草业学报2017，Vol.26Issue(5)：70-80,11.DOI:10.11686/cyxb2016247
光敏型高丹草复种穴播高效栽培模式研究
Efficient double cropping pattern of photoperiod-sensitive sorghum-sudangrass hybrids in summer after winter wheat
摘要
Abstract
We evaluated double-cropping patterns of photoperiod-sensitive sorghum-sudangrass hybrids after a winter wheat crop in the Longdong dryland area,Gansu province.We conducted a field experiment with three dibbling methods (no tillage or mulching,tillage without mulching,tillage with plastic mulching),three varie-ties [Monster,BJM,and Big kahuna (BMR)],and two cutting treatments (once or twice).The phenology, agronomic traits,and grass yield of the varieties were compared among these treatments.In the once-cut treat-ment (before the early frost),plant height,stem diameter,number of internodes,number of leaves,plant fresh weight,leaf weight per plant,stem weight per plant,and number of tillers showed highly significant differences among varieties (P<0.01);plant height and number of internodes showed significant differences a-mong dibbling modes (P<0.05 );and number of leaves,plant fresh weight,leaf weight per plant,stem weight per plant,and number of tillers showed highly significant differences among dibbling modes (P<0.01).The variety×dibbling mode interaction was significant only for leaf weight (P<0.05).For each varie-ty,the fresh grass yield (65% moisture)was higher in the once-cut than in the twice-cut treatment.The aver-age yield across the three varieties was 3 .21 times higher in the once-cut treatment than in the two-cuts treat-ment.There were highly significant differences in grass yield in the first cut,the second cut,and the sum of two cuts among the three varieties in the two-cuts treatment (P<0.01).The grass yield also differed signifi-cantly among the three varieties in the once-cut treatment (P<0.05).The difference in grass yield among dib-bling modes was highly significant in both cutting treatments (P<0.01).The variety×dibbling mode interac-tion was highly significant for grass yield in both cutting treatments (P<0.01).In the once-cut treatment,the average fresh grass yield of all three varieties in the plastic-mulching treatment was 62.21%higher than that in the no tillage without mulching treatment,and 36.45% higher than that in the tillage without mulching treat-ment.The fresh grass yield averaged across the three varieties in the tillage without mulching treatment was 21 .08% higher than in the no tillage without mulching treatment.Under these conditions in the Longdong dryland area,the best combination of cultivation practices for photoperiod-sensitive sorghum-sudangrass hy-brids after a winter wheat crop is tillage with plastic mulching,the BJM variety,with one cutting event.If growers prefer to conduct two or more cuttings,then the Monster variety combined with tillage with plastic mulching is preferable.关键词
光敏型高丹草/夏播复种/农艺性状/生物学特性/草产量Key words
photoperiod-sensitive sorghum-sudangrass hybrids/double cropping pattern in summer/agronomic traits/biological characteristics/grass yield引用本文复制引用
贺春贵,何振富,王斐..光敏型高丹草复种穴播高效栽培模式研究[J].草业学报,2017,26(5):70-80,11.基金项目
甘肃省科技厅科技支撑项目(144NKCA055),甘肃省科技厅科技重大专项(2015GS05915)和甘肃省农业科学院农业科技创新专项(2013GAAS04)资助. （144NKCA055）
