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.