Determine the first$-$year dry sludge application rate for camelina crop on the basis of satisfying crop nitrogen update. Assume that $(1)$ the nitrogen uptake for camelina is about $120$ kg$/$ha$.$y; $(2)$ biosolids contain $2\%$ of organic nitrogen and $0\mathrm{.}2\%$ ammonia nitrogen $($N in NH$4)$; $(3)$ the mineralization rate of organic nitrogen in the first year is $0\mathrm{.}3$; $(4)$ the soil has an initial nitrogen content of zero; and $(5)$ the biosolids application is surface$-$applied dewatered sludge