Influence of nitrogen fertilization and green manure on the economic feasibility of no-tilled wheat in the Cerrado

Revista Ceres

Douglas De Castilho Gitti²  Orivaldo Arf¹  Mariana Melero¹  Ricardo Antonio Ferreira Rodrigues¹  Maria Aparecida Anselmo Tarsitano¹ 

[1] ,Universidade Estadual Paulista Faculdade de Engenharia de Ilha Solteira Departamento de Fitotecnia, Tecnologia de Alimentos e Sócio EconomiaIlha Solteira São Paulo ,Brazil

关键词: Triticum aestivum L.;    production cost;    Crotalaria juncea L.;    pigeonpea;    millet;    residual effect;    Triticum aestivum L.;    custo de produção;    Crotalaria juncea L.;    guandu;    milheto;    efeito residual;   

DOI  :  10.1590/S0034-737X2012000200014

来源: SciELO

【 摘 要 】

The search for higher profitability in wheat crop with cost reduction technologies that may promote sustainability is an important matter in Brazilian agriculture. This study evaluated the profitability of no-tilled wheat, reducing nitrogen topdressing doses with the cultivation of green manure before the wheat crop. The experiment was carried out in Selvíria (MS), Brazil, in 2009/10. The experiment was arranged in a randomized block design with 36 treatments in splitplots and four replicates. The plots were formed by six types of green manure: Cajanus cajan L. BRS Mandarin, Crotalaria juncea L., Pennisetum americanum L. BRS 1501, fallow area and mixed cropping of Pennisetum americanum L. + Cajanus cajan L. and Pennisetum americanum L. + crotalaria which provided straw for no-tilled wheat in the winter, following the rice crop in the summer. The subplots were formed by six levels of topdressing nitrogen (0, 25, 50, 75, 100 and 125 kg N ha-1) using urea as a nitrogen source. The wheat grown after green manure in the previous winter crop, with no nitrogen topdressing and a rate of 25 kg ha-1 N, had more frequently production costs above the gross income. Wheat production cost after the mixed cropping Pennisetum americanum L. + Cajanus cajan L. and Pennisetum americanum L. + Crotalaria juncea L. from the previous winter crop, combined with nitrogen rates of 50 and 75 kg N ha-1, provided better profitability compared with the other green manures evaluated.

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