DAIRY MANURE AND NITROGEN FERTILIZER EFFECTS ON RESIDUAL NITRATE AND PHOSPHATE,AND WHEAT YIELD IN A SANDY CLAY LOAM SOIL |
| |
| Authors: | M Iqbal O J Idowu A Hassan A Khan M Amjad |
| |
| Institution: | 1. Institute of Soil and Environmental Sciences , University of Agriculture , Faisalabad , Pakistan;2. Department of Extension Plant Sciences , New Mexico State University , Las Cruces , New Mexico , USA |
| |
| Abstract: | Dairy manure (DM) rates of 0 (DM0), 30 (DM30)), 60 (DM60) Mg ha?1] and three nitrogen (N) rates 0 (N0), 125 (N125), 250 (N250) 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 (NO3-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 NO3-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 DM60 × N250 treatment. Residual accumulation of N-NO3 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. |
| |
| Keywords: | manure nitrogen phosphorus nitrate accumulation wheat yield |
|
|
