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| Response of maize yields variability under different fertilizers deficiency scenarios to ecological factors inmountainous region |
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| DOI：10.16768/j.issn.1004-874X.2018.03.002 |
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| Abstract: |
| Based on the records of Soil Test & Formulated Fertilization Project implemented during 2008 to
2009 in Chongqing，combining climatic data during the maize growth period and terrain variables，the response of
maize yields variability under three scenarios including the deficiency of soil nitrogen，phosphorus and potassium
to ecological factors were analyzed using K-means and Classification tree model. The results showed significant
differences were found among three different scenarios. Particularly，the yield with N-deficiency was lower than that
with P and K-deficiency. In addition，the obvious differences among the relative importance of ecological factors
to maize yields were also observed. For N-deficiency scenario，the relative importance of ecological factors were
ranked by soil properties > climate > terrain，soil available nitrogen played the most important role. For P-deficiency
scenario，climate variables followed by soil properties and terrain were the most important factors affecting maize
yield，the sunshine hours was the most important factors. For K-deficiency scenario，climate factors also played
the most important roles，rainfall was of great importance for maize yield variability. Meanwhile，the CART model
explained 65.7%，79.8% and 83.8% of maize yields variability under three different scenarios. |
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