SPATIAL VARIABILITY OF SOME CHEMICAL ATTRIBUTES IN AREAS WITH SOY AND RICE CULTIVATED IN THE STATE OF RORAIMA - CONTRIBUTIONS OF PRECISION FARMING

Authors

  • Shirlene Souza Oliveira Universidade Federal Rural da Amazônia
  • Deymeson Mateus Soares da Silva Universidade Federal Rural da Amazônia
  • Rian Antonio dos Reis Ribeiro Universidade Federal Rural da Amazônia
  • Jairo dos Santos Reis Universidade Federal Rural da Amazônia
  • Jorge Luís Padilha Costa Universidade Federal Rural da Amazônia
  • Eduardo Cézar Medeiros Saldanha Universidade Federal Rural da Amazônia

DOI:

https://doi.org/10.18542/ragros.v5i2.1802

Abstract

The state of Roraima has an area of ??225 116 km2, representing 2.64% of the national territory and 5.81% in the northern region. detailed knowledge of the spatial variability of soil fertility attributes can improve the localized applications of lime and fertilizers. The objective of this study was to evaluate the variability of some attributes (ph, ca +2 and p) chemical soil under cultivation of soybean and rice in the state of Roraima, with the help of precision agriculture. Soil sampling was conducted in 3265 ha, with sampling grid of 5 ha, totaling 653 sampling points (composite samples). Each composite sample was georeferenced and formed from 10 single samples collected in a circle around each sampling grid, thus resulting in a total of 6530 samples collected simple. For soils assessed with precision agriculture of the two municipalities, the attributes showed satisfactory levels of variation (available p) disabled (ca available), and very low (pH).   Keywords: georeferencing, grains, soil fertility.  

Published

2014-07-20

Issue

Section

Notas Científicas/Técnicas