The effects of different cultivation models and fertilizer application methods on N absorption and translocation of dryland winter wheat

Ridge and furrow planting(RF) and ridge film mulching planting(RFM) have been regarded as major approaches to conserving soil water and improving crop yield in dryland area,but only conventional fertilizer application method(broadcasting) has been used.Many researches showed that the method of band application under ridge could reduce N loss and increase N utilization efficiency,but little information is available about the effects of different cultivation conditions and fertilizer application methods on N adsorption and translocation at the stage of wheat grain filling.Therefore,the objective of this study was to investigate the characteristics of N absorption,distribution and transportation of winter wheat Xiaoyan 22 under different cultivation models and fertilization application methods under rain-fed conditions.Field experiment was conducted from 2004 to 2005 at the Agricultural Experimental Station of Northwest AF University,Yangling,Shaanxi province.The treatments included three cultivation models(conventional cultivation(CC),RF and RFM) and two fertilization application methods under the condition of ridge-furrow(conventional method(RFC) and fertilizer placement under ridge(RFR)).The main results indicated that the N accumulation amount in shoot under RF was significantly lower than CC at anthesis,but RF could significantly increase the amount of N accumulation in shoot and grain at maturity compared with that in CC,largely due to the increase of N absorption amount after anthesis.RFM accumulated more N in shoot and grain than CC.The contribution of post-anthesis N assimilation to grain N in RF was higher than that in CC,but the amount of N translocation from vegetative organs to grain was lower in RF compared with CC.RFM could not only improve post-anthesis N assimilation,but also stimulate the remobilization of stored N in vegetative organs to grain.The N accumulation amount of shoot and grain in RFR were higher than that in RFC,with an increase of 1.47 mg/stem and 1.75 mg/stem,respectively.