| Effects of water and fertilizer on yield of spring maize and temporal and spatial distribution of soil nitrate-nitrogen |
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| DOI：10.7606/j.issn.1000-7601.2017.01.17 |
| Key Words: spring maize integration of water and fertilizer yield soil profile soil nitrate nitrogen |
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| Abstract: |
| Field and plot experiment were carried out to investigate effects of different water and fertilizer practices on yield of spring maize and temporal and spatial distribution of soil nitrate nitrogen (N03--N). The results showed that yield was 17 107 kg·hm-2 for integration of water and fertilizer management, being significantly higher than 13 349 kg·hm-2 in traditional water and fertilization management area. From seedling stage to harvest stage of spring maize, N03--N content in 0～90 cm soil layers showed the trends of continuously decreasing in zero fertilizer area, N03--N accumulation decreased from 452.5 kg·hm-2 to 279.1 kg·hm-2, while N03--N in 0～90 cm soil layers showed the trends of increasing first, then decreasing in integration of water and fertilizer management area and traditional water and fertilization management area, but compared with traditional water and fertilization management area, leaching risk of excess N fertilization topdressing could be avoided in integration of water and fertilizer management area through increased topdressing count. At large flare stage and harvest stage, N03--N content in 0～180 cm soil layers decreased with increasing of soil depth. N03--N accumulation in 0～180 cm soil layers, total amount in traditional water and fertilization management area was the highest, which was 1 119.3 kg·hm-2 at large flare stage and 945.5 kg·hm-2 at harvest stage respectively, and the leaching risk was the largest. Therefore, water and fertilizer management practice as core of integration of water and fertilizer could achieve high yield of spring maize and environmental friendly in the northwest of Hebei province. |
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