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Chinese Agricultural Science Bulletin ›› 2014, Vol. 30 ›› Issue (30): 83-88.doi: 10.11924/j.issn.1000-6850.2014-1367

Special Issue: 油料作物 园艺

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Effect of Controlled Release Nitrogen Fertilizer on Rapeseed Yield, Agronomic Characters and Soil Fertility

  

  • Received:2014-05-13 Revised:2014-05-13 Accepted:2014-08-18 Online:2014-10-31 Published:2014-10-31

Abstract: In order to study the effects of controlled release nitrogen fertilizer (CRNF) on rapeseed, a simulated experiment was adopted with 3 types of paddy soils in Dong-Ting Lake area after 4-years of continuous applying CRNF under double rice cropping and fallow system and the fallow changed to rapeseed. The effect of controlled release fertilizer on rapeseed yield, agronomic characters and soil fertility were studied in this paper. The results showed that CRNF improved the growth of rapeseed plant and the highest grain yield occurred in CRNF treatments in purple calcareous clayed paddy soil (PCS) and alluvial loamy paddy soil (ALS) which increased by 12.2% and 9.8%, respectively, compared with applying urea (CF treatment). Yield in 70% CRNF treatment decreased obviously compared with CF treatment. Contents of available N and organic carbon in soil increased by 25.0% and 3.2% after rapeseed cropping than before rapeseed cropping under CRNF treatment in ALS, and available N increased by 13.5% in PCS. Both rapeseed yield and soil fertility under CRNF treatment and 70% CRNF treatment were lower than that under CF treatment in reddish yellow clayed paddy soil (RYS). The results indicated that the effects on grain yield and soil nitrogen fertility improvement of applying CRNF on rapeseed in PCS and ALS were relatively obvious.