Effects of Nitrogen and Density on Summer Maize Yield and Nitrogen Use Efficiency

doi:10.7668/hbnxb.20190333

Abstract

Abstract: In order to study the effects of nitrogen application on summer maize yield and nitrogen use efficiency under different plant density, a two-factor randomized block test design was conducted by Jingnongke 728(JNK728). The results showed that, maize ear leaf SPAD values increased significantly with nitrogen application increasing, and compare with N180, leaf ares index (LAI) and dry matter per plant (DM) were increased significantly under N300, N360. JNK728 leaf SPAD after silking and DM were significantly decreased with density increase under same N treatments, while LAI among V12 to R1+20 growth period increased significantly. Summer maize yield increased significantly with nitrogen application higher than 240 kg/ha by ear line number and 1000-grain weight increased under D7.5, while only by line grain number under D9.0. As well as, yield increased by ear number increased with density increasing. The N partial factor productivity (PFPN) significantly reduced 31.2%-72.3% with increasing N application, while nitrogen agronomic use efficiency (ANUE) increased 12.5%-52.6%. Maize PFPN and ANUE increased significantly by density increasing. In conclusion, the summer maize had resistant to lodging character under plant density was 7.5×10⁴ plants/ha could obtained 9.5×10³ kg/ha by nitrogen application lower than 300 kg/ha, while density increased to 9.0×10⁴ plants/ha, nitrogen application should amonge 300-360 kg/ha could obtain higher yield of 12.0×10³ kg/ha.

Key words: Nitrogen application, Plant density, Summer maize, Yield, Nitrogen use efficiency

CLC Number:

S513
S143.1

LIU Meng, LIANG Qian, GE Junzhu, ZHENG Zhiguang, ZHANG Yao, MA Zhiqi, WU Xidong, YANG Yongan, HOU Haipeng. Effects of Nitrogen and Density on Summer Maize Yield and Nitrogen Use Efficiency[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(6): 153-159. doi: 10.7668/hbnxb.20190333.

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