Dairy manure and nitrogen fertilizer effects on residual nitrate and phosphate, and wheat yield in a sandy clay loam soil
2014
Iqbal, M. | Idowu, O. J. | Hassan, A. | Khan, A. | Amjad, M.
Dairy manure (DM) rates of [0 (DM ₀), 30 (DM ₃₀₎), 60 (DM ₆₀) Mg ha ⁻¹] and three nitrogen (N) rates [0 (N ₀), 125 (N ₁₂₅), 250 (N ₂₅₀) kg ha ⁻¹] were tested in a sandy clay loam, to evaluate their effects on growth and yield of wheat crop (Triticum aestivum L.), residual nitrate nitrogen (NO ₃-N) and phosphorus (P) concentrations in the surface soil, and selected soil physical measurements [saturated hydraulic conductivity (Ksat), and bulk density (BD)]. Increasing N and DM rates gave higher wheat yields, increased concentrations of residual NO ₃-N and P in the surface soil and improved Ksat and BD. Highest grain yield of 3.8 Mg ha ⁻¹ (70.3% more than the control) was observed in DM ₆₀ × N ₂₅₀ treatment. Residual accumulation of N-NO ₃ and P in the surface soil at high N and/or DM application rates suggests the need to carefully manage N and DM inputs on farm fields to avoid environmental contamination.
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