendment to improve crop quality and fertilizer use efficiency, but little is applied in the yellow soil for pod pepper cultivation in Guizhou. Therefore, this paper was oriented mainly to explore effects of application of biochar on nitrogen content in pod pepper growing in yellow soil of Guizhou.【Method】A field experiment was conducted to study effects of combined application of biochar and N fertilization on yield, quality, nutrient accumulation and nitrogen fertilizer utilization efficiency of pod pepper. The experiment was designed to have four treatments, different in combination ratio, i.e., CF100B0 (Chemical N fertilizer 100% and Biochar 0%), CF90B10 (Chemical N fertilizer 90% and Biochar 10%), CF85B15 (Chemical N fertilizer 85% and Biochar 15%) and CF80B20 (Chemical N fertilizer 80% and Biochar 20%).【Result】Results show that compared with Treatment CF100B0, Treatment CF90B10 increased the yield of pod pepper, by 7.3% in fresh weight and by 2.5% in dry weight while Treatments CF85B15 and CF80B20 decreased the yield slightly. Combined application significantly affected the contents of nitrate and Vc in the fruit of pod pepper. The content of nitrate in the fruit decreased by 4.8%~8.9% in Treatments CF90B10, CF85B15 and CF80B20, while the content of Vc increased by 9.6% only in Treatment CF90B10. But no difference was found between the treatments in content of reducing sugar and free amino acids. In addition, the treatments, especially CF90B10, increases PFPN by 2.08~2.62 kg·kg-1, but lowered AEN and REN in a trend with rising biochar ratio, so Treatment CF90B10 was the highest in AEN and REN, being 7.7 kg·kg-1 and 40.3% respectively.【Conclusion】On the whole, the application of biochar to substitute portion of nitrogen fertilizer can effectively ensure stable yield and N utilization efficiency of pod pepper in Guizhou. The use of biochar to substitute 10% of the chemical nitrogen fertilizer is the best in biological effect and hence recommended as the most suitable formula of fertilization for pod pepper production in the yellow soil of Guizhou.

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ZHANG Meng, WEI Quanquan, XIAO Houjun, ZHAO Huan, GOU Jiulan. Biological Effects of Biochar on Nitrogen Fertilizer Reduction and Nitrogen Fertilizer Utilization Effciency of Pod Pepper in Yellow Soil of Guizhou[J]. Acta Pedologica Sinica,2019,56(5):1201-1209.

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  • Received:August 30,2018
  • Revised:November 02,2018
  • Adopted:November 14,2018
  • Online: April 30,2019
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