Scientia Agricultura Sinica ›› 2014, Vol. 47 ›› Issue (20): 4027-4035.doi: 10.3864/j.issn.0578-1752.2014.20.011

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION • Previous Articles     Next Articles

Effects of Combined Foliar Zn Application with N or P Under Different Water and Nitrogen Managements on Zn Nutritional  Quality of Winter Wheat

YAN Jian-mei, HE Bing-hui, TIAN Tai-qiang   

  1. College of Resources and Environment/Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, Southwest University, Chongqing 400715
  • Received:2014-05-12 Revised:2014-07-13 Online:2014-10-16 Published:2014-10-16

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Abstract: 【Objective】The characteristics of soil erosion and nitrogen losses caused by rainfall under different fertilizer application levels and tillage methods in the cropping of winter wheat-summer maize in purple soil area in Chongqing were studied in order to provide a theoretical evidence for the agricultural production and coordinate land management to improve the ecological environment.【Method】Four kinds of fertilizer levels (treatments of CK, combined application of manure and fertilizer, chemical fertilization, chemical fertilizer with increasing fertilization) and two kinds of tillage methods (chemical fertilization, contour plowing with chemical fertilizer) were designed in an experiment in runoff plots for a long term (2008-2012) observation to study the effect of soil erosion and nutrient loss. 【Result】There was a significant influence of runoff, sediment and nutrient loss on different fertilizer application levels and tillage methods, the runoff, sediment and nitrogen loss in the control group (CK) were the largest, contour plowing and fertilizer reduced the total volume of runoff, sediment and nutrient. The loss amount of the runoff, sediment and total nitrogen in contour plowing decreased by 25.9%, 20.5% and 33.4%, respectively, compared with the loss amount of the runoff, sediment and total nitrogen in cross-plowing plots. The loss amount of the runoff, sediment and total nitrogen in combined application of manure and fertilizer decreased by 35.7%, 40.5% and 41.2%, respectively, compared with that in chemical fertilization in CK. The runoff and the sediment showed a power function relationship (y=axb, a＞0, b＞0). The nutrient loss and the runoff showed a linear relation (y=ax+b, a＞0, b＞0), but no significant relation with precipitation. In dry land, Nitrogen loss was given priority to with total digestible nutrients (TDN), that accounted for the proportion of total nitrogen was 62.1%, combined application of manure and fertilizer can reduced the proportion of total digestible nutrients (TDN) and NH4+-N to total N.【Conclusion】In the purple soil, longitudinal ridges should not be adopted and fertilizer should be used. Contour plowing with chemical fertilizer and combined application of manure and fertilizer was an effective means to prevention and cure of soil erosion and runoff in Chongqing purple slope, the nitrogen lost by total digestible nutrients (TDN) with the runoff.

Key words: fertilizer levels, tillage methods, nutrient loss, soil erosion, purple soil

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