| Autor: |
Liu, Jianliang, Zhan, Ai, Bu, Lingduo, Zhu, Lin, Luo, Shasha, Chen, Xinping, Cui, Zhenling, Li, Shiqing, Lee Hill, Robert, Zhao, Ying |
| Zdroj: |
Agronomy Journal; March 2014, 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 maysL.). 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−1in 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 film‐mulched maize. |
| Databáze: |
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