A 15N tracer study to evaluate the effects of nitrogen and copper fertilization on fertilizer nitrogen efficiency in rice production

• Main Authors: Choudhury, Abu Turab Mohammad Ali, Yusop, Mohd. Khanif
• Format: Article
• Language: English
• Published: Pakistan Council of Scientific and Industrial Research 2009
• Online Access: http://psasir.upm.edu.my/id/eprint/12641/1/A%2015N%20tracer%20study%20to%20evaluate%20the%20effects%20of%20nitrogen%20and%20copper%20fertilization%20on%20fertilizer%20nitrogen%20efficiency%20in%20rice%20production.pdf; http://psasir.upm.edu.my/id/eprint/12641/

In the study of the effects of nitrogen and copper fertilization on rice yield when four rates of N (0, 60, 120 and 180 kg N/ha) as 15N labelled urea and three rates of Cu (0, 5 and 10 kg Cu/ha) were applied, grain yield increased significantly with increasing N rates upto 120 kg N/ha. The recovery of fertilizer N was around 40% irrespective of N and Cu rates. Copper application at 10 kg/ha increased grain yield by 0.53 t/ha insignificantly. Cu content in the straw was below the critical deficiency level of 6 mg/kg. Thus higher rate of Cu fertilizer (above 10 kg/ha) in soil increase rice yield and fertilizer N efficiency if Cu is applied as basal. Alternately, Cu may be applied as foliar spray on standing crop to avoid Cu adsorption in the soil.