Liquid limestone in the acidity correction of a Dystric Cambisol for Brachiaria production in Humaitá, Amazonas.

Klisman De Almeida Do Nascimento,Milton César Costa Camposita,José Maurício Da Cunha,Elilson Gomes De Brito Filho,Wildson Benedito Mendes Brito,Vânia Silva Fraga,Douglas Marcelo Pinheiro Da Silva,Flávio Pereira De Oliveira,Luís Antônio Coutrim Dos Santos

doi:10.33448/rsd-v9i8.5517

Abstract

Conventional solid limestone most commonly used in agriculture generally has disadvantages in handling, in addition to a certain infeasibility for small producers when compared to the use of liquid limestone with high purity and reactivity. Therefore, a better understanding of the dynamics of liquid limestone employed in soil acidity correction is important. Thus, this work proposes the use of liquid limestone to correct the acidity of a Dystric Cambisol in pasture cultivation in Humaitá, AM. An experiment was carried out in a greenhouse, where plastic pots were prepared for sowing Brachiaria brizantha, in a randomized block design with five treatments and four replications (T1 = witness, T2 = 2.5 L, T3 = 5 L, T4 = 10 L and T5 with common limestone). After 90 days of planting, the shoot and root size of both fresh and dry mass of each treatment were evaluated, as well as the number of tillers. The tillering of B. brizantha was highly responsive to the addition of liquid and common limestone, so that the higher the dose, the greater the results. In contrast, the treatments for fresh and dry shoot and root biomass production did not differ significantly between themselves, explaining why the product is still not well accepted and used by dealers and farmers.

Highlights

In order to minimize these problems, it has been proposed to use calcium carbonatebased fluid fertilizers to be sprayed into the soil to provide Ca2+ and possibly correct soil acidity
One treatment consisted of limestone application to increase base saturation to 50%, which is the most common management for soil acidity correction; the other treatments correspond to different doses of liquid fertilizer, which make up one ton of limestone
This behavior was adjusted to a 90% correlation quadratic regression curve (r = 0.907; p < 0.05), showing that the best dose for B. brizantha fresh aerial part mass (FAPM) increment is between 5 and 5.5 L ha-1 of liquid CaCO3

Summary

Introduction

In order to minimize these problems, it has been proposed to use calcium carbonatebased fluid fertilizers to be sprayed into the soil to provide Ca2+ and possibly correct soil acidity These products have high purity and reactivity (100%), as they consist of nanoparticles (0.5 – 0.8 microns), and have a ECCE of 140. They improve the dispersion of particles when applied to the soil and prevent dust emissions, reducing losses Another important factor is the ease of transportation of this product, which occupies less volume compared to limestone, making it possible for small and large farmers to use it, even in regions with difficulties in purchasing, as for example in Amazonian regions, where transportation is a limiting factor. The sources and preparation processes of these liquid fertilizers allow greater flexibility compared to solids and, according to Bittencourt and Beauclair (1992), there is easier handling, uniformity of soil application, elimination of storage problems and lower operating costs

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