不同密度和施氮量对鄂大麦507产量相关性状的影响

研究了不同密度和施氮量对裸大麦鄂大麦507产量相关性状的影响.结果表明,在高密度下,鄂大麦507群体最高茎蘖数较高,但成穗率偏低;在低密度下,最高茎蘖数较低,但成穗率较高.施氮量是影响鄂大麦507产量的主要因素,试验最高产量的密肥处理组合为每公顷210万基本苗、施氮水平165kg,单产为5 156.87 kg/hm~2.密肥处理对鄂大麦507不同产量性状的影响效应不一致,有效穗数的主要影响因素为密度和施氮量,穗粒数和千粒重的主要影响因素为密度.高密高肥易导致植株变高,增加倒伏的危险;在低密高肥条件下,穗长增加、每德小穗数增多;在高密低肥条件下,穗长变短、每穗小穗数变少.在产量构成因素中,有效穗数是影响鄂大麦507产量的主要因素.鄂大麦507生产上实现高产的栽培技术方案为前期促分蘖、中期保成穗、后期利于充分灌浆.

Effects of Planting Density and Nitrogen Rate on Yield and Its Related Traits in Nude Barley Variety Edamai 507

This paper studied the response of yield and its related traits to planting density and nitrogen rate in the new nude badev variety Edamai 507.The results showed that Edamai 507 would get higher number of tiller with low panicle rate in high planting density and would get lower number of tiller with high panicle rate in low planting density.Nitrogen rate was the major factor that influenced the yield of Edamai 507.The treatment of 2.1×10~5 plants with 165kg N-fertilizer per hectare could get the highest yield of 5 156.87 kg.Different yield related traits had different response to the cultivation treatments.For effective panicles,the major influence factors were planting density and nitrogen rate while for grains per ear and 1000-grain weight,the major factor was planting density.High density with high nitrogen rate led to higher plant height and increased the risk of lodging.Length of ear and small panicles per ear might increase in low-density with high-fertilizer condition while decrease in high-density with low-fertilizer.Effective tiller was the major factor that mostly influenced the yield of Edamai 507.To achieve high yield,the strategy should be raising the number of tiller,ensuring the panicle rate and grain filling.