ISHS Acta Horticulturae 53: IV Africa Symposium on Horticultural Crops
APPLICATION OF SOIL AND PLANT ANALYSIS TO NUTRITION OF TOMATOES IN SOUTH WEST NIGERIA |
| Authors: | R.A. Sobulo, A.A. Agboola, A.A. Fayemi |
| Abstract:
Nutrient requirements of tomatoes in South Western Nigeria were determined by soil, leaf and total plant analysis. Organic carbon, total N and nitrate-nitrogen were used as indexes of available N. Critical levels by these methods were 9 ppm of NO3-N, 2% carbon, and 0.1% total N. Organic carbon was recommended for routine analysis because it is more easily determined than the other two methods. Phosphorus sorption capacity of soils determined at standard concentration of 2 ppm of P was more suitable than Bray 1 for assessing available P. Critical sorption value was about 6 ppm of P. Critical potassium level was 12 mgK/100g of exchangeable K. Leaf analysis of 12 cultivars indicated no significant differences in the N, P, K and Mg contents but significant (P<001) differences in the Ca content. Sufficiency ranges of N, P, K and Mg were 0.21–0.43% No3-N, 0.32–047% P, 3.02–4.32% K and 0.51–0.84% Mg, respectively. Total plant analysis of 'Ife No 1'cultivar was a rough guide to the fertilizer needs of the crop. | |
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