PJB-2010-446
WHEAT NITROGEN INDICES RESPONSE TO NITROGEN SOURCE AND APPLICATION TIME
MOHAMMAD TARIQ JAN1, MOHAMMAD JAMAL KHAN2, AHMAD KHAN1, MOHAMMAD ARIF1, MOHAMMAD SHAFI1 AND FARMANULLAH3
Abstract
The unnecessary inputs costs to farmers due to N losses can be optimized by developing a sound fertilizer strategy. The optimization for improved wheat productivity, N re-translocation, utilization and use efficiencies can be achieved through source and timing of N application. Thus, an experiment was carried out at the Research Farm of KPK Agricultural University Peshawar during 2005-06 to test the effects of sources and timing of N application on wheat biological yield and N indices. Nitrogen sources were ammonium (NH4-N) and nitrate (NO3-N) applied @ 100 kg ha-1 at three different stages i.e., at sowing (S1), tillering (S2) and boot stage (S3). Ammonium-N increased wheat biological yield and total N uptake whereas nitrogen utilization efficiency was increased with NO3-N. Split N at sowing, tillering and boot stages had increased the biological yield and apparent N re-translocation, whereas total-N uptake and N harvest index was higher for full application of N at boot stage. Nitrogen application had almost double the N uptake compared to control and increased 27% N re-translocation regardless of sources and application time. It was concluded from the experiment that split application of N had higher wheat productivity and re-translocation, whereas full and delayed N dose increased N harvest index compared to other treatments. Thus, split N application is recommended for improved biological yield, whereas for improved quality of grains the delayed application of N at boot stage is preferable in agro-climatic conditions of Peshawar.
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