Abstract
ABSTRACT Evaluation of fertilizers is an important premise, given the need for knowing new alternative sources to increase the efficiency in the use of nutrients, especially phosphorus. The objective of this study was to evaluate the growth of millet cultivated in sandy soil under phosphorus doses and sources. The experiment was carried out in a greenhouse, in Sobral, CE, in soil with low phosphorus concentration in the randomized block experimental design, with two sources (monoammonium phosphate - MAP and organomineral fertilizer prepared with MAP and organic compost of waste from small ruminant production - OMF) and four doses of P2O5 (35, 70, 140 and 210 kg ha-1), plus an additional treatment without phosphate fertilization, with three replicates, conducted in the second half of 2015. The variables measured were dry mass production, phosphorus accumulation in the plant and agronomic, physiological and recovery efficiencies. Evaluations were carried out in two cuts in millet plants(65 and 110 days after germination). The data were subjected to analysis of variance, followed by t-test for the sources and regression analysis for the doses, in addition to the Dunnett’s test to compare the phosphate fertilization with the control. In the first cut, it was observed that even at low doses of P2O5 (35 kg ha-1of P2O5), the biomass increases compared to the control. Increment in phosphorus doses increased the accumulation of this nutrient in millet plants. Considering the total accumulated in the two cuts of millet, the organomineral fertilizer promoted higher nutrient content compared to monoammonium phosphate from 127 kg ha-1 of P2O5.
Highlights
IntroductionSeveral studies report that the use of organic composts or even wastes from agricultural or agro-industrial activities can partly meet the P requirement of agricultural crops (Borges et al, 2019)
Phosphorus (P) deficiency is recognized in Brazilian soils in general, and in the semiarid region, P is an element that has limiting concentrations (Menezes et al, 2012).Several studies report that the use of organic composts or even wastes from agricultural or agro-industrial activities can partly meet the P requirement of agricultural crops (Borges et al, 2019)
Joint application of mineral and organic fertilizers is based on the synergy between these two types, since the organic fertilizer, even at small doses, through the release of organic acids, could reduce P fixation and increase its availability in the soil (Fernandes et al, 2015)
Summary
Several studies report that the use of organic composts or even wastes from agricultural or agro-industrial activities can partly meet the P requirement of agricultural crops (Borges et al, 2019). The combined use of mineral fertilizers with wastes or by-products can enhance or increase P use efficiency (Teixeira et al, 2014; Sá et al, 2017). It is important to consider that there may be a difference of response for organomineral fertilizer according to the organic matrix employed (Corrêa et al, 2016; Frazão et al, 2019). Some studies using animal production wastes applied to agricultural crops have shown increments in soil fertility (Nunes et al, 2015; Souza et al, 2016)
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