Response of maize to ammonium nitrate, urea and cogranulated urea-urea phosphate
作者:
O.A. Yerokun,
期刊:
South African Journal of Plant and Soil
(Taylor Available online 1997)
卷期:
Volume 14,
issue 2
页码: 63-66
ISSN:0257-1862
年代: 1997
DOI:10.1080/02571862.1997.10635083
出版商: Taylor & Francis Group
关键词: Maize yield;cogranulated urea-urea phosphate;ammonium nitrate;nitrogen fertilizers;ammonia volatilization
数据来源: Taylor
摘要:
Urea fertilizers may lose N by ammonia volatilization when applied in the field. In order to reduce this loss, modified urea compounds are being used. Not all of them reduce ammonia loss and improve crop yields. A field study was conducted to evaluate the comparative advantage of cogranulated urea-urea phosphate (340 g N kg−1, 73 g P kg−1) over urea (460 g N kg−1) and ammonium nitrate (350 g N kg−1) when supplied as nitrogen fertilizers to maize. The fertilizer granules were applied at rates of 67, 134 and 202 kg N ha−1, as surface-broadcast or soil-incorporated treatments. Fertilizer application increased crop yields and nitrogen uptake, but the sources were not significantly different from each other. Increasing nitrogen supply up to 134 kg N ha−1improved maize yield and nitrogen uptake. Incorporating the fertilizer with the soil was not better than surface application. The data available suggest that maize responded to cogranulated urea-urea phosphate, urea and ammonium nitrate similarly.
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