Nitrogen nutrition, yield and quality of spinach
1998
Elia, A. | Santamaria, P. | Serio, F.
When grown in solution culture spinach plants confirmed the preference toward NO3- nutrition and showed heavy toxicity to NH4+. IN open field condition the highest yield was achieved with the ammonium sulphate in Bari (autumn-winter cycle -- 110 days) and with calcium nitrate in Policoro (winter-spring cycle -- 64 days). By increasing N level, yield, nitrates and oxalates leaf content increased. Oxalate content was not affected by nitrogen form. Remarkable differences were observed between leaf petiole and blade in nitrate (4062 vs 925 mg kg-1 of fresh mass) and oxalate (1051 vs 6999 mg kg-1 of fresh mass).
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