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以郑单958为材料,研究播期和移栽对夏玉米生育期、形态指标及产量的影响。结果表明,与6月5日播种相比,6月13日、6月21日、6月29日播种分别减产8.7%、15.7%、31.5%。6月5日以后播种每推迟1天,生育期缩短0.25~0.32天,灌浆期缩短0.12~0.25天,产量每公顷降低100千克。河北北部地区夏玉米播种应在6月13日之前,最迟6月21日之前完成。6月20日2
Taking Zhengdan 958 as material, the effects of sowing date and transplanting on the growth period, morphological index and yield of summer maize were studied. The results showed that compared with the sowing on June 5, the sowing on June 13, June 21 and June 29 respectively decreased by 8.7%, 15.7% and 31.5% respectively. After the June 5 planting every postponed 1 day, the growth period shortened 0.25 ~ 0.32 days, the grain filling period shortened 0.12 ~ 0.25 days, the yield reduces 100 kilograms per hectare. Summer maize planting in northern Hebei should be completed by June 13 and by June 21 at the latest. June 20 2