Abstract
The ‘Grand Naine’ banana cultivar is grown around the world, but it is susceptible to black Sigatoka fungus. The ‘FHIA 17’ and ‘Nanicao IAC 2001’ cultivars have the potential to replace susceptible cultivars, but there is little information about their nitrogen and potassium nutritional requirements. This study aimed to identify the best fertilizer recommendation with N and K for banana cultivars ‘FHIA 17’, ‘Nanicao IAC 2001’, and ‘Grand Naine’. The applied fertilizer levels with N and K 2 O in two production cycles were as follows: NK0, without fertilization; NK1, 175 N and 285 kg K 2 O ha -1 year -1 ; NK2, 350 N and 570 kg K 2 O ha -1 year -1 ; and NK 3, 525 N and 855 kg K 2 O ha -1 year -1 . It was concluded that the N and K fertilization levels influenced most of the phenological and production parameters of ‘Grand Naine’ and ‘Nanicao IAC 2001’. ‘Nanicao IAC 2001’ and ‘Grand Naine’ achieved maximum yield with an application of 525 kg N ha -1 year -1 and 855 kg K 2 O ha -1 year -1 . The ‘FHIA 17’ cultivar showed a low response to nitrogen and potassium fertilization. Regardless of cultivars, to achieve maximum productivity (44.2 and 43.3 ton ha -1 year -1 ), an application at 150% and 124% of the fertilizer recommendation is required in the 1 st and 2 nd production cycles, respectively.
Highlights
The Ribeira Valley is the main banana-producing region of São Paulo State with an area of 34,500 hectares and production of approximately 952,700 tons (Nomura et al, 2013b)
Soil samples were collected at the depth of 0-20 cm to determine the chemical properties of the samples and for lime and fertilizer recommendations for adequate banana production
Fertilizer doses with N and K were as follows: NK0 = no fertilizer was applied; NK1 = an application of 50% of the standard recommendation of N and K (175 kg ha-1 of N and 285 kg K2O ha-1 year-1); NK2 = an application of 100% of the standard recommendation of N and K (350 kg ha-1 of N and 570 kg K2O ha-1 year-1); and NK3 = an application of 150% of standard recommendation of N and K (525 kg N ha-1 and 855 kg K2O ha-1 year-1)
Summary
The Ribeira Valley is the main banana-producing region of São Paulo State with an area of 34,500 hectares and production of approximately 952,700 tons (Nomura et al, 2013b). The region has favourable climatic conditions for banana growth during most of the year and is characterized by cultivation on small farms (10-20 ha) focusing on the production of banana type Nanica. Banana type Nanica includes the Cavendish and Gros Michel subgroups and forms the basis of the domestic and world market (Soto-Ballestero, 2008). The commercially exploited cultivars in São Paulo are ‘Grand Naine’, ‘Williams’, and ‘Nanicão’, but all of them have at least one undesirable trait for commercial exploitation, such as plant height, productivity, tolerance to pests and diseases, or drought or cold resistance (Nomura, Damatto Jr., Fuzitani, Amorim, & Silva, 2013a)
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