Effects of Irrigation and Fertilization on Spatial-temporal Variations of NH4+-N and NO3--N in Soybean Fields

doi:10.7668/hbnxb.2014.S1.057

Abstract

Abstract: To seek a rational way of utilizing water and fertilizer,taking Jiunong 21 as material,the effect of irrigation and fertilization on spatial-temporal variations of NH₄⁺-N and NO₃^--N in soybean fields in 2008 was studied.The results showed that,seen from NH₄⁺-N and NO₃^--N in different soil layers,optimized fertilization treatment has obvious effect on keeping NH₄⁺-N and NO₃^--N in soil,especially at R1 and R5 stages,reducing the loss of soil nitrogen.By the regionalized variable theory and semivariance of geostatistics,seen from range value,irrigation has larger effect on spatial variability of soil NH₄⁺-N and NO₃^--N of optimized fertilization treatment;and smaller C0/C value,0.02 and 0.21,respectively,indicating that spatial structure was the main cause of spatial variability,thus optimized fertilization treatment has a good effect on changing soil spatial structure.

Key words: Soybean, Soil, Irrigation, Fertilization mode, NH₄⁺-N, NO₃^--N, Semivariance, Spatial-temporal variations

CLC Number:

S565.1

ZHAO Jing, WANG Shu-wen, QIU Qiang, ZHANG Bao-gui, ZHANG Wei, ZHANG Ming-hao, YAN Xiao-yan, FENG Li-ping, LIU Qing-jun, LIU Shu-qin. Effects of Irrigation and Fertilization on Spatial-temporal Variations of NH₄⁺-N and NO₃^--N in Soybean Fields[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(S1): 305-309. doi: 10.7668/hbnxb.2014.S1.057.

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