Blocking and nearest neighbour analysis in field experiments.

Aman Ullah Bhatti; Muhammad Afzal; Muhammad Azram

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Blocking and nearest neighbour analysis in field experiments.

Author(s)

Aman Ullah Bhatti Soil Science Department, NWFP Agricultural University, Peshawar, Pakistan

Muhammad Afzal Soil Science Department, NWFP Agricultural University, Peshawar, Pakistan

Muhammad Azram Computer Science Department, Peshawar University, Peshawar, Pakistan

Abstract

Various methods are used to compensate for spatial dependence within a field experiment. Traditional block designs are used for this purpose. One of the other possibilities is adjusting each plot yield by the performance of its neighbours using nearest neighbour analysis. Data were taken from three field experiments conducted in Pakistan. The design used in each trial was randomized complete block. Each set of data were analysed using classical analysis of variance, semivariograms and nearest neighboour analysis. Semivariogram analysis showed that yield trends were present in all the trials. Blocking was effective in controlling the environmental variation in two of the trials, while it was ineffective in the third case. It is proposed that the routine analysis of fields experiments based on block analysis be supplemented with other methods when blocking is inefficient at compensating for spatial effects.

Publication Details

Page(s) 9-14

DOI DOI not available

Published Journal: Journal of Science and Technology, Volume: 18, Issue: 1--2, Year: 1994

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