Castor bean cake in top-dressing application as a source of nitrogen on the production and quality of zucchini organic seeds

Authors

  • Natália de Brito Lima Lanna Universidade Estadual Paulista Júlio de Mesquita Filho
  • Estefânia Martins Bardiviesso Universidade Estadual Paulista Júlio de Mesquita Filho
  • Ana Emília Barbosa Tavares Faculdades Integradas Aparício Carvalho
  • Priscilla Nátaly de Lima Silva Universidade Estadual Paulista Júlio de Mesquita Filho
  • Pâmela Gomes Nakada-Freitas Universidade Estadual Paulista Júlio de Mesquita Filho
  • Sayuri Beatriz Hara Noda Universidade Estadual Paulista Júlio de Mesquita Filho
  • Antonio Ismael Inácio Cardoso Universidade Estadual Paulista Júlio de Mesquita Filho

DOI:

https://doi.org/10.14393/BJ-v36n0a2020-53563

Keywords:

Cucurbita pepo, Germination, Nitrogen fertilization, Organic fertilization, Vigor.

Abstract

Studies in vegetables show that fertilization influences seed production positively, however, when the quality of the seeds is analyzed, the results are mostly inconsistent. The objective of this study was to evaluate the effect of castor bean cake (CBC) dose splitting in top-dressing application on the production and quality of zucchini organic seeds, as well as its effect on the macronutrient content of fruits and seeds. The experimental design was a randomized block design and four replications. There were 13 treatments with four doses of CBC in top-dressing (1.7, 3.4, 5.1 and 6.8 t ha-1) per three applications (33.3-33.3-33.3%, 50-50% and 33-50-17%) and the control treatment without any kind of top-dressing fertilization. The study evaluated the number of ripe fruits per plant, the production (number and mass) of seeds per fruit and per plant, the mass of one hundred seeds, seed germination, first germination count, and macronutrient content in the diagnosis leaf, in mature fruits (without seeds) and seeds. The number of ripe fruits per plant was not affected by the CBC doses in top-dressing, neither by the splitting of the applications. It was observed that the number of seeds per fruit, mass of seeds per fruit and mass of seeds per plant showed quadratic behavior. Regarding seed quality, only the 1.7; 3.4 and 5.1 t ha-1 doses produced seed with superior quality than the other doses. In conclusion, the CBC doses increased the number of seeds per fruit, mass of seeds per fruit and per plant up to the 4.5t ha-1 dose, approximately.

 

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Published

2020-12-30

How to Cite

LANNA, N. de B.L., BARDIVIESSO, E.M., TAVARES, A.E.B.., SILVA, P.N. de L.., NAKADA-FREITAS, P.G., NODA, S.B.H. and CARDOSO, A.I.I.., 2020. Castor bean cake in top-dressing application as a source of nitrogen on the production and quality of zucchini organic seeds. Bioscience Journal [online], vol. 36, pp. 130–142. [Accessed16 June 2024]. DOI 10.14393/BJ-v36n0a2020-53563. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/53563.

Issue

Section

Agronomy