Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Change in soil organic matter (a) and total nitrogen (%) (b) due to different tillage practices (most recent year first). Notes: ZT: zero tillage, MT: minimum tillage, CT: conventional tillage, and DT: deep tillage. Means ± SE are shown in error bar (P ≤ 0.05).
