密度对不同生态区青贮玉米生物产量和品质指标的影响

Effect of density on biological yield and quality of silage maize in different ecological regions

试验旨在探究密度对不同生态区青贮玉米生物产量和品质指标的影响。研究以中原单32(ZYD32)、宁单40(ND40)、银玉238(YY238)和桂青贮1号(GQZ1H)为材料,于2020—2021年进行了为期两年的密度试验,分析密度6.75万、7.50万、8.25万株/hm^(2)下青贮玉米干物质积累量、产量以及品质的变化。结果显示,不同种植密度下,各品种的含水量和干物质含量差异均不显著(P>0.05)。在泾源县,ZYD32以8.25万株/hm^(2)密度种植的中性洗涤纤维(NDF)含量最高,YY238在密度8.25万株/hm^(2)下酸性洗涤纤维(ADF)含量最高,GQZ1H在密度7.50万株/hm^(2)下粗蛋白(CP)含量最高,ZYD32在密度6.75万株/hm^(2)下淀粉(SH)含量最高。在原州区,ND40在密度7.50万株/hm^(2)下NDF含量最高,GQZ1H在密度7.50万株/hm^(2)下ADF含量最高,YY238在密度8.25万株/hm^(2)下CP含量最高,ND40在密度7.50万株/hm^(2)下SH含量最高。在原州区,ND40、YY238在密度8.25万株/hm^(2)下产量最高;在泾源县,YY238在密度8.25万株/hm^(2)下产量最高。研究表明,银玉238在密度8.25万株/hm^(2)下适宜在海拔1700 m左右的宁夏固原市原州区种植,中原单32在密度7.5万株/hm^(2)下适宜在海拔2000 m高以上的区域种植。

The aim of the experiment was to explore the effect of density on biological yield and quality of silage maize in different ecological regions.The density test was carried out from 2020 to 2021 with ZYD32,ND40,YY238 and GQZ1H as materials.The changes of dry matter accumulation,yield and quality of silage maize were analyzed under the density of 67500,75000 and 82500 plants/hm^(2).The results showed that there was no significant difference in water content and dry matter content among varieties under different densities(P>0.05).In Jingyuan county,ZYD32 had the highest NDF content at 82500 plants/hm^(2),YY238 had the highest ADF content at 82500 plants/hm^(2),GQZ1H had the highest CP content at 75000 plants/hm^(2),and ZYD32 had the highest SH content at 67500 plants/hm^(2).In Yuanzhou district,the content of NDF was the highest at ND40 density of 75000 plants/hm^(2),the content of ADF was the highest at GQZ1H density of 75000 plants/hm^(2),the content of CP was the highest at YY238 density of 82500 plants/hm^(2),and the content of SH was the highest at ND40 density of 75000 plants/hm^(2).In Yuanzhou district,the yield of ND40 and YY238 was the highest at density of 82500 plants/hm^(2).In Jingyuan county,YY238 had the highest yield at a density of 82500 plants/hm^(2).The study indicates that YY238 is suitable for planting at an altitude of about 1700 m with a density of 82,500 plants/hm^(2) in Yuanzhou district of Guyuan city,Ningxia,and ZYD32 is suitable for planting in an altitude of more than 2000 m with a density of 75,000 plants/hm^(2).