The effect of nitrogen form and air temperature during foliar fertilization on gas exchange, the yield and nutritive value of spinach ( Spinacia oleracea L.)
Year: 2008
Type: article
Abstract: A pot experiment conducted in a growth chamber studied the effectiveness of foliar fertilization of spinach (Spinacia oleracea L.), with different forms of nitrogen applied with the air temperatures: 5°C, 15°C and 25°C. Nitrogen was supplied three times in the form of 1% water solutions of CO(NH 2 ) 2 , NH 4 NO 3 , NH 4 HCO 3 and Ca(NO 3 ) 2 × 4 H 2 O, with water as the control. The obtained results showed that nitrogen in the form of Ca(NO 3 ) 2 × 4 H 2 O - independent of the air temperature during solution application - is the least useful in foliar fertilization of spinach leaves, whereas the effectiveness of the other forms was similar, although the best effects were given by NH 4 NO 3 . Application of all forms of nitrogen at the air temperature of 25°C had the most positive effect on the course of gas exchange (stomatal conductivity, photosynthesis, transpiration). Despite that, the highest leaf yield with the highest content of nitrogen, total chlorophyll (a + b), carotenoids and vitamin C, and the lowest content of nitrates, was given by plants with foliar application of all nitrogen forms at the temperature of 15°C.
Source: Folia Horticulturae
Authors: Edward Borowski, Sławomir Michałek
Institution: University of Life Sciences in Lublin
Language: English
Subfield: Soil Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: gold
Estimated APC paid: $701
OpenAlex ID: W1991996149