The size and yields of grape vines can be increased through the application of synthetic chemical fertilizers, which provide nutrients necessary for the health of the vines. However, during the recent drought, vineyard owners observed that the vines not treated with such fertilizer handled the hot, dry conditions better than did those treated with fertilizer.
Which of the following, if true, would best explain the surprising result?
A. Some vineyard owners used fertilizer in concentrations much lower than those recommended by the manufacturer of the fertilizer.
B. The over-application of fertilizer can weaken plants, making them susceptible to disease and to insect attacks.
C. In the absence of fertilizer, vines grow deeper roots in order to find nutrients in the soil.
D. Water is as important as any nutrient for the health of grape vines.
E. Vineyard owners who use organic methods do not use synthetic chemical fertilizers to treat the soil in which vines grow.
Source:
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