3Brown A F,Yousef G G,Jeffery E H.Glucosinolate profiles in broccoli:Variation in levels and implications in breeding for cancer chemo protection[J].Journal of American Horticultural Science,2002,127:807-813.
4Dufault R J,Luther W J.Interation of nitrogen fertility and plant populations on transplanted Broccoli and cauliflower yields[J].Hortscience,1985,20(1):127-128.
5Cutliffe J A.Effect of plant population,nitrogen and harvest date on yield and maturity of single-harvest broccoli[J].HortScience,1971,6(5):482-484.