Table 1 Characteristics of N fertilizers used in experiments.

From: De-ashed-biochar slow-release N fertilizer increased NUE in alkaline calcareous soils under wheat and maize crops

Fertilizers

N contents (%)

pH

C (%)

CU

46.0

7.22

–

CSRF

26.0

6.90

–

BSRF

20.5

6.91

26

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