Nitrogen Application Timing and Levels Affect the Fate and Budget of Fertilizer Nitrogen in the Apple-Soil System

Overview

Journal Plants (Basel)

Date 2024 Apr 9

PMID 38592783

Authors

Fen Wang

Chaoran Wang

Binghao Yang

Xinyu Luo

Gaowei Qi

Fajin Ji

Xinkai Guo

Tao Yang

Xuehui Zhao

Ming Li

Qianqian Jiang

Ling Peng

Hui Cao

Affiliations

Soon will be listed here.

Abstract

This study aimed to determine the effects of the nitrogen (N) application period and level on the fate of fertilizer N and the contribution of N absorption and translocation to apple organ N. Two N application periods (labeled by the N tracer technique in spring and summer, represented by SP and SU, respectively) and three N levels (N0, MN, and HN) were used to determine the physiological indexes and aboveground, root, and soil N content of 4-year-old dwarf ('Red Fuji'/M9T337) and arborized ('Red Fuji'/ Rehd.) apple trees. The results showed that HN led to shoot overgrowth, which was not conducive to the growth of the apple root system (root length, root tips, root surface area, and root volume) or the improvement of root activity. The contribution of soil N to apple organ N accounted for more than 50%, and the contribution of N application in summer to fruit N was higher than that in spring. Under HN treatment, the proportion of soil N absorbed by trees decreased, while that of fertilizer N increased; however, the highest proportion was still less than 50%, so apple trees were highly dependent on soil N. Under MN treatment, fertilizer N residue was similar to soil N consumption, and soil N fertility maintained a basic balance. Under HN treatment, fertilizer N residue was significantly higher than soil N consumption, indicating that excessive N application increased fertilizer N residue in the soil. Overall, the N utilization rate of arborized trees (17.33-22.38%) was higher than that of dwarf trees (12.89-16.91%). A total of 12.89-22.38% of fertilizer N was absorbed by trees, 30.37-35.41% of fertilizer N remained in the soil, and 44.65-54.46% of fertilizer N was lost. The N utilization rate and N residual rate of summer N application were higher than those of spring N application, and the N loss rate was lower than that of spring N application. High microbial biomass N (MBN) may be one of the reasons for the high N utilization rate and the low loss rate of N application in summer.

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