Response of wheat varieties to different levels of soil productivity. I. Grain yield and total weight
1943
Worzella, W.W.
Grain yield and total weight (straw and grain) data are reported for five varieties of wheat grown on three levels of soil fertility on each of three soil types during the 5-year period of 1937-41, inclusive. Analyses of variance for grain yield and total weight by individual years and all seasons together indicate that, on each soil type, the differences due to variety and fertility are significant or highly significant. Differential varietal response in grain yield between the different fertility levels was significant in the majority of cases. For total weight, the variety X fertility level interactions were significant only in 6 of the 17 comparisons. The wheats studied tended to fall into distinct response groups. Some varieties yielded relatively higher on the well-fertilized plots, while others were relatively more efficient when grown on the low-fertility plots. While the variety X fertility level interactions for grain yield are significant, the interactions are not great enough to change yield ranks. Therefore, the same adapted variety would be recommended for all productivity levels of a soil.
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