Studies on the productivity of vegetable crops under a plastic greenhouse. VII. Relation between NO3-N in soil and plants and the electrical conductivity of the soil solution
Kageyama, M.; Aoki, M., 1971: Studies on the productivity of vegetable crops under a plastic greenhouse. VII. Relation between NO3-N in soil and plants and the electrical conductivity of the soil solution. Bulletin of the Horticultural Research Station, B Okitsu (11): 85-100
Three-year studies are reported on the effects of N at 0.25-1.25 g/kg dry soil, either as ammonium sulphate or urea, on the growth of potted tomatoes and cucumbers for 5 weeks. Both crops received P and K at 0.25 and 0.30 g/kg soil, respectively. With tomatoes receiving ammonium sulphate differences in response to N application rate were slight, though higher N levels caused some deformity of the young leaves.Other references