Ammonium sulphate on maize crops under no tillage

Bragantia

Maria Anita Gonçalves Da Silva²  Anny Rosi Mannigel²  Antonio Saraiva Muniz²  Simone Maria Altoé Porto²  Marlene Estevão Marchetti¹  Antonio Nolla¹  Rosemary Marques De Almeida Bertani¹ 

[1] ,Universidade Estadual de Maringá Departamento de Agronomia Maringá PR ,Brasil

关键词: Zea mays;    Triticum aestivum;    fertilizer management;    nitrogen;    sulfur;    Zea mays;    Triticum aestivum;    manejo da adubação;    nitrogênio;    enxofre;   

DOI  :  10.1590/S0006-87052012000100014

来源: SciELO

【 摘 要 】

The objectives of this work were to evaluate the management of N and S (as ammonium sulphate) fertilization under no-tillage system on the components of maize productivity and on N and S accumulation in the crop, as well as to evaluate the minimum value of the Nitrogen Sufficiency Index (NSI 0.95) as an indicator for side dressing requirements. The experiment had a completely randomized block design with six treatments and four replications carried out in Red Latosol dystrophic soil (Hapludox), in Campo Mourão, Paraná State, where the following treatments in summer growth maize were applied: T1- 120 kg ha-1 N in seeding; T2- 120 kg ha-1 N in side dressing; T3- 40 kg ha-1 N in seeding and 80 kg ha-1 N in side dressing; T4- 30 kg ha-1 N in seeding and 90 kg ha-1 N in side dressing, monitored by a chlorophyll meter using the Nitrogen Sufficiency Index (NSI); T5- 120 kg ha-1 N anticipated in wheat seeding; T6- without nitrogen fertilization. NSI was determined by the relationship between the leaf chlorophyll index (ICF) average of T4 plants and that one in the plot fertilized with 120 kg ha-1 N at the maize seed sowing (T1). During two years, ammonium sulphate was applied to the maize crop after wheat under no tillage system. In the first year, with adequate rainfall, the maize yield was similar to the one in which the complete ammonium sulphate dose application was done in maize seeding and side dressing. The anticipated fertilization to wheat seed sowing resulted in maize yield without difference from the parceled form. In the second year, with irregular rainfall, all treatments with N were similar and they increased maize yield compared to that without N fertilization. NSI of 0.95 was not efficient to evaluate maize N requirements in side dressing, and resulted in lower maize yield. N was accumulated mainly in the grains unlike S that accumulated in the plant shoots; both were highly correlated to maize productivity.

【 授权许可】

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