Saldanha, E.C.M. Silva Júnior, M.L. da Okumura, R.S. Bonfim Neto, A.L. do Viégas, I. de J.M. Fernandes, A.R. <br/><br/>
Spatial variability of soil fertility in areas cultivated with grains in the region of Paragominas, Pará, state, Brazil 

<br/><br/><label>Subjects--Topical Terms: </label><br/>AGRICULTURA DE PRECISĂO<br/>FERTILIDADE DO SOLO<br/>MANEJO DO SOLO