Abstract
The rational use of nutrients is of fundamental importance for obtaining high productivity of high nutritional quality. This work was developed with the aim of evaluating the quality of pepper fruit grown under different fertigation managements and different levels of nitrogen and potassium. The experimental design was of randomised blocks in a 3 x 6 factorial scheme with four replications. The treatments resulted from the combination of three fertigation managements (M1-based on the rate of absorption; M2-monitoring the conductivity of the soil solution; M3-monitoring concentrations of N and K ions in the soil solution) with six levels of N and K (N0K0, N50K50, N100K100, N150K150, N200K200 and N300K300) as a percentage of the recommended dosage for the crop under conventional fertigation (M1) or hydroponics (M2 and M3). Fruit quality was evaluated for the following characteristics: pH, soluble solids, titratable acidity, vitamin C content and the ratio of soluble solids to titratable acidity. The different fertigation managements only affected the levels of soluble solids (SS) and titratable acidity (TA), reducing the SS and TA. The variables under study were adjusted for the levels of N and K using quadratic models. Normal 0 21 false false false PT-BR X-NONE X-NONE MicrosoftInternetExplorer4
Highlights
The pepper is among the ten most cultivated vegetable crops in Brazil, and is grown in all Brazilian states
According to Fontes, Dias and Graça (2005), it is necessary to define how much to apply with each fertigation, in order to meet the needs of the plant, since a reduction in production of the pepper in response to increased rates of nitrogen fertiliser has been linked to the effects caused by an increase in electrical conductivity of the nutrient solution
The effect of a significant interaction can be seen between the systems of fertigation management (M) and levels of N and K (L), only for the variables, soluble solids (SS) and vitamin C content
Summary
The pepper is among the ten most cultivated vegetable crops in Brazil, and is grown in all Brazilian states. Among the environmental factors that influence productivity and quality in the crop, irrigation and fertilisation deserve more attention as they display greater levels of crop response. Proper management of these factors is of fundamental importance in obtaining products of high quality. According to Fontes, Dias and Graça (2005), it is necessary to define how much to apply with each fertigation, in order to meet the needs of the plant, since a reduction in production of the pepper in response to increased rates of nitrogen fertiliser has been linked to the effects caused by an increase in electrical conductivity of the nutrient solution
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