PREDIÇÃO ESPACIAL DAS CARACTERÍSTICAS DE PRODUÇÃO DE Urochloa brizantha cv. MARANDU/SPATIAL PREDICTION OF THE PRODUCTION CHARACTERISTICS OF Urochloa brizantha cv. MARANDU

Environments the pastoris, are heterogeneous, for example, uneven grazed of cattle. The spatial arrangement of biomass characterization of grassland, may be performed by geostatistical. However, for the semivariogram has some reliability the number required of samples sufficient. The objective of this study was investigated the influence of sample density in the construction and accuracy of semivariograms from production characteristics of Urochloa brizantha cv. Marandu. The collected biomass of the plants was held in grid comprising 30, 60, 90, 120 e 150 sample points from an area of 14,400 m^sup 2^ (120 x 120 m). The dry matter yield of green leaves, stem and dead material grassland were submitted to descriptive statistical analysis, to study and geostatistical interpolation by ordinary kriging. The spatial variability of production characteristics of grass was observed in all sampling plans used. The semivariogram best fits were obtained when using 120 and 150 sample points. Thus, it can be used at least 120 points samples to conduct studies of the spatial variability from agronomic characteristics of Urochloa brizantha cv. Marandu.