Phosphorus sources associated with organic compound in broccoli production and soil chemical attributes

Abstract

Phosphorus is a finite natural resource and the use of gradual-release phosphate sources, associated with an organic compound may favor a more rational use of this nutrient, since organic matter protects P from soil fixation. The aim of this study was to evaluate the effect of phosphorus sources application, associated with organic compound at planting, on single inflorescence type broccoli production and soil chemical properties at the end of the cycle. Eight treatments were evaluated, in a 4 x 2 factorial scheme, using four phosphorus sources [thermophosphate (TM), natural phosphate (NP), reactive natural phosphate (RNP) and triple superphosphate (TSP)]; in the presence (55 t ha-1) and absence of organic compound Visafértil® at planting. The experimental design was randomized blocks, with four replicates. TSP source presented higher P contents. TM source showed, in the absence of organic compound, higher pH and contents of organic matter, Ca, Mg, SB and V%. In the presence of organic compound, NP source provided higher contents of organic matter and K. The addition of organic compound increased pH and resulted in higher contents of P, K, Ca, SB, CEC and V%. The presence of organic compound favored higher productivity for the sources TM, NP and TSP. Among these sources, TSP provided the highest production both in the presence or absence of organic compound, considering that NP source was the only one which did not differ from TSP for inflorescence fresh weight and productivity, both in the presence and in the absence of organic compound. We concluded that TSP and NP are the best P sources, associated with the application of organic compound.

Fertilization recommendation for Brassica oleracea using Bulletin 100 is still valid after more than two decades

“…However, the combination of inorganic fertilizer at intermediate dose (30 kg ha -1 of N) with organic fertilizer had the same effect of high mineral N dose (60 kg ha -1 ). Also, Cardoso et al (2019) found a positive interaction when combining organic composts with mineral fertilizer, denoting their synergistic effect. In our work, the combination of organic PK and mineral N resulted in higher green mass than only organic source, but lower than only mineral sources.…”

“…Ouda and Mahadeen (2008) found that the application of organic manure at 80 or 60 t ha -1 increased soil organic matter content and that mineral fertilizer did not have an effect on organic matter content. Yet, Cardoso et al (2019) found that the application of organic compost in broccoli raised pH, in addition to increasing P, K and Ca contents. Chivenge et al (2011) in a meta-analysis to evaluate the effects of organic, mineral and combined N sources on maize, found that the residual soil organic carbon (SOC) was 17% and 12% higher when organic and combined organic and mineral sources were used, respectively, compared to the control (no fertilization).…”

Parsley production using organic sources of phosphorus

“…Phosphorus is of great importance in plant development, acting in photosynthesis, respiration, energy storage and transfer, cell division, among other processes, and its presence in adequate levels in the soil solution enhances the production of vegetables (Matos et al, 2016;Cardoso et al, 2019).…”

“…However, in areas of intensive cultivation of vegetables it is common to find high levels of P (Cecílio Filho et al, 2015) and even so to carry out fertilization with this nutrient. Since phosphorus is a natural and finite resource, excessive use is not sustainable and, therefore, studies on optimizing its use are necessary to achieve sustainable agriculture (Cardoso et al, 2019).…”