ECONOMIC ANALYSIS OF MAIZE GROWN UNDER INCREASING NITROGEN DOSES IN SUCCESSION TO INTERCROPPED PASTURES

Daniel Augusto Barreta,Flávio José Simioni,Luiz Alberto Nottar,Dilmar Baretta

doi:10.18512/rbms2020v19e1137

Daniel Augusto Barreta, Flávio José Simioni + Show 2 more

Open Access

https://doi.org/10.18512/rbms2020v19e1137

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Abstract

The aim of this work was to carry out an economic analysis of production systems with the use of cold season pastures followed by maize cultivation with surface application of increasing doses of nitrogen fertilizer. The treatments were: black oat + 200 kg of N ha-1 (Bo+N); black oat + white clover (Bo+Wc); black oat + vetch (Bo+Ve); black oat + red clover (Bo+Rc); and black oat + forage peanut (Bo+Fp). Experimental randomized block design was used, with four replications. The forage species were evaluated as to dry matter production, chemical-bromatological composition, estimated milk production (kg ha-1) and gross income (R$ ha-1). Maize was cultivated in succession, with doses of 0, 100 and 200 kg of N ha-1, in a split-plot design. Among the profitability indices evaluated, the gross margin (R$ ha-1) stands outs. The data were submitted to analysis of variance and the means were compared through Tukey's test at 5% probability. In the pasture phase, the Bo+N treatment presented higher gross income. In the cropping phase, the gross margin was higher in the Bo+Ve treatment, but it did not differ from the Bo+N treatment. In terms of system, the best economic result was obtained with the Bo+N treatment.

Highlights

Resumo - O objetivo deste trabalho foi realizar uma análise econômica de sistemas de produção com o uso de pastagens de estação fria seguido do cultivo de milho com doses crescentes de adubação nitrogenada em cobertura
Within this scope, selecting the forage species that is most suitable for the production system is a multidisciplinary task, since milk production and profitability are responses that vary as a function of the nutritive value and yield of the forage species (Doce et al, 2015)
In systems where cold season forage species are replaced with agricultural crops in the summer, the latter can be regarded as cover crops, since they prepare the seedbed for implementation of the crop

Summary

Introduction

Resumo - O objetivo deste trabalho foi realizar uma análise econômica de sistemas de produção com o uso de pastagens de estação fria seguido do cultivo de milho com doses crescentes de adubação nitrogenada em cobertura. With regard to the economic feasibility of pasture-based dairy farming, these systems are more flexible in relation to those with high supplementation and can be more or less intensified depending on the market’s economic condition This happens because livestock feeding is the most important variable for the operating costs of dairy farming (Silva et al, 2008). When the aim is to increase the production of milk, the way to do that is definitely by increasing forage production, since high forage yield is required in order to maintain the economic viability of the system (Elgersma & Søegaard, 2018) In this case, one of the strategies to increase forage production is the use of nitrogen fertilizers. It is worth noting that those results are obtained with the sole use of grasses (Avena strigosa Schreb and Lolium multiflorum Lam.) in the pasture phase and soybean (Glicine max) in the cropping phase

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