Volume 52 Number 4 Article 49
Year 1998 Month 10
Title: Minimal Nutrient Flux in Leaves of ´Fuji` apple Trees on Two Rootstocks
Authors: D.H. Diamond, E. Fallahi, B. Shafii and R.R. Tripepi
Abstract:
The goal of this study was to monitor the seasonal trends of different nutrients in 'Fuji' apple leaves
on M.9 337 and M.7 EMLA rootstocks for two years, and to determine 'Fuji's' period of minimal flux
using regression analyses.
The effects of rootstock on 'Fuji' seasonal trends and the interactions among
leaf and fruit minerals were examined.
The period of minimum flux for nitrogen in 'Fuji' apple leaves
occurred at 40-140 days after full bloom (DAFB). Nitrogen (% d.wt), K (% d.wt.) and Zn (p.p.m.) concentrations in leaves from trees on both rootstocks decreased during both growing seasons.
Calcium
(% d.wt.) and Mn (p.p.m.) concentrations increased in leaves from trees on both rootstocks throughout
both years.
Magnesium, Fe and Cu trends were inconsistent from year to year.
However, seasonal fluctuations in leaves from trees on both rootstocks were always similar regardless of differences between
years.
Trees on M.7 EMLA had lower leaf N, but higher leaf K and Ca, than those on M.9 337 through
out both growing seasons.
Rootstock effect on K levels was significant during both years.
Calcium con
centrations were not affected by rootstock in 1995, when the crop load was very light, but in the heavy
cropping year 1996, the effect was significant.
The period of minimal flux of N in 'Fuji' leaves from
mid-June until September is little affected by crop or rootstock.
The stable sampling period for foliar
analysis of 'Fuji' apple extends from 40-140 DAFB, providing growers more time to respond to analytical results than the August-only sampling period appropriate for some other cultivars.
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