Abstract
Greenhouse crops afford higher quality and competitiveness. The objective of this work was to evaluate the effect of nitrogen doses (80, 110, 140 and 170 kg ha-1) applied through fertigation in the yield of two cultivars of Cucurbita pepo (Anita F1 and Novita Plus), in a 4 × 2 factorial design. The experiment was carried out in an entirely randomized design with eight replications. The study evaluated the sum of the fresh biomass of fruits per plant, number of fruits per plant and mean fruit biomass. Analysis of the collected data made it possible to assume that increasing doses of N led to a linear yield increase for cultivar Anita F1 and a quadratic increase for cultivar Novita Plus. Key words: Cucurbita pepo, nitrogen, drip fertigation, vegetables.
Highlights
IntroductionThe market demands constancy and production volume, which vegetable farmers cannot meet due to lack of investment in technology for production systems
Vegetable production is an intensely competitive activity
For cultivar Anita F1, the data fit the linear regression, which suggests that the dose corresponding to maximum yield is greater than 170 kg N ha-1
Summary
The market demands constancy and production volume, which vegetable farmers cannot meet due to lack of investment in technology for production systems. In this context, greenhouse crops emerge as an alternative for the seasonality of production and increased productivity, as crops are not exposed to environmental variability and disease control is more efficient. Excessive doses of nitrogen promote vegetative growth in detriment of reproductive growth (Marschner, 1995). Nitrogen fertilization of squash promotes plant growth from the seedling stage (Higuti et al, 2010), which may lead in the future to larger leaf area and greater supply of photoassimilates for fruits. It is essential to avoid excess or deficient nitrogen fertilization
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