Effect of residual fertilizer N, lime and Bradyrhizobium inoculum on groundnut yield, N uptake and N2 Fixation

Reddy, G.B. and Mapiki, A. and Singh, B.R. (1998) Effect of residual fertilizer N, lime and Bradyrhizobium inoculum on groundnut yield, N uptake and N2 Fixation. Acta Agriculturae Scandinavica, Section B - Soil & Plant Science , 48 (2). pp. 91-99.

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Groundnut (Arachis hypogaea L.) is known to be effective in symbiotic N2 fixation, but uncertainty remains concerning the magnitude of this process, especially when this crop is grown under acid conditions with different N management systems. This study was conducted to determine the effect of previously applied fertilizer N and previously applied lime rates on groundnut yield, 15N concentration, total N uptake and N2 fixation. Previously applied N rates were 0, 80, 160 and 240 kg N ha‐1 as NH4NO3 to main plots or labelled‐N rates of 0, 40, 80 and 120 kg NO3‐N ha‐1 to microplots as NH4 I5NO3. The lime was previously applied at the rates of 0 and 2 Mg ha‐1 to the preceding maize (Zea mays L.) crop. The effect of inoculum was also investigated. Nodulating isoline, groundnut cv Chalimbana seed was treated with Bradyrhizobium peat inoculum containing Bradyrhizobium sp. (inoculant strain TAL 1000) 105 cells per seed. Non‐nodulating isoline PI 109839/NC AC17090 (NFN‐43) and nodulating isoline Chalimbana were grown in the field during the 1989/90 cropping season on a Misamfu red sandy loam soil at Kasama, Zambia. Whole‐plant dry matter production or kernel yield and total N uptake of non‐nodulating plants were lower than those of the nodulating plants. Total N uptake by whole‐plant dry matter in all plants was higher in a treatment previously supplemented with 160 kg N ha‐1 than in 80 kg N ha‐1. Residual lime increased kernel yield and N2 fixation in nodulating plants. The amounts of fertilizer 15N uptake by plants increased with labelled previously applied fertilizer N rates. The higher recovery of previously applied labelled N fertilizer in nodulated than in non‐nodulated plants was due to differences in dry matter production. Previously applied higher N fertilization rates (greater than 160 kg N ha‐1) with previously applied lime reduced N2 fixation. Lime enhanced N2fixation by the isotope dilution (ID) method. Groundnut inoculation seems to be a viable technology, since it increases in plant dry matter production and grain yield.

Item Type: Article
Uncontrolled Keywords: Arachis hypogaea, N2fixation, yield, 15N uptake, nodulation, previously applied fertilizer N, previously applied lime, total N
Author Affiliation: Department of Natural Resources and Environmental Design, North Carolina A&T State University, Greensboro, NC, 27411, USA b Department of Soil and Water Sciences, Agricultural University of Norway, NO‐1432, Ås, Norway
Subjects: Plant Protection
Divisions: Groundnut
Depositing User: Mr. SanatKumar Behera
Date Deposited: 13 Mar 2012 06:28
Last Modified: 13 Mar 2012 06:30
Official URL: http://dx.doi.org/10.1080/09064719809362485
URI: http://eprints.icrisat.ac.in/id/eprint/3827

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