REACTION OF TWO BARLEY CULTIVARS TO A PERIOD OF SOIL WATER STRESS DURING HEADING

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Abstract
Two cultivars of barley (Hordeum vulgare L.) grown at three levels of soil fertility in lysimeters protected from natural precipitation by an automatic rain shelter were subjected to two levels of soil water stress at heading time. At all levels of fertility, reductions in yield of Compana resulting from stress were proportionately smaller than those of Betzes, but the difference between cultivars was greatest when no fertilizer was applied. This differential response resulted primarily from a substantial decrease in kernel size of Betzes but a slight increase in that of Compana due to soil water stress. The number of tillers and number of kernels per spike of each cultivar were affected about equally.

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