Macro‐nutrient Status of Brassica napus and Brassica juncea Grown Under Swedish Conditions

Abstract

Concentrations and amounts of macro-nutrients (N, P, K, Ca, Mg, S) in shoots, vegetative and generative plant parts in B. napus and 5, juncea and nutrient inflow per unit root length in B. napus were studied in a field experiment at Uppsala, Sweden. Concentrations in vegetative plant parts were, except for Ca in B. napus, highest at the beginning of the season, and N and K were higher in B. napus than in B. juncea. The higher N concentration in vegetative parts (leaves, stems and pods) in B. napus was probably due to differences in growth pattern between the species. Seed concentrations of N, P, Ca, Mg and, most pronounced of all, S were higher in B. juncea. Nutrient amounts were, with the exception of K, throughout the season higher in B. juncea than in B. napus due to a higher dry matter production. Nutrient inflow per unit root length in B. napus was highest during the rosette stage for all nutrients. During flowering, the inflow decreased for N and K and increased for P and Ca. After root growth had stopped, no net inflow of K and S was found and inflow rates of other nutrients were at very low levels.

Performance of Rapeseed Mustard Varieties Grown Under Different Plant Density

“…These findings are in agreement with those of McGregor (1987), Ali et al (1996) and Cheema et al (2001). This was due to the reason that, with increase in density the number of siliquae, which were produced solely by each plant, will decrease due to low space and more competition (Kjellstrom, 1995). Variety and plant density interaction showed that the most siliqua plant -1 (145.70) was noticed in BARI Sarisha-13 with 10 plants m -2 (V 1 P 1 ) ( Table 2).…”

Carbohydrates accumulation, oil quality and yield of rapeseed genotypes at different nitrogen rates

“…A high nitrogen application rate enhanced nitrogen availability for plants under suitable growing conditions (Hocking et al, 1997;Kjellstrom, 1997;Merrien et al, 1988). It was reported by Hocking and Stapper (2001) that the accumulation of N in rapeseed shoots was higher between the rosette and flowering stages, thus, contributing to the more available nitrogen absorption during the flowering stage.…”

“…The accumulation of nitrogen in all organs (stem and leaves) was declined except seeds. Thus, it approved the dilution effect, which states that a higher rate of biomass accumulation decreased the rate of N accumulation (Hocking et al, 1997;Kjellstrom, 1997;Merrien et al, 1988).…”