Food-supply of forced, cutted roses under glass or plastic
2002
Komiszar, L.
Roses cultivated in green-houses as cut flowers demand a lot of nutrients, nevertheless, they need less salt - 0,10-0,15% in solution.Optimum quantity rate of nutrients in their soil: N-NO3 150, P2O5 150-200, K2O 500-700 mg/l. According to the results of a reparted soul-examination the basic fertilization can be completed by 12-15 kg/m2 organic fertilizer deficient in chlorine, or also by 100-180 g/m2 superphosphate chemical fertilizer. It has to be done in the period of forcing-growing by 60-80 g/m2 predominant nitrogen, and in the period of flowering phosphor and calium in a dose of 60 g/m2. Addition to the quantities above, 40-60 g/m2 fertilizer is needed fortnightly in autumn and spring, and in every three weeks in winter, but in summer it might be 40 g/m2 weekly.
显示更多 [+] 显示较少 [-]