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Application of soil and plant analysis to nutrition of tomatoes in south west Nigeria

, : Application of soil and plant analysis to nutrition of tomatoes in south west Nigeria. Acta Horticulturae (53): 235-247

Plant nutrient requirements were determined by soil, leaf and plant analysis. Organic C, total N and nitrate-N were used as indexes of available N. Critical levels by these methods were 9 p.p.m. of NO3-N, 2% C and 0.1% total N. The P sorption capacity of soils determined at a standard concentration of 2 p.p.m. of P was more suitable than the Bray 1 method for assessing available P. Critical sorption value was about 6 p.p.m. of P. Critical K level was 12 mg K/100 g of exchangeable K.

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