Broccoli yield and its quality in spring growing cycle as dependent on nitrogen fertilization
2005
Wojciechowska, R. | Rozek, S. | Rydz, A.
The results of a 3 year experiment with broccoli Lord F1 grown under field conditions in the spring growing cycle are presented. The aim of the study was to determine the effect of mineral nitrogen fertilization and foliar urea nutrition on the yield and content of some compounds in broccoli heads. Four different levels of mineral nitrogen (Nmin) in the soil were used: natural content (12-25.5 mg N/cubic dm), fertilization with half of the full rate supplemented to the level of 75 mg N/cubic dm, fertilization with the full rate divided into halves (75+75 mg N/cubic dm), and with the single full rate of N supplemented to the level of 150 mg N/cubic dm. In each Nmin treatment additionally two combinations were applied: without and with foliar application of 2 percent urea solution. According to the investigation, generally no significant effect of the mineral nitrogen rate on the biological and marketable yield of broccoli as well as on its quality was observed. The foliar urea application significantly lowered concentration of nitrates in broccoli heads in comparison with the plants not treated with urea. Additionally, irrespective of the year of study the foliar nutrition increased soluble sugar content in all Nmin treatments. Moreover in each year of the experiment the increase of ascorbic acid content in broccoli heads treated with urea was showed
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