| Autor: |
Jianliang Liu, Ai Zhan, Lingduo Bu, Lin Zhu, Shasha Luo, Xinping Chen, Zhenling Cui, Shiqing Li, Lee Hill, Robert, Ying Zhao |
| Zdroj: |
Agronomy Journal; Mar/Apr2014, Vol. 106 Issue 2, p390-396, 7p |
| Abstrakt: |
Film mulching is a very common technique in agriculture worldwide, but few studies have focused on the dry matter (DM) and N accumulation of mulched crops. Understanding the grain yield (GY) associated with DM and N accumulation is essential for improving crop production. We conducted a 3-yr field experiment with six N fertilizer rates (0, 100, 200, 250, 300, and 400 kg ha-1) in the semiarid climate of northwest China to determine the GY and DM and N accumulation of film-mulched maize (Zea mays L.). The results showed that relatively high GYs (13.1-15.1 Mg ha-1) were obtained using N fertilizer rates of 200 to 400 kg ha-1 in the 3 yr despite large year-to-year differences in rainfall. When the N rate was below 250 kg ha-1, the GY, DM, and N accumulation increased significantly as the N fertilizer rate increased. A linear-plateau model best described the relationship between the GY and the DM and N accumulation during the pre-silking stage and a linear model the relationship during the post-silking stage. We conclude that optimizing N management to improve DM and N accumulation (especially post-silking) is the key to ensuring a high yield of ilm-mulched maize. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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