Abstract
The use of organic waste in agriculture has been used aiming at greater productivity, decrease in the cost of production and sustainable use of resources. The present study aimed at evaluating the effect of phosphate fertilization with the maintenance of organomineral fertilizers, combining poultry manure and soluble or reactive phosphate, in the production of grains in corn culture and the residual effect for subsequent crops of beans and soybeans. The experiment was conducted in Sete Lagoas, MG, in 2015, using three fertilizers with sources of different phosphorus sources (triple super phosphate—STP, organomineral with STP and organomineral with Bayovar phosphate) applied at the doses of 65, 130, 195 and 260 kg·ha¯1 of P2O5 total, and compared to the control without phosphate fertilization. We evaluated the contents of foliar P, P accumulation in the grains, yields of corn grains, beans and soy, accumulated productivity and export of accumulated P of the three cultures. The three cultures assessed presented higher productivity when compared to the average of the factorial treatments that received phosphate fertilization relative to the control. Organomineral fertilizers increased grain production, obtaining average productivity equal to or greater than those obtained with the exclusive use of STP.
Highlights
Aiming at a sustainable agriculture, it is becoming increasingly necessary to use systems capable of providing greater productivity, and coupled with the efficiency in the supply of nutrients [1]
The present study aimed at evaluating the effect of phosphate fertilization with the maintenance of organomineral fertilizers, combining poultry manure and soluble or reactive phosphate, in the production of grains in corn culture and the residual effect for subsequent crops of beans and soybeans
The low impact of phosphate fertilization on corn on foliar P levels in this study reveals that the history of fertility management can have great influence on potential short-term response to new applications in clay soils of the Cerrado region
Summary
Aiming at a sustainable agriculture, it is becoming increasingly necessary to use systems capable of providing greater productivity, and coupled with the efficiency in the supply of nutrients [1]. The productivity of grain in Brazil is limited by high production costs, fertilizers being the more expensive inputs [2] [3]. The recycling of nutrients contained in organic matters accessible to the farmer is an alternative to the application of conventional fertilizers of high cost, in addition to minimizing the chance of pollution by incorrect waste disposal generated in agricultural activities [4]. The Brazilian production of broilers in 2015 was 13 million tons [5], generating large amount of waste such as the poultry manure. The main destination of these materials is the agricultural use “in natura”, which normally occurs without technical criteria that allow efficient use, resulting in large losses of nutrients [6]
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