| In order to determine the best of maize planting density and nitrogen fertilization in the central arid area of Gansu, the use of a field experiment was carried out. The new trial materials were Fudi 201 and Gaoyu 811 that are the local maize varieties widely cultivated. The effects of different densities and nitrogen rate on its yield components and traits were then conducted, and maize production performance and comprehensive traits was analyzed to determine the best combination, allowing the improvement of maize yield potential and thereby providing a theoretical support for the whole film double furrow in the arid farming area in central Gansu. The results showed that with the whole film double furrow sowing planting techniques, the analysis of the effects of density and nitrogen application on maize yield components indicated that the optimal planting density for high and stable yield was 7.2×104 plant·hm-2 with a nitrogen rate of 675 kg·hm-2, resulting in 13 792.35 kg·hm-2 of the dry matter yield in ear. Additionally, production was enhanced significantly by increasing the nitrogen application, causing stem diameter to be elevated first but then decreased after the addition of nitrogen fertilizer. Increasing in planting density did not reduce the yield markedly, but the stem diameter. This further reduced the lodging resistance, and weakened the yield stability. Low-density nitrogen fertilization increased yield apparently. Moreover, the correlation coefficient between various traits by different treatments of planting density and nitrogen levels was 0.7977, reaching a significant level by 0.001 reliability test. |