ISHS Acta Horticulturae 53: IV Africa Symposium on Horticultural Crops
THE EFFECTS OF NITROGEN, PHOSPHORUS AND POTASSIUM ON THE CANNING QUALITY OF TOMATOES (LYCOPERSICON ESCULENTUM) IN SOUTH-WESTERN NIGERIA |
| Authors: | R.A. Sobulo, A.O. Olorunda |
| Abstract:
The effects of nitrogen, phosphorus and potassium fertilizers on total solid, titratable acidity, reducing sugars and ascorbic acid of tomatoes were investigated. Total solids content of tomato was increased when P level in the soil was low to optimum. Above this it decreased. N and K at any level had no effect on total solids. N, P and K sometimes increased titratable acidity, reducing sugars and ascorbic acid contents, but decreased them when their rates were higher than the optimum level required by the tomato crop. A small-fruited cultivar, Marzanino, had lower titratable acidity and reducing sugars than large-fruited Ronita and ""Ife No.1"" cultivars. The significance of these fertilizer treatments and some cultural practices in improving canning qualities of tomatoes is discussed. | |
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