调整株行距及覆膜对春播高丹草生产性能的影响

为探讨海河平原区覆膜种植对春播高丹草（Sorghum bicolor×Sorghum sudanense）生产性能的影响，本研究在春播雨养条件下，以“等行距+不覆膜”处理为对照，测定了“调整株行距+不覆膜”、“调整株行距+覆膜”处理下高丹草主要农艺性状、土壤温度、土壤含水量的变化。结果表明，“调整株行距+覆膜”处理下的出苗率、单株干重、干草产量以及播后一个月内0~20 cm土壤温度、土壤含水量均显著高于其它2个处理（P<0.05）；与对照“等行距+不覆膜”处理相比，“调整株行距+覆膜”处理可使一个月内0~20 cm土壤温度平均升高2.3℃，土壤含水量平均提高13.8%，出苗率提高32.3%，干草产量提高15.6%。综上所述，高丹草“宽窄行、双株、覆膜”栽培技术可在海河平原区推广应用。

Effects of Adjusting Plant Spacing and Film Mulching on Production Performance of Sorghum bicolor×S.sudanense

To analyze the effect of film mulching treatment on the production performance of Sorghum bicolor×S.sudanense in Haihe plain,the effects of ‘adjusting spacing + no film mulching’ and ‘adjusting plant spacing + film mulching’ on the production performance of Sorghum bicolor×S.sudanense under the rain-fed condition were studied by comparing with the planting method of "equal row spacing with no film mulching". The results showed that there was significantly higher seedling emergence rate,dry weight per plant,hay yield,soil temperature and water content of 0~20 cm within one month after sowing in treatment of ‘adjusting spacing + film covering’ than the other two treatments (P<0.05). Compared with the treatment of "equal row spacing with no film mulching","adjusted plant spacing + film mulching" treatment increased soil temperature of 0~20 cm by 2.3℃ on average,soil moisture content by 13.8% on average,seedling emergence rate by 32.3% and hay yield by 15.6%. In conclusion,it is feasible to popularize the cultivation technique of "Wide and narrow space,double planting,and covering with film mulching" for Sorghum bicolor×S.sudanense in Haihe plain.