|Author:||Dang, TingHui ; Cai, GuiXin ; Guo, ShengLi ; Hao, MingDe ; Heng, L. K.|
|Book Group Author:||NA|
A field experiment with four treatments and four replicates in a randomized complete block design was conducted at the Changwu Experimental Station in Changwu County, Shaanxi Province, of Northwest China from 1998 to 2002. The local cropping sequence of wheat, wheat-beans, maize, and wheat over the 4-year period was adopted. A micro-plot study using 15N-labelled fertilizer was carried out to determine the fate of applied N fertilizer in the first year. When N fertilizer was applied, wheat (years 1, 2 and 4) and maize (year 3) grain yield increased significantly (P<0.05) (>30%), with no significant yield differences in normal rainfall years (years 1, 2 and 3) for N application at the commonly application rate and at 2/3 of this rate. Grain yield of wheat varied greatly between years, mainly due to variation in annual rainfall. Results of 15N studies on wheat showed that plants recovered 36.6-38.4% of the N applied, the N remained in soil (0-40 cm) ranged from 29.2 to 33.6%, and unaccounted-for N was 29.5-34.2%. The following crop (wheat) recovered 2.1-2.8% of the residual N from N applied to the previous wheat crop with recovery generally decreasing in the subsequent three crops (beans, maize and wheat).
|Pages:||495 - 504|
application rates, crop yield, cropping systems, maize,nitrogen, nitrogen fertilizers, plant water relations, rain, transportprocesses, urea, water use efficiency, wheat, China, Shaanxi, Triticum,Triticum aestivum, Zea mays, East Asia, Asia, Developing Countries,North Western China, China, Triticum, Poaceae, Cyperales,monocotyledons, angiosperms, Spermatophyta, plants, Zea, corn, rainfall,rainfed farming, Shensi, soil transport processes, transport processesin soil systems, Field Crops (FF005) (New March 2000), Plant WaterRelations (FF062), Plant Production (FF100), Plant Cropping Systems(FF150), Fertilizers and other Amendments (JJ700)