Articles
NITROGEN NUTRITION OF YOUNG TOMATO SEEDLINGS. EFFECTS OF VARIOUS NITROGEN CONCENTRATIONS ON GROWTH AND DEVELOPMENT
Article number
277_18
Pages
167 – 178
Language
French
Abstract
Initial growth of tomato seedlings was studied in various conditions of nitrogen availability.
Earlymech (UC82) was seeded in pots filled with sand in greenhouses.
Pots were daily watered with 4 nutrient solutions as treatments i.e. a complete balanced one (N), a nitrogen poor one (N/3), a nitrogen rich one (3N) and a complete one except nitrogen (ON). A soil test (ONsoil) was added.
Plant growth and development were quantified from emergence till the beginning of fruit set.
Until emergence tomato did not need external N, supply from seed being enough.
At the first 2 true leaves appearance an effect of nitrogen was observed.
N/3 rate significantly decreased plant shoot weight and increased root weight during a short time.
On and after the 3rd leaf appearance growth rate and N requirements increased.
At the beginning of flowering, treatments 3N, N and ONsoil gave far better results than N deficient treatments. 3N rate supply surpassing plant requirements dramatically reduced root growth and increased shoot growth with numerous small trusses which mostly aborted.
ONsoil treatment gave a shoot growth and development very similar to 3N rate until early flower set.
Then it behaved more like N/3, and N supply would have been necessary in order to satisfy’ plant requirements.
Earlymech (UC82) was seeded in pots filled with sand in greenhouses.
Pots were daily watered with 4 nutrient solutions as treatments i.e. a complete balanced one (N), a nitrogen poor one (N/3), a nitrogen rich one (3N) and a complete one except nitrogen (ON). A soil test (ONsoil) was added.
Plant growth and development were quantified from emergence till the beginning of fruit set.
Until emergence tomato did not need external N, supply from seed being enough.
At the first 2 true leaves appearance an effect of nitrogen was observed.
N/3 rate significantly decreased plant shoot weight and increased root weight during a short time.
On and after the 3rd leaf appearance growth rate and N requirements increased.
At the beginning of flowering, treatments 3N, N and ONsoil gave far better results than N deficient treatments. 3N rate supply surpassing plant requirements dramatically reduced root growth and increased shoot growth with numerous small trusses which mostly aborted.
ONsoil treatment gave a shoot growth and development very similar to 3N rate until early flower set.
Then it behaved more like N/3, and N supply would have been necessary in order to satisfy’ plant requirements.
Authors
J. SUNIAGA QUIJADA
Keywords
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