INFLUENCE OF POTASSIUM LEVELS ON ROOT GROWTH AND NUTRIENT UPTAKE OF UPLAND RICE CULTIVARS

Authors

  • Antonio Carlos de Almeida Carmeis Filho Department of Crop Science, College of Agricultural Sciences, Universidade Estadual Paulista “Júlio de Mesquita Filho”, Botucatu, SP.
  • Carlos Alexandre Costa Crusciol Department of Crop Science, College of Agricultural Sciences, Universidade Estadual Paulista “Júlio de Mesquita Filho”, Botucatu, SP.
  • Adriano Stephan Nascente Rice and Beans Research Center, Empresa Brasileira de Pesquisa Agropecuária, Santo Antônio de Goiás, GO.
  • Munir Mauad College of Agricultural Sciences, Universidade Federal da Grande Dourados, Dourados, MS.
  • Rodrigo Arroyo Garcia Western Region Agriculture, Empresa Brasileira de Pesquisa Agropecuária, Dourados, MS.

DOI:

https://doi.org/10.1590/1983-21252017v30n104rc

Keywords:

Oryza sativa L.. Root length. Plant nutrition.

Abstract

Potassium (K) is an essential nutrient for upland rice growth, but little information on the effects of K on root growth and nutrient uptake capacity of upland rice is found. Therefore, an experiment was conducted under greenhouse conditions to evaluate the influence of soil K levels on root growth and nutrient uptake of four upland rice cultivars. A completely randomized experimental design, in a 4x4 factorial scheme (4 levels of K: 20, 40, 80, and 160 mg dm-3; 4 cultivars: Caiapó, BRS-Primavera, IAC-202, and Maravilha) was used, with four replications. Based on regression equations, the highest values of root length density would be found with 136 mg dm-3 of K. The root diameter and dry matter, shoot dry matter and shoot K concentration increased linearly with the increasing K rates. The shoot K concentration of the upland rice cultivars did not differ. The increased level of K in the soil reduced the shoot Ca concentration of intermediate and modern cultivars, and the shoot Mg concentration of all cultivars. The potassium fertilization increased the plant growth, but the magnitude of this effect varied according to the cultivar.

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Author Biography

Antonio Carlos de Almeida Carmeis Filho, Department of Crop Science, College of Agricultural Sciences, Universidade Estadual Paulista “Júlio de Mesquita Filho”, Botucatu, SP.

Doutorando da Universidade Estadual Paulista "Júlio de Mesquita Filho", UNESP, Campûs de Botucatu, no Programa de Agricultura, bolsista FAPESP.

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Published

02-12-2016

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Section

Agronomy