Effect of Different Fertilizer Application Countermeasures on Yield,Quality of Romanesco Broccoli and Nitrogen Balance

DUN Hui-ning1,2,WU Jian-xin2,ZUO Qiang2,XUE Shi-chuan1,ZOU Guo-yuan2,GU Jia-lin2,ZHANG Lin2(1.College of Resource and Environmental Science,Agricultural University of Hebei,Baoding,Hebei 071000;2.Institute of Plant Nutrition and Resources,Beijing Academy of Agricultural and Forestry Sciences,Beijing 100097)

Romanesco Broccoli;control-released fertilizer;yield;nitrate;N balance

Field experiment was conducted in greenhouse in the suburb of Beijing to determine the effect of different fertilizer application countermeasures(conventional fertilization,optimized fertilization with catch crop and C/N ratio,control-released fertilizer) on yield and quality of Romanesco Broccoli,and the soil nitrate content and apparent N balance of Soil-Romanesco Broccoli system were analyzed.The results showed that different fertilizer application countermeasures increased yield by 14.75%~21.54%,and N uptake by 12.65%~15.51%.The nitrate content of Romanesco Broccoli edible department between different fertilizer processing were followed by CON>OCC>CRF1>CRF2.After Romanesco Broccoli harvested,Nmin contents in the soil profile(0~200 cm) were:CON>CRF1>CRF2>OCC>CK.Contract with CON,optimized fertilization with catch crop and C/N ratio and applying control-released fertilizer decreased Nmin accumulation and reduced N surplus of soil-plant system by 45.17%,21.40% and 31.73%,respectively.Some effective methods,such as reducing nitrogen rate,nitrogen-catch crop,C/N ratio and control-released fertilizer application,were put forward to reduce nitrogen leaching and improve use efficiency.