Single-head broccoli response to nitrogen application

Abstract

Information regarding nitrogenous fertilization in broccoli for Santa Catarina is still scarce. Therefore, this study aimed at analyzing the nitrogen effect upon the levels of chlorophyll (a, b and total), carotenoids and nitrogen (N) forms in leaves, and upon the yield of inflorescence, stem and leaves of singlehead broccoli. The experiment was conducted in September, 2011, in Florianópolis (SC), with seedlings of single-head broccoli (BRO 68 -Syngenta), in completely randomized blocks, with five treatments (0, 75, 150, 200 and 250 kg ha -1 of N, in the form of urea) and three replications. In the blooming, the fourth leaf from the ground was harvested from each broccoli for the following analyses in triplicate: chlorophyll levels (a, b and total), carotenoids and N forms (NH 4 + , NO 3 -and mineral N). At the end of the cycle, the yield of inflorescence, body (leaves + stem) and total were estimate. The levels of N lead to increased levels of chlorophyll a, b and total, as well as the N forms in leaves and the yield of inflorescence, leaves, and stem of single-head broccoli. The increased N doses promoted increment of carotenoid levels on leaves until 170 kg ha -1 of N, having a decrease for superior doses. The N forms in the plant had been incremented with increasing of N doses supply, reflecting in increased yield of broccoli. The N application in the soil stimulated the synthesis of chlorophylls and carotenoids on leaves, promoting better nutritional quality.Additional keywords: Brassica oleracea L. var. italica Plenck; carotenoids; chlorophyll; nitrogenous fertilization; yield. ResumoAs informações sobre adubação nitrogenada em brócolis para Santa Catarina (SC) ainda são escassas. Por isso, objetivou-se avaliar o efeito do nitrogênio (N) sobre os teores de clorofila (a, b e total), carotenoides e formas de N nas folhas, e sobre a produtividade de inflorescência, talo e folhas de brócolis cabeça única. O experimento foi implantado em setembro de 2011 em Florianópolis (SC), com mudas de brócolis cabeça única (BRO 68 -Syngenta), em delineamento de blocos completos casualizados, com cinco tratamentos (0, 75, 150, 200 e 250 kg ha -1 de N, na forma de ureia) e três repetições.No pleno florescimento das plantas, foi coletada a quarta folha a partir do solo para as seguintes avaliações, em triplicata: teores de clorofila (a, b e total), carotenoides e formas de N (NO 3 -, NH 4 + e N mineral). No final do ciclo, foi estimada a produtividade de inflorescência, corpo (folhas + talo) e total. As doses de N incrementaram os teores de clorofila a, b e total, as formas de N na folha e a produtividade de inflorescência, talo e folhas de brócolis cabeça única. O aumento das doses de N proporcionou o incremento do teor de carotenoides na folha até 170 kg ha -1 de N, decrescendo nas doses superiores. O aumento das doses de N incrementou as formas desse nutriente na planta, refletindo em aumento da produtividade de brócolis. A aplicação de nitrogênio no solo estimulou a síntese de clorofilas e carotenoides nas folha...

Broccoli growth and nutritional status as influenced by doses of nitrogen and boron

“…A similar response was reported by Dufault (1988) in broccolis plants growing in green house and by Arjona and Greig (1984) in broccolis cultivar Green Comet, with a detected increase in chlorophyll content. Ambrosini et al (2015) also reported that for the broccoli cultivar BRO 68, nitrogen application stimulated the synthesis of chlorophyll in the leaves, resulting in improved nutritional quality.…”

“…Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License indicated that nutrients have important effects on broccolis productivity and quality (Belec et al, 2001;Moniruzzaman et al, 2007;Ambrosini et al, 2015).…”

Collard green yield and nutritional quality with mineral and organic fertilization

“…On the other hand, leaf P and Ca concentrations had a quadratic effect in response to N rate, and the maximum concentration of P (12.0 g kg -1 ) and Ca (37.3 g kg -1 ) was obtained with the application of 194 and 268 mg N kg -1 , respectively ( Figures 2B and 2D). The significant increase in macronutrient concentration in the leafy vegetable leaves in response to application rates between 170 and 210 mg kg -1 of N has been commonly reported under protected cultivation conditions (ZANÃO JÚNIOR et al, 2005;KANO et al, 2010;AMBROSINI et al, 2015). Table 3.…”