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Long-term N fertilization reduces uptake of N from fertilizer and increases the uptake of N from soil.

Abstract：

:Long-term supply of synthetic nitrogen (N) has the potential to affect the soil N processes. This study aimed to (i) establish N response curves to find the best balance between inputs and outputs of N over four ratoons; (ii) use 15N-labeled fertilizer to estimate the N recovery efficiency of fertilizer applied in the current season as affected by the N management in the previous three years. Nitrogen rates (control, 60, 120, and 180 kg ha-1 N) were applied annually in the same plots after the 1st, 2nd, 3rd, and 4th sugarcane cycles. Sugarcane yield, N uptake, and N balance were evaluated. In the final season, 100 kg ha-1 of 15N was also applied in the microplots to evaluate the effect of previous N fertilization on N derived from fertilizer (NDF) and N derived from soil (NDS). Sugarcane yields increased linearly with the N rates over the four sugarcane-cycles. The best balance between the input of N through fertilizer and N removal by stalks was 90 kg ha-1 N in both the 1st and 2nd ratoons, and 71 kg ha-1 N in both the 3rd and 4th ratoons. Long-term application of N reduced NDF from 41 to 30 kg ha-1 and increased NDS from 160 to 180 kg ha-1 N. A key finding is that long-term N fertilization has the potential to affect soil N processes by increasing the contribution of soil N and reducing the contribution of N from fertilizer.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Joris HAW,Vitti AC,Ferraz-Almeida R,Otto R,Cantarella H

doi

10.1038/s41598-020-75971-0

subject

Has Abstract

pub_date

2020-11-02 00:00:00

pages

18834

issue

1

issn

2045-2322

pii

10.1038/s41598-020-75971-0

journal_volume

10

pub_type

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