Spatial variability of tiller mean number and wheat yield

This trial aimed at studying the spatial variability of tiller mean number, as well as wheat crop yieldin 22.62 hectares, in Cascavel, Paraná State, Brazil. Eighty-nine samples points were analyzed, with a 50 m distance between each one. The tiller number registering was done by plant at 30 and 60 days after sow (DAS), as well as wheat crop yield. The data were recorded by geostatistics techniques in order to study spatial variability structure and future estimated values for non sampled places by kriging interpolation. There were differences on tiller number at 30 and 60 DAS due to the great amount of rain in a short term, which caused death on tillers after 30 DAS. The mean tiller number on 30 and 60 DAS showed a little spatial dependence and strong spatial dependence, respectively. The productivity presented moderate spatial dependence, since there was a spatial correlation among the considered variables.

Geostatistics; spatial dependence; kriging