| In order to explore the technological approach to increase yield under plastic film mulching in fallow period matching with nitrogen fertilization, field experiment was carried out in Wenxi, Shanxi with nitrogen application amounts of 75, 150 and 225 kg·hm-2 under plastic film mulching and no mulching in fallow period to explicit the effect of mulching in fallow period and nitrogen application amount on water and nitrogen use efficiency, and grain yield in dryland wheat. The results showed that after mulching in fallow period, soil water storage during sowing to booting stage at the depth of 0~300 cm were significantly improved, which improved by 70~81 mm at sowing, and while combined with middle nitrogen, the effect on water retention could be extended to booting stage, yield and water use efficiency of wheat were improved. After mulching in fallow period, N accumulation at different growth stages was significantly improved, nitrogen accumulated before anthesis (NTBA) and nitrogen accumulated after anthesis (NAAA) were improved, so grain N accumulation was significantly improved, and the effects of mulching with middle nitrogen was better. Mean while, N harvest index and N productive efficiency were improved. In all, mulching in fallow period in dryland wheat had a better soil moisture conservation, improved soil water storage in earlier and interim stages, the effect on water retention could be extended to booting stage, finally improved water use efficiency; it was helpful to promote the absorption, accumulation and translocation of nitrogen, finally improved grain N accumulation, meanwhile mulching with N fertilization about 150 kg·hm-2 was better for improving N harvest index and N productive efficiency. |
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