Accumulation of Macronutrients in Cv. 'Astrus' Cabbage as Influenced by Nitrogen Dose and Plant Population

Abstract

) and nitrogen doses (0, 100, 200, and 300 kg ha -1 ) on the accumulation of macronutrients by cabbage plants was studied in Jaboticabal, Brazil, from February 18 to June 2, 2004. The experimental design was a randomized complete block in a 2 × 4 factorial scheme, with three replications. Differences in the amount of macronutrients accumulated by cabbage as function of N dose and plant population, were observed. The largest amounts of macronutrients were detected at the end of the plant cycle when the plant population was the lowest. The amounts of N, P, K, and S were not significantly different when the N dose was increased from 100 to 300 kg ha -1 . The accumulated amounts of Ca and Mg were not significantly different when the N dose was increased from 200 to 300 kg ha -1 . The decreasing sequence of macronutrient extraction (Ca, N, K, Mg, P, and S) was not altered by the treatments. The period from 40 to 60 days after transplantation was responsible for half of the macronutrient accumulation by the cabbage plants.

Response of cabbage to nitrogen fertilization in the northeastern region of Pará State

“…With the nitrogen dose that maximized the HFM (249.5 kg N ha -1 ), the values of PH; NL and CD were 25 cm; 17 cm and 42.08 cm, respectively ( Figures 2B, 2C and 2D). The increase in stem length and NL with increased nitrogen rates is due to the growth-promoting effect of nitrogen (Cardoso & Hiraki, 2001;Ferreira et al, 2002;Cecílio Filho et al, 2016). Ekbladh et al (2007) and Cecílio Filho et al (2013) found a relationship of proportionality between leaf canopy area and nitrogen, showing a direct relationship between leaf canopy area expansion and N uptake.…”

“…At the national level, cabbage has a great economic expression, and is characterized by short cycle time, shallow root system and high demand for nutrients, requiring high fertilizer rates to express its yield potential (Cecílio Filho et al, 2016). Over time, cultivars adapted to high temperatures were obtained, thus expanding the planting and harvest periods (Moreira et al, 2011).…”