Identification and quantification of main anthropogenic stocks and flows of potassium in Brazil

Sipert, Samuel; Cohim, Eduardo; Nascimento, Francisco Ramon Alves do

doi:10.1007/s11356-020-09526-1

Cited by 23 publications

(12 citation statements)

References 51 publications

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“…In Brazil, the fourth largest importer of K fertilizer in the world (Anda, 2014), domestic production is limited to the Taquari-Vassouras mine/power plant complex, located in the state of Sergipe (sylvite mining), meeting only 6% of the national demand (Kulaif & Góes, 2016;Sipert et al, 2020). The main source of K fertilizer worldwide, potassium chloride, is mainly imported from the Northern Hemisphere and, therefore, is susceptible not only to international market prices but also to supply and exchange rate variations, making it a high-cost input (Ciceri et al, 2017;Dias et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Broadcast application of ground silicate rocks as potassium sources for grain crops

Crusciol

Soratto

Gilabel

et al. 2022

Pesq. agropec. bras.

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The objective of this work was to evaluate the agronomic and economic efficiency of phonolite rock (K2) and alkaline potassium-silicate rock (K3), ground and applied by surface broadcasting, as K sources for the soybean (Glycine max), corn (Zea mays), common bean (Phaseolus vulgaris), and upland rice (Oryza sativa) crops. Four experiments – one with each crop – were conducted in two crop years in a Typic Haplorthox in a randomized complete block design with four replicates. The treatments consisted of three sources (the KCl standard source, K2, and K3) and four rates (0, 0.5, 1.0, and 2.0 times the recommended for each crop) of K. The three sources increased similarly the leaf K concentration of soybean, corn, and common bean but had no effect on that of upland rice. The grain yield of all crops increased with the application of K2 and K3, as observed for KCl. The efficiency of the alternative K sources varies depending on the rate and crop. The K3 source is viable to be applied by broadcasting at the recommended K rate for all studied crops, while K2 is suitable only for soybean, corn, and common bean.

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Section: Introductionmentioning

confidence: 99%

Broadcast application of ground silicate rocks as potassium sources for grain crops

Crusciol

Soratto

Gilabel

et al. 2022

Pesq. agropec. bras.

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“…In combination with the rising value due to high demand from a growing global human population, this may cause geopolitical tension (Cordell and White 2015). Furthermore, some areas in the world are dependent on diminishing reserves of K (Bellarby et al 2018;Santos et al 2017;Sipert et al 2020) and in light of climatic extremes, Ks role in plant and soil functions, such as for the soil's water holding capacity and plant drought stress alleviation, might become more important. Other regions of the world have insufficient access to inorganic fertilizers, which limits production of crops and impairs food security (Van Ittersum et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Restoring nutrient circularity in a nutrient-saturated area in Germany requires systemic change

Wiel

Weijma

Middelaar

et al. 2021

Nutr Cycl Agroecosyst

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Regions with intensive agriculture often encounter environmental problems caused by nutrient excess of agro-food-waste systems that have become increasingly linear over previous decades. In this study, nitrogen (N), phosphorus (P), potassium (K) and carbon (C) flows in the whole agro-food-waste system of district Cleves in Germany were quantified simultaneously using substance flow analysis. Moreover, nutrient use inefficiency hotspots were identified to establish options to improve nutrient self-sufficiency as a first step towards nutrient circularity. Data on mass flows and nutrient contents was acquired for the year 2016 from stakeholders, statistical databases, literature and modelling. Organic C was included for flows with potential as organic fertilizer. Results show that animal production drives the nutrient flows in the export-oriented district, with feed import, manure application and losses from housing and manure storage accounting for 40, 45 and 60% of all N, P and K flows, respectively. In particular agriculture is responsible for N losses, with 150 kg N lost ha−1 agricultural land. Crop production surplus and with that soil accumulation of P and K are 515 t and 4100 t respectively. Stoichiometry of N:P:K:C in the different organic materials does not allow direct application and meeting crop requirements without exceeding demand of especially P. Processing of biomass is therefore required. Based on mass, especially manure holds potential for processing into bio-based fertilizers. To improve nutrient cycling and soil C conservation, being an important element for a sustainable agricultural sector, local balances between crop and animal production need to be considered.

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“…In agriculture, the main K fertilizer used is potassium chloride (KCl). In Brazil, the demand for K in the sector reached 4.1 Tg K in 2013, whereas its production was only of 0.280 Tg K, classifying the country as a major importer of KCl, with a trade value of US$3.3 billion, indicating a need to explore alternative K sources (Mancuso et al, 2014;Manning, 2018;Sipert et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Silicate rocks as an alternative potassium fertilizer for upland rice and common bean crops

Soratto

Crusciol

Campos

et al. 2021

Pesq. agropec. bras.

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The objective of this work was to evaluate the efficiency of molten and ground alkaline potassium-silicate rocks (K1) and of ground phonolite rock (K2) as sources of potassium for upland rice (Oryza sativa) and common bean (Phaseolus vulgaris) crops, in comparison with the traditional source (KCl). Two experiments - one with each crop - were conducted on a Typic Haplorthox in a randomized complete block design with four replicates. The treatments consisted of three sources (KCl, K1, and K2) and four rates (0, 20, 40, and 80 kg ha-1 K2O) of K. Regardless of the used source, K fertilization increased the leaf K content and grain yield of the upland rice and common bean crops. The agronomic efficiency index (AEI) of the alternative K sources varied according to the crop. For upland rice, the AEI of K2 was 8% higher than that of KCl at the recommended K rate, but similar at the highest rate. For common bean, the AEI values of K1 were close to that of KCl at the rates of 40 and 80 kg ha-1 K2O. The alternative sources K1 and K2 supply K and increase the grain yield of common bean and upland rice, respectively, similarly to KCl.

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Identification and quantification of main anthropogenic stocks and flows of potassium in Brazil

Cited by 23 publications

References 51 publications

Broadcast application of ground silicate rocks as potassium sources for grain crops

Broadcast application of ground silicate rocks as potassium sources for grain crops

Restoring nutrient circularity in a nutrient-saturated area in Germany requires systemic change

Silicate rocks as an alternative potassium fertilizer for upland rice and common bean crops

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