The aim of this work was to evaluate the effect of complementary fertilization with the biofertilizer Supermagro, cow urine and cassava wastewater in the production and levels of nutrients in the leaves of willowleaf mandarim 'Rio' (Citrus deliciosa Tenore) in organic cultivation system. The experimental design used was the randomized blocks, with five replications. All plants were fertilized with cow manure and the applied treatments were complementary to this fertilization. Ten treatments were constituted, by fertilizer types and by modes of application (soil, foliar spray or both) plus a control. The fruits were harvested in 2006 and 2007. The nutrient content in leaves was determined in 2005, 2006 and 2007. The complementary fertilization did not affect the fruit production. However, the cow urine applied on soil, with or without foliar spray, and cassava wastewater, independently of mode of application, increased S contents of leaves. The biofertilizer Supermagro when applied in soil increased B content of leaf, and when it was applied by foliar sprays increased Zn content of leaves.
Citrus deliciosa Tenore; biofertilizer; Supermagro; cow urine; cassava wastewater
