136-7 Blends of Conventional and Slow-Release Urea in Corn: Effects in Early Growth.

Poster Number 2011

See more from this Division: SSSA Division: Soil Fertility & Plant Nutrition
See more from this Session: Enhanced Efficiency Nitrogen Sources

Monday, November 4, 2013
Tampa Convention Center, East Exhibit Hall

Lucas Peres Miachon Sr.1, Hugo Gonzalez Villalba Sr.2, Evandro Luiz Schoninger Sr.3, João Luís Souza4, Bruna Arruda5 and Paulo C. Ocheuze Trivelin Sr.3, (1)Soil Science, ESALQ, University of Sao Paulo, Piracicaba, Brazil
(2)Soil Science, ESALQ, Escola Superior de Agricultura, Universidad de Sao Paulo, Piracicaba, BRAZIL
(3)Stable Isotope Laboratory, CENA, University of Sao Paulo, Piracicaba, Brazil
(4)ESALQ, University of Sao Paulo, Piracicaba, Brazil
(5)Soil Science, ESALQ, University of Sao Paulo, Piracicaba, BRAZIL
Abstract:
The adequate nitrogen (N) supply to corn crops plays important role in high yielding environments. However, N improper usage can result in poor fertilizer N use efficiency, profitability and hazardous environmental effects.   Polymer coated urea (slow-release urea, PCU) has proven to be an effective approach in increasing nitrogen use efficiency in a number of production systems. A study was carried out in Piracicaba, Brazil, 2012/2013 growing season, in a clayey oxisol.  Four different strategies of nitrogen fertilization in corn were used: (i) split-applied urea (U); (ii) urea applied at planting; (iii) PCU applied at planting; (iv) blend of U and PCU (50%U/50% PCU) applied at planting and (v) control (without nitrogen). The nitrogen rate was 180 kg N ha-1. The fertilizers applied at seeding were placed in bands 5 cm depth and 5 cm aside the corn seeding row. The split-applied urea treatment consisted in 40 kg N ha-1 at planting and the remaining 140 kg ha-1 sidedressed at V4.  The experiment design was randomized blocks with four replications. To estimate dry matter yield, four plants per plot were collected at 25, 44 and 81 day after plant emergence (DAE) (V6, V14 and R3 corn stages) oven-dried and weighted. All data were analyzed using analysis of variance (ANOVA). Means were separated using test t (LSD) at probability level of P ≤ 0.05. The treatmens consisting in U applied in soil band-application at seeding and the blend (50%U/50% PCU) resulted in higher V6 leaf stage dry matter yield than split-applied urea and PCU applied at seeding. This difference disappeared in later stages of corn (V14 and R3) and differed only for untreated treatment (control).

See more from this Division: SSSA Division: Soil Fertility & Plant Nutrition
See more from this Session: Enhanced Efficiency Nitrogen Sources