Tomato growth, nitrogen fraction and mineral composition in response to nitrate and ammonium foliar sprays
1983
REP.TM-0504
Details
Title
Tomato growth, nitrogen fraction and mineral composition in response to nitrate and ammonium foliar sprays
Author
Magalhaes, J.R.
Wilcox, G.E.
Wilcox, G.E.
Publication Date
1983
Call Number
REP.TM-0504
Summary
In a first experiment, tomato seedlings were grown in sand culture under full sunlight or 67% shade and received foliar sprays containing 8,40 or 200 mM N as Ca(NO3)2 or (NH4)2SO4. In a second experiment, seedlings were grown in sand culture under full sunlight or 50% shade and received N as nitrate or ammonium at 8mM N in the nutrient solution to the root system or at 24mM N in a foliar spray soultion. Shade increased ammonium toxicity in plants sprayed with NH4 but decreased NH4 toxicity in plants receiving NH4 through the roots. NH4-N reduced growth and cation uptake less when supplied through the roots than foliar sprays. Shoot amino acid content was highest in plants receiving N as NH4, regardless of how the N was applied. Plants sprayed with NH4 incorporated a greater amount of N into insoluble compounds compared with plants sprayed with NO3. N uptake/unit leaf area was greater in plants growing under full sunlight than in plants growing under shade. Plants supplied with N through the roots had higher levels of free amino acids and total N. [HA54-2534]
Journal Citation
v.6(11):911-939, JOURNAL OF PLANT NUTRITION
Contact Information
harvest@worldveg.org
Record Appears in
Research > Published Articles