Title: Soil test crop response correlation studies under integrated plant nutrition system for onion (Allium cepa L. var. aggregatum) in inceptisols of Tamil Nadu
Abstract: Soil test crop response correlation studies were conducted with onion (var. CO.4) under integrated plant nutrition system (STCR-IPNS) in Inceptisols of Tamil Nadu during 1998–99. Fertilizer adjustment equations under IPNS were formulated for onion following Ramamoorthy's inductive-cum-targeted yield model. The nutrient requirement for producing one quintal of fresh onion bulbs was found to be 0.375, 0.329 and 0.466 kg of N, P2O5 and K2O, respectively. The per cent contributions from soil and fertilizer nutrients were found to be 14.13 and 38.28 for N, 35.33 and 56.61 for P2O5 and 14.33 and 70.03 for K2O respectively. Likewise, the per cent contributions from farmyard manure (FYM), and FYM plus Azospirillum (Azo) were 20.32 and 22.51 for N, 16.55 and 17.12 for P2O5 and 25.17 and 25.66 for K2O respectively. The per cent contribution of N from Azospirillum was found to be 22.38. The quantity of fertilizers that could be adjusted to the levels and sources of organic manures was evaluated to be 36, 15 and 27 kg ha−1 of N, P2O5 and K2O, respectively for fertilizers with FYM; 12 kg N ha−1 for fertilizers with Azospirillum and 52, 16 and 27 kg ha−1 of N, P2O5 and K2O, respectively for fertilizers with FYM plus Azospirillum.
Publication Year: 2002
Publication Date: 2002-01-01
Language: en
Type: article
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