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Ciência e Agrotecnologia

versão impressa ISSN 1413-7054versão On-line ISSN 1981-1829

Resumo

RODRIGUES, Victor do Nascimento et al. Comparison between methods for grains yield estimation in corn field. Ciênc. agrotec. [online]. 2005, vol.29, n.1, pp.34-42. ISSN 1413-7054.  https://doi.org/10.1590/S1413-70542005000100004.

The objective of this work was to evaluate the efficiency of two methods used to estimate the productivity of grains on commercial corn farms. The Reetz method, developed at the University of Illinois, in the United States, and the Emater-MG method, used in productivity contests were appraised. The efficiency of the methods was analyzed in three  areas, one being in the UFLA and one in Campo Lindo farm in Lavras-MG, and one in Dutra farm in Itumirim-MG. The productivity estimates and the real productivity being obtained in each local. For obtaining of the estimated productivities, the areas were divided in 4 plots, one portion being harvested per plot. Each portion was made up of 7 sub-samples of 4 m2 with 3 ears of corn each, distributed in 4 lines of 10 m. For the Reetz method, the number of ears of corn in  4m2,  the  number of rows of grain and the number of grains per row were used in the calculation expression. For the Emater method, the spacing among lines, number of ears of corn in 10 m and the average grain weight per ear  of  corn  was  used. With the  estimates of the sub-samples, variance analysis were made for each local and for each method. With the variance components of each analysis, variance functions were determined in accordance with the number  of  portions and sub-samples  for   subsequent determination of intervals of 95% confidence of the estimated average productivity for the methods, with the intention of verifying if these contained the real productivities of the locals. It is concluded that the Emater method  is  useful for comparisons among productivities of different areas. The number of ears of corn sampled per portion that has been recommended by the Emater method can be reduced by half. The Emater method tends  to  overestimate  the  real productivity with the increase of the number of portions  and  sub-samples, given  the  increase  of  the  precision of the estimates. The Reetz method needs to be adapted to hybrid groups with similar characteristics.

Palavras-chave : Zea mays; corn; estimative of productivity; productivity of grains.

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