2015和2016年在大田试验条件下,研究了不施肥(CK)、常规施肥 (简写为NPK)、常规施肥+有机肥(增施鸡粪1500kg/hm2,简写为NPKM)对夏玉米物质生产及土壤特性的影响。结果表明,与CK相比,NPK和NPKM两个处理2015和2016年玉米产量分别增加13.62%和18.61%、36.75%和44.93%。SPAD值、植株根系和地上部生物量均表现为NPKM>NPK>CK。与CK 相比,增施有机肥后,土壤呼吸、硝态氮、铵态氮含量、脲酶、蔗糖酶活性均显著增高,过氧化氢酶活性降低。相关分析表明连续两年玉米籽粒产量均与拔节、吐丝、成熟期的SPAD和硝态氮含量呈显著正相关,且与吐丝和成熟期的根系生物量、地上部生物量、蔗糖酶活性呈显著正相关。
英文摘要:
Field experiments with three treatments [Control: CK; conventional fertilization: NPK; conventional fertilization + organic fertilizer (chicken manure increased 1500kg/hm2): NPKM] were conducted to study the effect of adding organic fertilizer on summer maize production and soil properties in 2015 and 2016. The results showed that in comparison with CK, NPK and NPKM treatments increased maize yield by 13.62% and 18.61%, 36.75% and 44.93% in 2015 and 2016, respectively. The SPAD value, root and aboveground biomass showed the patterns: NPKM>NPK>CK. Compared with CK, soil respiration, NO3—N, NH4+-N, urease and saccharase activities of NPK and NPKM treatments increased significantly, while catalase activity decreased. Correlation analysis showed that maize grain yield were significantly and positively correlated with SPAD and soil NO3--N content at jointing, silking and mature stage, and with root biomass, aboveground biomass and saccharase activity at silking and mature stage.
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