青海省中晚熟青贮玉米'铁研53'的引种栽培

在青海4类农业区分别开展青贮玉米品种'铁研53'栽培试验,通过开展播期、种植密度以及肥效试验,分析不同处理对其产量以及品质的影响.结果表明,1)在终霜日前7 d,海北州和海南州以75000～82500株·hm?2的密度种植'铁研53'能达到高产,海西州以90000株·hm?2的密度种植获得高产.东部农业区在终霜日前15 d以105000株·hm?2的密度种植获得高产.2)东部农业区乐都试验点终霜日时播种的'铁研53'蛋白质含量达6.82％,中性洗涤纤维含量为40.3％,酸性洗涤纤维含量为20.1％,淀粉含量为48.7％,品质最佳.3)播种密度为60000株·hm?2时综合营养品质最佳.综合肥效试验和品质分析结果,青海省各地区在种植'铁研53'时应合理施用氮肥,密度应控制在75000～82500株·hm?2时产量及综合营养品质最佳.

Introduction and cultivation of the mid-late silage maize ‘Tieyan53’ in Qinghai Province

A cultivation experiment of the mid-late silage maize ‘Tieyan 53’ was performed in four agricultural areas of Qinghai. The results were as follows. 1) ‘Tieyan 53’ should be planted at a density of 75 000～82 500 plants·ha?2, seven days before the last frost date in Haibei and Hainan, and at a density of 90 000 plants·ha?2, seven days before the last frost date in Haixi. In the eastern agricultural region, high yields could be achieved by planting ‘Tieyan 53’ at a density of 105 000 plants·ha?2, 15 days before the final frost date. 2) The results of quality analysis at the Ledu test site in the eastern agricultural region showed that ‘Tieyan 53’ had a protein content of 6.82%, neutral detergent fiber content of 40.3%, acid detergent fiber content of 20.1%, and starch content of 48.7%, with the best quality, on the last frost day. 3) The best comprehensive nutritional quality was achieved when the planting density of ‘Tieyan 53’ was 60 000 plants·ha?2. Based on the results of fertilizer efficiency test and quality analysis, when ‘Tieyan 53’ was planted in various regions of Qinghai, the yield and comprehensive nutritional quality were the best when nitrogen fertilization was applied reasonably and the planting density was controlled at 75 000 ~ 82 500 plants·ha?2.