The relationship between shoot length and utilization of reserve nutrition after heading cuts in young apple trees
2011
Arakawa, O. | Xu, J. | Asada, T.
The relationship between the shoot length and the utilization of reserve nitrogen and carbon was investigated in one-year-old apple trees (Malus × domestica) by girdling or bending the trunk. Apple trees (‘Fuji’ on rootstocks of Malus prunifolia Borkh. var. ringo Asami) were treated with 15N and 13C in the year prior to the experiment. Two-thirds of the trunk of each tree was removed the following April (heading cut), and trunks were girdled or bent or left untreated at this time. Following treatment there no relationship between shoot length and the 15N excess% of the shoots at each measured stage during the growing season; girdling and trunk bending were shown to have no effect on this relationship. Shoot length was positively correlated with 15N or 13C distribution in the shoots in all treatments. It is suggested that as they grew, the longer shoots absorbed higher amounts of reserve nitrogen and carbon than the shorter shoots. The degree to which stored versus current absorbed nutrition contributes to new shoot growth might be the same in all shoots, and was not affected by girdling and bending the trunk.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library