Soil pH as Measured in Different Solutions and the Nutrient Content with of Water Some Coffee Soils

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Aduayi, E.A.
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Soil-pH measurement in various dilutions with water and with O.OIM CaCl2, and the determination of total and available soil-Cu and some nutrient elements were carried out in sites that had undergone various treatments and cultural practices for over ten years at the Coffee Research Station. PH measured in 1: 1, and 1:2.5 dilutions with O.OIM CaCl2 solution was more consistent when compared to pH measured in water. Napier grass (Pel1nisetum pur pureum) cultivation produced low soil-K (1.48 me per cent), and high soil - Mg and - Ca (2.02 and 8.98 me per cent respectively) compared to high soil-K (2.36 me per cent), low Mg (1.94 me per cent) and Ca (8.14 me per cent) in sites in which coffee had been cultivated and mulched with Napier grass. Available Cu was about 10 per cent of the total Cu, and increased in sites with copper spray treatments. Available P was low in all sites sampled. There was a better correlation established in soil pH measured in O.OIM CaCl2 solution and the values were more consistent than pH measured in water.
Turrialba, 22 (3), pp. 305-310