宁南旱区沟垄微型集水种植谷子最优沟垄宽度的确定

Optimum width of ridge and furrow for planting foxtail millet in micro-water harvesting systems in arid area of the South Part of Ningxia Province

研究宁南旱区沟垄微型集水种植谷子比较适宜的沟垄宽度,是为了进一步提高降水利用率和产量。以大同14号谷子为材料,设计垄沟比值为1,四种不同宽度的带型。结果表明:在2004～2005年的试验中,微集水处理的蓄水量在谷子不同生育期均比对照增加,水分利用效率平均分别比对照高10.30 kg/(mm.hm2)(2004)、6.76 kg/(mm.hm2)(2005);由于降雨量不同且降雨分布不均匀,使2004～2005年度沟垄微型集雨种植谷子产量有所差异,但在两年试验中,谷子增产趋势基本一致,不同带型的产量分别比对照平均提高108.48%(2004)和135.28%(2005)。通过回归分析,得出在宁南半干旱地区微集水种植谷子比较适宜的沟垄宽度为45 cm。

This paper studied the optimum width of ridge and furrow for foxtail millet in seml-arid area of south Ningxia, which aimed at increasing water availability to crops and yield farther. In the experiment there were four stripshapes （that is 30 cm, 45 cm, 60 cm, and 75 cm）, the ratio of ridge to furrow was 1. Results showed that different widths of ridges and furrows had significant effects on foxtail millet yields, water storage and WUE. The mean WUE of different treatments increased by 10.30 kg/（mm·hm^2） （2004） and 6.76 kg/（ mm·hm^2） （2005）compared with those of CK, respectively, and water storage was obviously increased during foxtail millet growth. Although the yields are different because of precipitation difference in 2004 and 2005, yield increase has the same tendency. On the average the yields of different treatments increased by 108.48 % in 2004 and 135.28 % in 2005 compared with those of CK. By regression analysis, the optimum width of ridge and furrow was about 45 cm.