ABSTRACT
Effect of calcium and pH in hydroponic culturess, on iron and manganese foliar levels of lentils (Lens culinaris) cv. Araucana-INIA

Claudio Ciudad B.1
 

A syndrome called "Marea Negra", has been reported in several experiments carried out at the La Platina Exp. Sta. (INIA-Santiago). This syndrome is characterized by high foliar levels of Mn and Fe; both could be originated by Ca activity, since it has a rol in the ions' exchange throught the cell membranes. the effects of 0.50 and 100 mg/it of Ca on the Fe, Mn, Mg, Ca, K and phosphate foliar levels were studied, with lentils grown in hydroponic media. Results showed that ph (4.5 to 7) had no influence on lentils growth. However, low Ca levels (0 and 50 mg/it) were detrimental on lentils behavior, and high Fe and Mn contents were detected by foliar analysis. This generated "Marea Negra" symptoms.

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1 Estación Experimental La Platina (INIA), Casilla 439, Correo 3, Santiago, Chile.