【摘要】 以尿素和磷酸二氢钾不同浓度,组合"盖阔"或"速效"除草剂,对拔节末期老芒麦混施,结果表明,混施降低了杂草种类、单位面积杂草生物量,杂草占生物量比例;混施对老芒麦株高、鲜草产量、干草产量变异系数分别为12.42%(P=0.0006),29.98%(P<0.0001),25.93%(P<0.0001),"尿素7500g/hm2+磷酸二氢钾300g/hm2+盖阔27g/hm2"、"尿素7500g/hm2+盖阔27g/hm2"和"尿素15000g/hm2+磷酸二氢钾300g/hm2+速效75g/hm2"3个组合增产效果明显;混施对种子产量影响极显著(P=0.0009),"尿素7500g/hm2+磷酸二氢钾300g/hm2+盖阔27g/hm2"、"尿素7500g/hm2+速效75g/hm2"和"尿素15000g/hm2+磷酸二氢钾300g/hm2+速效75g/hm2"3个组合种子增产显著;处理组分与生产性能指标的相关系数较低,肥料与除草剂共同作用导致了生产性能的差异性;混施可减少田间作业次数、降低管理成本、达到增肥和除草的双重效果,值得在生产中推广与应用。更多还原

【Abstract】 Six types of treatment with different contents of(NH2)2CO,KH2PO4 and broad-leaved herbicide 75% tribenuron dry suspension concentrate(SC)and 28% wettable powder sulphinpyrazone(WP T-Y)were applied to Elymus sibiricus cv.chuancao NO.2 grassland at the jointing stage.The mixed treatment affected weed species,weed biomass per unit area,and weed rate to total biomass.Three treatments,7 500g/ha (NH2)2CO+300g/ha KH2PO4+27g/ha 75% tribenuron dry SC,7 500g/ha(NH2)2CO+27g/ha 75% tribenuron dry SC,and 15 000g/ha(NH2)2CO+300g/ha KH2PO4+75g/ha 28% WP T-Y significantly improved the vegetative growth,and resulted in coefficients of variation of 12.42% (P=0.000 6),29.98% (P< 0.000 1),25.93% (P<0.000 1)for height,fresh forage yield and hay yield,respectively.The other three treatments,7500g/ha (NH2)2CO+300g/ha KH2PO4+27g/ha 75% tribenuron dry SC,7 500g/ha (NH2)2CO+75g/ha 28% WP T-Y,and 15 000g/ha(NH2)2CO+300g/ha KH2PO4+75g/ha 28% WP T-Y,significantly(P=0.000 9)increased seed yield of E.sibiricus.However,the correlation coefficients of these mixed treatments with production performance were low,which may be due to the interaction of fertilizer and herbicides.Overall,the mixed application of fertilizer and herbicides is worth applying widely,because of the reduced number of field operations and management costs,and the dual effect of fertilization and weed control achieved.更多还原