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Agronomic performance of root chicory, Jerusalem artichoke, and sugarbeet in stress and nonstress environments

Agronomic performance of root chicory, Jerusalem artichoke, and sugarbeet in stress and nonstress environments

Crop science 39(6): 1815-1823

Introduction of the fructan crops root chicory (Cichorium intybus L.; RC) and Jerusalem artichoke (Helianthus tuberosus L.; JA) into agricultural production systems is desirable to diversify crop rotation. Field experiments were conducted to compare the agronomic performance of RC and JA with sugar beet (Beta vulgaris L.; SB). One set of cultivars during 1995, 1996, and 1997 and an additional set in 1997 were grown on a sandy loam soil (Haplic Luvisol) at Braunschweig, Germany. Crops were cultivated with and without supplemental irrigation, complete and no weed control (1995 and 1996), and N fertilization rates of 0, 60, and 120 kg ha(-1). Severe water stress caused significant but similar storage organ yield losses in all crops, whereas mild water stress mainly affected JA yields. Averaged across years and N levels, storage organ yield losses through weed competition under irrigation amounted to 70, 47, and 8% in SB, RC, and JA, respectively. Averaged across years, in the absence of water and weed stress, SB, RC, and JA at their respective optimal N levels gave root and tuber dry matter yields of 14.8, 15.0, and 11.5 Mg ha(-1), and sugar yields of 11.5, 11.2, and 8.1 Mg ha(-1), respectively. Maximal SB and JA yields generally were achieved at the highest N rate, while RC peak yields were attained at 60 kg N ha(-1). With the same amount of N taken up, RC in 1995 and SB in 1996 and 1997 produced the highest sugar yields.

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