氮肥与新型增效剂配施对夏玉米生长及产量的影响

摘要

Effects of N fertilizer combined with new synergist on summer corn growth index,yield and yield components,economic benefits and N fertilizer efficiency were studied by field experiment.The results showed that combined application of N fertilizer and new synergist could significantly improve stem diameter, ear leaf area,cob length of summer corn,increase kernels per row and 1 000 -grain weight,and improve AEN and PFPN.It also could save cost and improve economic benefit with N fertilizer application amount de-creasing by 60 kg/hm2 and income increasing by 346 yuan /hm2 .The new synergist (N -server)was better than traditional synergist (DCD),and higher dosage was better than lower one on summer corn growth and yield.Under the condition of this field trial,the optimal application amount of new synergist (N -server)was 5.1 30 L/hm2 .%通过田间试验研究了氮肥与新型增效剂配施对夏玉米生长发育、产量及其构成因子、经济效益、氮肥效率的影响。结果表明，氮肥与新型增效剂配施能够显著提高玉米的茎粗、穗三叶面积、果穗长，增加果穗的行粒数和千粒重，提高氮肥偏生产力和农学效率；氮肥与新型增效剂配施节本增效效果明显，可降低纯氮用量60 kg／hm2，增收346元／hm2。新型增效剂效果优于普通氮肥增效剂 DCD，而且高用量好于低用量，在本试验条件下，新型增效剂的最佳用量为5．130 L／hm2。