Impact of different rates of NP fertilizers and irrigation on yield components of maize (Zea mays L.), NH4-N and NO3-N losses at various soil depths

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Research Paper 01/06/2015
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Impact of different rates of NP fertilizers and irrigation on yield components of maize (Zea mays L.), NH4-N and NO3-N losses at various soil depths

Babar Hussain, Khadim Dawar, Aqleem Abbas, Sohail Ahmad, Izhar Shafi, Nasrullah, Waseem Ali, Murtaza Ali
J. Bio. Env. Sci.6( 6), 225-239, June 2015.
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The present experiment was carried out at New Developmental farm, of the University of Agriculture, Peshawar to study the effect of different rates of nitrogen, phosphorus fertilizers and irrigation on total N, NH4-N and NO3-N at various soil depths in maize crop (Zea mays L). The experimental design was randomize complete block design with split plot arrangement.Irrigation with two levels (Irrigation at the same day, Irrigation after 5 days) was kept in main plot whereas different fertilization treatments N (50, 100, 150 kg ha-1) and P (0, 60, 90 kg ha-1) were arranged in subplot.The results showed that the treatments combinations (N @ 150 kg ha-1 and P @ 90 kg ha-1) N3P3, (irrigation at the same day and N @ 150 kg ha-1) I1N3, and (irrigation at the same day and P @ 90 kg ha-1) I1P3 yielded maximum grain yield and biological yield. It was observed that among soil chemical properties total mineral nitrogen N, NH4-N and NO3-N concentration at upper soil surface, sub soil surface and at the depth (0-15cm) maximum values were recorded highest at treatments combinations N3P3(N @ 150 kg ha-1 and P @ 90 kg ha-1), I1N3(irrigation at the same day and N @ 150 kg ha-1) and I1P3(irrigation at the same day and P @ 90 kg ha-1) while the maximum losses were also recorded in the same treatment combinations. It was apparent from the present study that distribution of urea in the rooting zone has the potential to enhance N use efficiency and minimize N losses via ammonia volatilization. Moreover irrigation after application of Urea and Single superphosphate (SSP) is recommended which can cause these fertilizers to diffuse from upper surface to sub surface and can be easily uptake by plants consequently maximum yield components can be obtained.


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