Author(s): P. VEERAMANI, K. SUBRAHMANIY AN, K. ARULMOZHISELVAN AND R. MUTHUKRISHNAN

Abstract: A field experiment was carried out at Regional Research Station, Tamil Nadu Agricultural University, Vridhachalam to quantify the amount of nitrogen fixed by different parts of groundnut and investigate their response to organic and inorganic fertilizer by 15N techniques. Distribution of fertilizer N from source to sink assessed by 15N tracer clearly indicated that kernel was the major sink attracting N in groundnut. The fertilizer N absorbed by the different plant parts were high when N was split applied at early growth stages and moved to kernel at harvest. Based on the results, it could be stated that split application of N is effective to fulfill the crop requirement of N for maturity of kernel and oil content.

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