Response of Stylosanthes capitata cv. Lavradeiro to potassium levels

Authors

  • Newton Costa Embrapa Roraima
  • Valdinei Tadeu Paulino Instituto de Zootecnia
  • Vicente Gianluppi Instituto Federal de Rondônia
  • Amaury Burlamaqui Bendahan Embrapa Roraima
  • João Avelar Magalhães Embrapa Meio-Norte

DOI:

https://doi.org/10.22256/pubvet.v12n6a116.1-5

Keywords:

chemical composition, green dry matter, nodulation

Abstract

The effects of potassium levels (0, 40, 80 and 120 kg of K2O ha-1) on green dry matter (GDM), chemical composition and nodulation of Stylosanthes capitata cv. Lavradeiro were evaluated under field conditions in Roraima´s savannas. Potassium fertilization increased significantly (P<.05) GDM yields, nitrogen (N), phosphorus (P), calcium (Ca), magnesium (Mg) and potassium (K) concentrations and number and dry weight of nodules. Maximum GDM yields and P, Ca, Mg and K contents were obtained with the application of 83.3; 105.4; 75.1; 105.2 and 64.7 kg of K2O ha-1, respectively, while the N contents and number of nodules were directly proportional to K levels. The K critic level, related to 90% of GDM maximum production, was estimated at 21.2 g kg-1. The K efficiency utilization was inversely proportional to the K rates applied.

Published

2018-06-06

Issue

Section

Pastagem e forragicultura

How to Cite

Response of Stylosanthes capitata cv. Lavradeiro to potassium levels. (2018). Pubvet, 12(06). https://doi.org/10.22256/pubvet.v12n6a116.1-5

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