Nitrogen Recovery and Transport Efficiency of Winter Rapeseed and Residual Nitrogen Effect on Subsequent Sesame using 15N Labelling Technique

Abstract

In China, the application rate of nitrogen in rapeseed is high, but the uptake and utilization efficiency is low, which may cause irreversible environmental pollution. Use of efficient nitrogen rate and to improve nitrogen recovery, transport and residues management is important for crop productivity and sustaining the environment. Therefore, a pot was conducted using two winter rapeseed cultivars of Huayouza No.9 (HZ9) and Huashuang No. NRE of sesame from basal and topdressing was 1.91% and 1.34%, with a yield increase of 16.22% and 59.50% over the control, respectively. The integrated data indicated that higher N recovery and transport efficiency can be achieved by adequacy reducing application rate and increasing the proportion of topdressing, and the residual soil nitrogen of rapeseed can be recovered to some extent by planting sesame.