[Characteristics of urea 15N absorption, allocation, and utilization by sweet-cherry (Prunus avium L.)].
With five-year old 'Zaodaguo' sweet-cherry (Prunus avium L.) as test material, this paper studied the characteristics of its urea 15N absorption, allocation, and utilization when applied before bud-break. The results showed that the Ndff of different organs increased gradually with time, and was higher in fine roots and storage organs at full-blooming stage. At fruit core-hardening stage, the Ndff of long shoots and leaves increased quickly, reaching to 0.72% and 0.59% , respectively. From fruit core-hardening to harvesting stage, the Ndff of fruit had a rapid increase, with the peak (1.78%) at harvesting stage. After harvest, the Ndff of neonatal organs increased slowly while that of storage organs increased quickly. At full-blooming stage, the absorbed 15N in roots was firstly allocated to storage organs, with the highest allocation rate (54.91%) in large roots. At fruit core-hardening stage, the allocation rate in fine roots and storage organs decreased from 85.43% to 55.11%, while that in neonatal branches and leaves increased to 44.89%. At harvesting stage, the allocation rate in different organs had no significant change, but after harvest, the absorbed 15N had a rapid translocation to storage organs, and the allocation rate in fine roots and storage organs reached the highest (72.26%) at flower bud differentiation stage. The 15N allocation rate in neonatal branches and leaves at flower bud differentiation stage was decreased by 19.31%, compared with that at harvesting stage. From full-blooming to flower bud differentiation stage, the utilization rate of urea 15N was increasing, and reached the peak (16.86%) at flower bud differentiation stage.
Zhao
Feng-Xia
FX
State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an 271018, Shandong, China. fxzhao1982@163.com
Jiang
Yuan-Mao
YM
Peng
Fu-Tian
FT
Gao
Xiang-Bin
XB
Liu
Bing-Hua
BH
Wang
Hai-Yun
HY
Zhao
Lin
L
D005308:Fertilizers; D009584:Nitrogen / Q000378:metabolism; D009587:Nitrogen Isotopes / Q000378:metabolism; D027861:Prunus / Q000254:growth & development / Q000378:metabolism*; D012621:Seasons; D012987:Soil / Q000032:analysis; D014508:Urea / Q000378:metabolism*
D005308:Fertilizers; D009587:Nitrogen Isotopes; D012987:Soil; D014508:Urea; D009584:Nitrogen