Compreendendo a dinâmica de atributos de cultivares de arroz de ciclo médio e curto sob efeito do nitrogênio

Ciencia Rural

article

Gil Cunegatto Marques Neto¹  Ledemar Carlos Vahl¹  Rogério Oliveira de Sousa¹  Milena Moreira Peres¹  Marcos Lima Campos do Vale²  Filipe Selau Carlos¹ 

[1]Universidade Federal de Pelotas

[2]Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina

关键词: irrigated rice;    nitrogen fertilization;    growth curve;    absorption;   

DOI  :  10.1590/0103-8478cr20210584

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

Nitrogen (N) is the element supplied by the soil that limits the development of irrigated rice. The hypothesis of the present is that to meet higher demand for N by the plant due to the higher potential yield, it is not necessary to apply a higher dose of N fertilizer. This studyevaluated the efficiency of N utilization, the rate of growth and accumulations of N by plants and the grain yield of two rice cultivars, short cycle and medium cycle, with and without N fertilization. A field experiment was installed in the Rio Grande do Sul, southern Brazil. The treatment factors evaluated were cultivar, with medium and short cycles, with doses of 0 and 150 kg N ha-1. Growth curves, absorption rate, N content and leaf area index over time, root area and grain yield were analyzed. The medium cycle cultivar has a greater potential to explore the environment when compared to the short cycle rice cultivar, both for greater leaf area and root area per cultivation area, as well as for longer exploration times. Thus, the medium cycle cultivar has greater N utilization efficiency and higher grain yield.

【 授权许可】

Unknown