Effect of nitrogen on yield and active constituents of calendula officinalis l

Abstract EN

The field experiment was carried out during two successive seasons (2001-2002) at Maryout Res.

Station to study the effect of ammonium sulfate (as a source of N fertilization) with two levels (40 and 60 Kg N / fed.) and its method of application i.

e.

all amount added at once or divided into two or three equal portions after 30, 60 and 90 days from transplanting on yield, volatile oil, carotenoids and minerals content of Calendula officinal’s L.

flowers.

Yield characters i.e.

number of Flowers / plant as well as flowers fresh and dry weights were affected with nitrogen levels and its application.

The maximum yield of flowers was obtained as a result of 60 kg N / fed especially when this amount was divided into two portions.

Concerning the effect of an application on carotenoids content and volatile oil percentage, it can be noticed that these constituents reached its maximum values also as a result of using 60 kg N / fed divided into two portions.

Minerals status was affected by N fertilization.

Rising N level increased N percentage in flowers.

On the other hand, increasing N fertilization decreased P and K percentage in Calendula officials L.

flowers.