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.
Determination on the duration and onset of developmental stages during the growth cycle. (A) New measurements in changes of nitrate influx rate as a function of developmental stages from Beuve et al. (2004). (B) Fitting of the quantity in total N exported plotted against thermal time with logistic curves for the three levels of fertilization. (C) Relative N accumulation derived from the logistic curves. Vertical bars indicate SD for n = 3 when larger than the symbol.
