| Effects of mulching patterns on spatio-temporal variation of soil nitrate and nitrogen utilization efficiency of maize on dry land |
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| DOI：10.7606/j.issn.1000-7601.2011.05.05 |
| Key Words: Mulching Loess plateau Nitrate Nitrogen use efficiency Maize |
| Author Name | Affiliation | | ZHANG Xianmei | College of Resource and Environment Science, Lanzhou, Gansu 730070, China | | HUANG Gaobao | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070， China | | LI Lingling | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070， China | | XIE Junhong | College of Agronomy, Gansu Agricultural University, Lanzhou, Gansu 730070， China | | CHEN Hong | College of Resource and Environment Science, Lanzhou, Gansu 730070, China |
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| Abstract: |
| A field experiment in Lijiabu, Dingxi City of Gansu province, was carried out based on improving nitrogen use efficiency and reducing the pollution of nitrogen fertilizer. Four treatments, namely flat-planting with no mulching (NM), half-mulching and flat-planting(HM), complete mulching and flat-planting(CM), completely mulched alternating narrow and wide ridges with furrow planting(CMRF), were designed to study accumulation of residual NO
3--N and dynamic accumulation and distribution of dry matter and nitrogen use efficiency. The results showed that in the whole growth period of mulching treatments NO3--N content of 0～10 cm soil layer was highest and were significantly higher than that of NM, indicating there existed NO3--N surface accumul
ation in mulching treatments. NO3--N content of all treatments under 140 cm soil layer was accumulated. The average nitrogen accumulation in the whole growth period was: CMRF＞CM＞HM＞NM. Compared with CM and NM, grain nitrogen accumulation of CMRF was increased by 20.48% and 87.87%, showing that CMRF significantly enhanced plants nitrogen utilization from soil, as well as transport of nitrogen to grain Biomass yield of CMRF was 37.60% higher than that of HM, maize yield was increased by 49.84%, and nitrogen harvest index was significantly increased by 22.55% compared with HM. During different treatments nitrogen use efficiency of maize was significantly different at 0.05 level, CMRF was significantly increased by 53.98% than NM. |
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