Organic acid coated-slow-release phosphorus fertilizers improve P availability and maize growth in a tropical soil

Abstract

In this paper, we report the results of studies on the solubility (water solubility trial) and the response by plants (greenhouse pot experiment using Zea mays) for four types of monoammonium phosphate fertilizers (Conventional MAP -MAP 1 , MAP coated with a natural organic acid -MAP 2 , MAP coated with a synthetic organic acid -MAP 3 , and MAP coated with a peat humic organic acid -MAP 4 ) applied at five increasing doses (0, 100, 300, 600 and 1200 mg P dm -3 ) and pre-incubated with the soil for five lengths of time before planting (0, 15, 30 and 60 d). The coating with organic acids reduced the water solubility of the P fertilizers -MAP 4 provided a more gradual release of P over time. In the soil pot experiment, it was found that MAP 1 required the highest dose to reach 90% of dry matter accumulation by the maize plant, followed by the Coated-Slow-Release Fertilizers (CSRF). The agronomic efficiency (AE) of P applied as the CSRF was 3 to 13% greater than that of MAP 1 . In addition, MAP 4 led to higher values of AE (+11%) and apparent P recovery by maize (+41%) in comparison to MAP 1 . The physicochemical properties imposed by the chemical composition of the organic acid coatings generated fertilizers with distinct release rates and improved agronomic efficiencies.

Short-Term Application of Polymer-Coated Mono-Ammonium Phosphate in a Calcareous Soil Affects the Pools of Available Phosphorus and the Growth of Hypericum × moserianum (L.)

“…Coating, allowing a release of P that follows flow and diffusion mechanisms, induces a slow P release (Shaviv and Mikkelsen, 1993;Du et al, 2006), as found in our study when coated and uncoated MAP were compared. The gradual P solubilisation from PCMAP can provide a more constant P supply toward the soil where roots are developing thus enabling greater efficiency as also reported by other authors (Pauly et al, 2002;Sanders et al, 2012;Teixeira et al, 2016). In fact, the higher the coating, the lower the P availability Olsen,water) and the higher the plant LGC, DW, and P uptake were.…”

“…Considering the treatment, it is noteworthy that SSP and PCMAP showed a lower P release in water than MAP, as evidenced by the clustering of the soil plots at the initial and final section of the segmented-line. Uncoated fertilizers, in fact, had high rate of P release and led to a fast increase of the P concentration in the soil solution (Silva et al, 2012;Teixeira et al, 2016). The slower P release of the coated fertilizer might be a result of physical and chemical barriers, whereas issues such as porosity, thickness and coating layer composition determine the P diffusion from the granule to the soil (Shavit et al, 1997;Du et al, 2006).…”

“…For instance, in the case of MAP, P was shown to be more slowly released from a thin polymer-coated fertilizer granule, and P availability, P uptake and P use efficiency were reported to increase in barley and rice (Pauly et al, 2002;Fageria et al, 2014). More recently, Teixeira et al (2016) studied different types of granular MAP coated with organic acids in a greenhouse pot experiment, and observed some differences in release rate and agronomic efficiency. By contrast, Silva et al (2012) found no differences in the dry matter of maize plants treated with different doses of P using either MAP coated or uncoated.…”

Energy use efficiency in soybean crops in different regions of Brazil

“…Considering this impact of fertilizers on the total energy used in the production of soybean, one way to reduce energy expenditure during production is to increase the efficiency of crop nutrient use. The increased efficiency of P and K fertilizer used (Teixeira, Silva, Sousa, Mattiello, & Soares, 2016), and of green fertilizers that promote nutrient cycling (Silva, Oliveira, Merloti, & Sá, 2017), and rooting promotion via co-inoculation with Bradyrhizobium and Azospirillum (Ferri, Braccini, Anghinoni, & Pereira, 2017) are examples of techniques that have been indicated to increase the efficiency of P and K use by soybean and thereby to increase EE. However, in terms of energy, one should be careful if opting to replace synthetic fertilizers by other sources of these elements.…”

The Controlled-release Phosphorus Fertilizer with Silica from Rice Husk

“…However, the disadvantages of organic fertilizers were low stability and low nutrient, it could be beneficial when used in an appropriate amount. New technologies to improve fertilizer quality and protect the environments are being developed by such methods as encapsulating the fertilizer by graphene (Zhang et al, 2014), coating them with inorganic materials (Tian et al, 2017;Teixeira et al, 2016;Wu et al, 2008) and/or adsorping them into Zeolite or Silica (SiO2) (Notario del Pino et al, 1995;Cui et al, 2015). These would make controlled-release fertilizer.…”