【摘要】 通过2种类型饲用玉米品种的密度定额试验,结果表明,2类饲用玉米品种的生理特性和生长发育规律不同。明确了青贮青饲型玉米科多8号的适宜栽培密度为6.73万株/hm2左右,合理叶面积指数吐丝期为6.80左右,成熟期保持在4.05以上,全生育期总光合势应维持在417.88万(m2.d)/hm2以上,平均净同化率应在5.72 g/(m2.d)以上,平均作物生长率在226.12 kg/(hm2.d)以上,其生物学产量可达到20 778.4 kg/hm2;粮饲兼用型玉米陕单310的适宜栽培密度为6.90~7.95万株/hm2,合理叶面积指数吐丝期为5.71~6.47,成熟期为3.54~3.94,全生育期总光合势应在358.11万(m2.d)/hm2以上,平均净同化率在5.06 g/(m2.d)以上,平均作物生长率在183.66 kg/(hm2.d)以上,其籽粒产量可达7 248.5 kg/hm2,生物学产量可达到14 798.0 kg/hm2。更多还原

【Abstract】 The physiological characteristics and growth rates of two different types of forage Zea mays were compared at different plant densities.The optimum plant density for Z.mays silage Keduo 8 was about 67 300 plants/hm~2.An appropriate leaf area index(LAI) was 6.80 and 4.05 in the spinning and mature stages respectively,while the total leaf area duration(LAD) was about 4.178 8×10~6(m~2·d)/hm~2.During the whole growth period,average net assimilation rate(NAR) and crop growth rate(CGR) were 5.72 g/(m~2·d) and 226.12 kg/(hm~2·d) respectively and biomass was 20 778.4 kg/hm~2.A suitable planting density for dual-purpose Z.mays Shandan 310 was about 69 000-79 500 plants/hm~2,with a LAI ranging from 5.71-6.47 and(3.54)-3.94 in the spinning stage and mature stages respectively.Total LAD was about 3.581 1×10~6(m~2·d)/hm~2 during the whole growth period.Average NAR and CGR were 5.06 g/(m~2·d)and 183.66 kg/(hm~2·d) and biomass and grain yield were 14 798.0 and 7 248.5 kg/hm~2 respectively.更多还原