In view of the relatively poor accuracy of the estimates of cropyield in communities employed in agrometeorological work, a methodof correction is developed using the yield data at agricultural re-search institutes, state farms and seed-breeding fields. It can, in part,diminish the effect of artificial factors on the estimated crop yieldfigures for the communities. Also, an improved method is presentedfor yield decomposition by harmonic analysis and its advantagesare discussed through case studies.