Across a landscape, soil texture controls the optimum rate of N fertilizer for maize production

• Published in: Field crops research Vol. 148; pp. 78 - 85
• Main Authors: Ziadi, Noura, Cambouris, Athyna N., Nyiraneza, Judith, Nolin, Michel C.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2013
• Subjects: Economic optimum N rate; Maize yield; N fertilizer rate; Residual soil nitrate; Zea mays; Canada, Quebec, Montreal; Canada; Maize yield; Residual soil nitrate; N fertilizer rate; Economic optimum N rate
• ISSN: 0378-4290; 1872-6852
• DOI: 10.1016/j.fcr.2013.03.023

•We assessed how within soil texture variations affect maize N response, soil N availability and residual soil nitrate.•We analyzed how N fertilization based on economic optimum N rate would help decreasing residual nitrate levels.•Soil texture variations affected maize N fertilizer response with higher yield and N uptake in coarse than in finesoils.•Nitrogen rate equivalent to economic optimum N rate would have allowed decreasing residual soil nitrate levels.•Variable rate N application according to soil texture and to the optimum N rate can reduce input production costs. In maize (Zea mays L.) production, appropriate N management needs to consider the specific relations between soil texture, growing season characteristics, and N fertilizer rates. Our main objective was to assess the interaction effect of soil texture (clay, clay loam, and fine sandy loam), and N fertilizer rates (0 to 250kgNha−1) on maize N response, soil N availability, and residual soil nitrate (RSN) at harvest. The study was conducted over three years (2000–2002) on a 15-ha field near Montreal (Canada). Crop responses parameters included yield, N uptake, and economic optimum N rate (Nop). Soil and crop-based measures of soil N availability indices were composed of nitrate desorbed from ion exchange membranes measured before (AEM-N1) and after seeding (AEM-N2). The effects of N fertilization, soil texture (fine sandy loam>clay loam>clay), were highly significant on maize yield and N uptake. Averaged across years, Nop was 181, 161, and 125kgNha−1 in the clay, clay loam, and fine sandy loam, respectively. Estimated RSN at Nop (13–77kgNO3-Nha−1) were much lower than the measured ones (22 to 173kgNO3-Nha−1). Nitrogen rate equivalent to Nop would have allowed decreasing RSN by 100kgNO3-Nha−1. Variable rate N application according to soil texture and to the Nop can reduce input production costs and therefore environmental risks by decreasing RSN.