Rs. Chung et al., Effect of split applications of nitrogen fertilizer on the growth and nitrogen composition of Chinese mustard, COMM SOIL S, 30(3-4), 1999, pp. 307-316
We assessed the effect of split applications of nitrogen (N) fertilizer on
the growth and N composition of Chinese mustard. There were six treatments
in which various rates of N fertilizer were applied as a basal dressing and
two top dressings. The plants were harvested 40 days after seeding and the
N composition of the plants determined. The soil was also sampled and the
pH, electrical conductivity (EC) of 1:1 soil:water ratio extract, organic m
atter, nitrate-nitrogen (NO3-N), Bray P1-extractable phosphorus (P) as well
as 1N neutral ammonium acetate-extractable potassium (K), calcium (Ca), an
d magnesium (Mg) concentrations after harvesting of the plants determined.
The results show that there was no significant difference in yield from the
various treatments. Total N concentration in shoots receiving the 1-2-1 fe
rtilizer treatment was higher than that of the other treatments. However, N
O3-N, soluble reduced N, and insoluble N concentrations in shoots as well a
s NO3-N, soluble reduced N, insoluble N, and total N concentrations of root
s were not significantly different due to the treatments.