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Abstract
This paper presents the results of a soybean commercial crop, cv. Jupiter, in a lacustrine and calcareous soil from the lake of Valencia Basin in Venezuela. Soil‐plant relationships are shown between nutrients in interveinal chlorotic plants and soil characteristics. Soil and plant samples were taken at the V4 growth stage. The Ap horizon of the soil had a pH of 7.65 and a CaCO3 equivalent of 26.2%. Available Fe and Cu were 3.08 and 0.15 mg/kg, respectively, classified as very low. Medium amounts of available Zn were found (2.49 mg/kg). Foliar plant analysis of the uppermost mature trifoliate leaves (UMTL) showed values of Fe higher than the average and deficit critical level (DCL) but Cu levels were lower than the DCL. Zn and B were higher than DCL but lower than the average level.
These results showed that Cu deficits, followed by Zn and B, are the main soil factors causing soybean interveinal chlorosis.