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Effects of water table depth on nitrogen accumulation and pod yield of peanut

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A field experiment was carried out in 1983-84 at Tarboro, North Carolina on a sandy loam (Typic Umbraquults) soil with groundnuts cv. Florigiant. The experimental area was located on a lateral of the main channel of a PL-566 drainage district that was equipped with a water table management structure. Water table depths (WTD) of 0.61, 0.76, 0.91, 1.07 or 1.22 m were obtained from natural variations in the surface elevation. Pod yields ranged from 3.5-5.5 t/ha and were ≥4.0 t/ha if WTD were ≤0.91 m. DM accumulation, acetylene reduction and pod yield were negatively correlated with WTD in the first year, but there were no meaningful correlations between plant characteristics and WTD in the second year. When nitrogen fixation was assumed to provide 45% of the total N, estimated N accumulations were negative and poorly correlated with depth in the drier year. In the wetter year, estimates of net soil N accumulation ranged from 64-4 kg/ha.
Hunt, P.G. , Matheny, T.A. , Wright, F.S. , Doty, C.W.
Includes references
Journal of soil and water conservation Nov/Dec 1993. v. 48 (6)
Journal Articles, USDA Authors, Peer-Reviewed
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