Research Articles
Vol. 13 No. sp2 (2026): Recent Advances in Agriculture
Optimising wheat productivity through graded nitrogen, phosphorus and potassium fertilisation and rice-straw biochar-farmyard manure integration in the rice-wheat system of Punjab
Department of Agronomy, Lovely Professional University, Jalandhar 144 411, Punjab, India
Department of Agronomy, Lovely Professional University, Jalandhar 144 411, Punjab, India
Department of Agronomy, Lovely Professional University, Jalandhar 144 411, Punjab, India
Department of Agronomy, Lovely Professional University, Jalandhar 144 411, Punjab, India
Abstract
A field experiment was conducted during rabi 2024–25 at Lovely Professional University, Phagwara, Punjab, to evaluate graded nitrogen, phosphorus, potassium (NPK) fertiliser levels [100 % recommended dose of fertilisers (RDF) vs. 75 % nitrogen (N) with varying phosphorus - potassium (P–K) combinations] and organic amendments [control, 5 t ha–1 rice-straw biochar, 7.5 t ha–1 farmyard manure (FYM), 50:50 biochar: FYM] on wheat (Triticum aestivum L. cv. PBW 826) grown in nutrient-poor sandy loam [0.49 % soil organic carbon (SOC)] under rice–wheat rotation. Using a strip-plot design (3 replications) measurements included growth, physiological parameters [relative water content (RWC), membrane stability index (MSI), chlorophyll] and yield. 100 % RDF (M1) significantly outperformed deficient treatments, recording 24–35 % greater plant height (PH), 38–64 % more tillers, 32–97 % higher RWC/MSI/chlorophyll and 47 % greater grain yield (GY) (56.00 q ha–1) vs. M5 (38.21 q ha–1). Combined biochar: FYM (T4) proved superior among amendments, enhancing growth (10–17 %), physiological parameters (14–25 %) and yield (14 % over control; 50.13 q ha–1) through biochar's nutrient retention and FYM's labile N/microbial stimulation. Non-significant interactions indicated additive effects, with M1+T4 optimal. Biochar's porosity improved water retention/microbial habitats; full NPK sustained photosynthesis/remobilisation for grain filling. Potassium (K) omission caused severe penalties in vegetative/grain growth, underscoring the need for balanced nutrition. Results demonstrate that integrated 100 % RDF + 50:50 biochar: FYM optimises productivity (exceeding the Punjab average of ~45 q ha–1), valorises rice residue (mitigating stubble burning) and builds soil health in Punjab's depleted loams-offering sustainable integrated nutrient management (INM) for rice-wheat systems.
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