New Progress in the Study of the Effect of Long-term Fertilization on Soil Nitrogen Cycling in Tea Garden
Published:25 Nov.2022    Source:CTSS

Applying nitrogen fertilizer is an important measure to improve tea yield and quality in production, but excessive nitrogen application not only causes waste of fertilizer, but also aggravates soil acidification.

In order to understand how the nitrogen cycle of tea garden soil responds to the mechanism of long-term fertilization, the tea tree nutrition and nutrient management innovation team, based on the long-term field positioning experiment, studied the response characteristics of nitrification denitrification in tea garden soil and its associated microbial communities to different long-term nitrogen application levels through chemical inhibition, combined with fluorescence quantitative PCR and soil macro genome technologies, and analyzed its impact mechanism from a microscopic perspective. The results showed that the strongly acidic tea garden soil could maintain a strong nitrification intensity, increasing the amount of nitrogen fertilizer could significantly enhance the soil nitrification potential.
This study revealed that the enhancement of substrate supply for nitrification and denitrification under long-term nitrogen application, and the induction and positive regulation of the expression of related microbial communities and related functional genes are important mechanisms for maintaining the rapid nitrogen turnover capacity of tea garden soil under acidification conditions.