Substrato e adubação nitrogenada na produção de mudas de maracujazeiro

Abstract

This work aimed to study nitrogen dose on substrates and seedling development of businesses in protected conditions high passion fruit genotypes. The work was conducted under glass in the municipality of Presidente Prudente-SP from May to September 2010. Were used 12 treatments, being 3 commercial substrates (Bioplant®, coconut Fiber and Vivatto®) and 4 doses: 0; 150; 300; 600 mg dm-³ N in the form of urea. Have been assessed data on: (A) plant height (cm); number of sheets expanded (NFL); dry matter weight of leaves (MSPA), roots (MSR) and total (MST) (g); and chlorophyll content. To 60 days the best medium in MST were recorded in commercial coconut fiber substrate (3.75 g) and Vivatto® (3.46 g). The best results were obtained by MSPA in coconut Fiber and Vivatto®. For doses of N quadratic effect was for the variables of MSPA, MSR and MST in 300 mg dose from N dm-3. To 120 days the coconut fiber substrate presented the best medium to high and dry mass of aboveground and total. Regarding the MSR in the substrate Bioplant® there was better response to nitrogen application with 468 mg dm-3 dose with only 4.0 g MSR. To 120 days, the commercial coconut fiber substrate provided the best development of seedlings of fruit genotypes. And the best results in response to nitrogen fertilization on growth of seedlings to plant height parameters and total dry matter was obtained in the dose of 600 mg dm-³ N to 120 days in protected conditions.