Abstract:
<p align="justify"> Samples of six types of soil were tested in a greenhouse. Three doses of boric acid: 0.0 g (control); 0.10 g and 0.20 g were applied to the prepared soils. Seeds of cabbage were sown and only two plants remained after cutting. Mehlich 1, HCl 0.05 mol.L^-1, and the saturation extract were used to determine the boron in the soil. After determining the dry matter and calcined the plants ashes were dissolved in HCl 0.6 mol.L^-1. The boron concentration was determined by the Azomethine-H method The correlation between boron .concentration in the plant (&#956;g.g-1 ) and total boron in the plant (&#956;g.plant^-1 ) versus boron concentration in the soil showed that among the three extractors the HCl O.05 mol.L-1 and saturation extract presented the best correlation coefficients (r): 0.857 and 0.832, 0.858 and 0.841 respectively. The Mehlich I extractor presented the lowest correlation coefficients for all conditions studied </p>