Wang Qian Deng, Chen Bo Lang, Yusufujiang Yusuyin, Wang Cheng, Chai Zhong Ping
College of Pratacultural and Environmental Science, Xinjiang Agricultural University, Urumqi 830052.
Xinjiang Key Laboratory of Soil and Plant Ecological Process, Urumqi 830052, China.
Ying Yong Sheng Tai Xue Bao. 2018 May;29(5):1443-1449. doi: 10.13287/j.1001-9332.201805.009.
Six-year-old Korla fragrant pear trees were fertilized with N-labelled urea before early bud stage to examine the absorption, distribution, and utilization of urea. Results showed that there was a significant difference of N distribution rate in organs at different growth stages. N was pre-ferentially distributed in the roots , with Ndff (N 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, N absorbed in roots preferentially moved to new organs (leaves and new shoots), with N distribution rate to roots being continuously decreased. Fruits became the new distribution center with highest Ndff at harvest stage. The amounts of absorbed N in fruits accounted for 19.8% of total absorbed N in the tree. The utilization rate of N-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.
对6年生库尔勒香梨树在萌芽前期施入N标记尿素，以研究尿素的吸收、分配及利用情况。结果表明，不同生长时期各器官中氮素分配比例差异显著。氮素优先分配到根系，萌芽期根系的Ndff（肥料氮占器官全氮的百分率）最高，其次是新梢。在新梢生长和果实膨大期，根系吸收的氮素优先向新的器官（叶片和新梢）转移，根系氮分配比例持续下降。果实成为新的分配中心，采收期Ndff最高。果实吸氮量占全树吸氮总量的19.8%。当季N标记尿素利用率随生育期逐渐增加，采收期利用率最高，为18.5%。
