| Effects of nitrogen rate on soil nitrate-N, yield and nitrogen use efficiency of double-ridge furrow sowing with full plastic film mulching for maize in dryland |
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| DOI：10.7606/j.issn.1000-7601.2015.06.10 |
| Key Words: nitrogen rate spring maize soil NO3--N accumulation double-bed and furrow-sowing culture yield nitrogen use efficiency |
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| Abstract: |
| In this paper, to solve the issues of unreasonable fertilizer application and lower nitrogen use efficiency, the effects of nitrogen rate on soil NO3--N, yield and nitrogen use efficiency of maize were studied by using randomized block design started from 2011 to 2012.The results revealed that the yield increased with the increase of nitrogen rate and reached the highest grain yield of 4 922.22 kg·hm-2 under N rate of 180 kg·hm-2 in 2011 and 10 267.06 kg·hm-2 under N rate of 225 kg·hm-2 in 2012. The accumulation of NO3--N at 200 cm soil layer was increased with nitrogen inputs wad increased, peaking at 501.65 kg·hm-2 in 2011 and 422.07 kg·hm-2 in 2012. The NO3-1-N accumulation at 0～200 cm soil layer of different nitrogen treatments varied significantly with planting year. The nitrogen use efficiency was increased and reached 25.13% at nitrogen rate of 180 kg·hm-2 and then decreased. Optimum nitrogen rate can increase the yield and nitrogen use efficiency, reduce the soil accumulation of NO3--N at 200 cm soil layer, thus reducing the potential threat to the environment. |