AVALIAÇÃO DE CULTIVARES DE ALFACE ADUBADAS COM SILIFÉRTIL®

Abstract

The trial was carried out at Santana da Vargem, State of Minas Gerais, Brazil, from September to November 2003, with the objective of evaluating the productivity and nutritional state of lettuce cultivars in function of the Si addition. The experimental design was in randomized blocks with four replicates, in factorial arrengement with additional treatments: 3 x 4 +3, composed by three lettuce cultivars: Raider (group crisphead); Regina (group loosensmooth) and Vera (group loosen crisped) and four Silifértil® rates (0, 1, 2 and 4 t ha-1). The additional treatments were composed by the application of 3.5 t.ha-1 of Limestone for the three cultivars. The nutritional status of lettuce was evaluated by Diagnosis and Integrated Recommendation System. The application of Si in the form of Silifértil® do not increase the yield of the lettuce Rider, Regina and Vera. The fertilization with Silifértil® do not increase the silicon concentration in the aerial part of the lettuce, increase the DRIS indice for Si, but do not change the concentrations of most of the nutrients analyzed, except for the concentration of the K and Zn. The concentration of K decreased in function inverse polinomial, with low point in 1,89 t ha-1 of Silifértil®, and without adjusting, a regression curve, the tenor of Zn, decreased with the increase of the rate of Silifértil®. The fertlization with Silifértil® do not promote one better nutritional status for lettuce crops.