The data below [from Wishart and Sanders (1955, Table 5.6)] represent the weight of green produce in pounds made on an old pasture. There were three main treatments, including a control (O) consisting of the untreated land. In the other cases, the effect of a grass-land rejuvenator (R) was compared with the use of the harrow (H). The blocks were, therefore, composed of three plots each, and the experiment consisted of six randomized blocks placed side by side. The plan and yields were as follows:

Derive an appropriate two-way analysis of variance.

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O. H. R. R. H. O. O. R. H. O. R. H. H. O. R. O. H. R. 813 647 713 814 759 795 705 652 598 774 617 559 580 687 539 581 480 537