Characteristics of absorption, utilization, and distribution of 15N-urea for Korla fragrant pear in spring.

doi:10.13287/j.1001-9332.201805.009

Abstract

Abstract: Six-year-old Korla fragrant pear trees were fertilized with ¹⁵N-labelled urea before early bud stage to examine the absorption, distribution, and utilization of urea. Results showed that there was a significant difference of ¹⁵N distribution rate in organs at different growth stages. ¹⁵N was pre-ferentially distributed in the roots , with Ndff (¹⁵N amount absorbed from the fertilizer contribution rate of the total nitrogen organ) being the highest in roots following by new shoots at full-bloom stage. During new shoot growing and fruit expanding stages, ¹⁵N absorbed in roots preferentially moved to new organs (leaves and new shoots), with ¹⁵N distribution rate to roots being continuously decreased. Fruits became the new distribution center with highest Ndff at harvest stage. The amounts of absorbed ¹⁵N in fruits accounted for 19.8% of total absorbed ¹⁵N in the tree. The utilization rate of ¹⁵N-labelled urea at current season increased gradually with the growth stages. The maximum value of utilization rate was 18.5%, which was observed at harvest stage.

Key words: ¹⁵N-urea, isotope tracer, absorption, Korla fragrant pear, utilization

WANG Qian-deng, CHEN Bo-lang, YUSUFUJIANG Yusuyin, WANG Cheng, CHAI Zhong-ping. Characteristics of absorption, utilization, and distribution of ¹⁵N-urea for Korla fragrant pear in spring.[J]. Chinese Journal of Applied Ecology, 2018, 29(5): 1443-1449.

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Characteristics of absorption, utilization, and distribution of ¹⁵N-urea for Korla fragrant pear in spring.

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