PREPARATION OF PHOSPHORIC FERTILIZER BASED ON PHYTOCOMPOSITION OF ZINC AND MONOCALCIUM PHOSPHATE

In this article the results of synthesis of monocalcium phosphate with a zinc phytocompound are considered. By studying the chemical interaction of monocalcium phosphate with a zinc phytocompound, studying their physicochemical and commercial properties, the optimal compositions of phosphorus fertilizers based on monocalcium phosphate with a zinc phytocompound have been determined. Considering the importance of phosphorus for the formation of plant tissue in increasing the productivity of agricultural crops, the main attention is paid to the assi-milation of phosphorus compounds by plants, which is of paramount importance. It is well known, that one of the main disadvantages of phosphorus fertilizers used in crop production is the low utilization rate of nutritive phosphorus pentoxide, which does not exceed 20-22%. The fact of the low utilization rate of nutritious phosphorus pentoxide in fertilizers is associated with its retrogradation in the soil with the formation of compounds not assimilated by plants. Agrochemical studies have established that phytocompounds increase the utilization rate of phosphorus-containing fertilizers.

RESEARCH OF PRODUCTION TECHNOLOGIES, MICROBIOLOGICAL AND AGROCHEMICAL CHARACTERISTICS OF FERTILIZERS BASED ON MONO-, DYCALCIUM PHOSPHATE WITH ZINC PHYTO-COMPOUND: Communication 2. Study of microbiological and agrochemical characteristics of a composition based on mono-, dicalcium phosphate with a phytocompound of zinc

On model soil samples, the positive effect of the composition based on mono-, dicalcium phosphates with a phytocompound of zinc on the number of soil microorganisms affecting the nitrogen and phosphorus nutrition of plants and the accumulation of easily hydrolyzable nitrogen and mobile forms of phosphorus pentoxide in the soil was established. Achieved: an increase in the number of nitrogen-fixing microorganisms in comparison with the standards in 3.14-3.2 times and phosphate-mobilizing 3.4-3.42 times; accumulation of soil 11.5-12.7% of easily hydrolyzable nitrogen and 6.9-8.1% of mobile forms of phosphorus pentoxide. In the reference variants, there is a decrease in the content of phosphorus pentoxide mobile forms by 6.9-8.3%, which is associated with the retrogradation of phosphorus pentoxide. A decrease in the number of oligotrophs and denitrifiers, decomposing humus, and nitrate nitrogen of the soil by 2.18-2.15 times and 2.5- 2.56 times is the basis for the preservation of soil fertility. Under the conditions of a microplot experiment, it was determined that the compositions containing a Phyto compound of zinc provide an increase in the yield of raw cotton in comparison with the standards – mono-, dicalcium phosphates 3.9 and 4.3 c/ha. The data obtained are in good agreement with phenological observations, the content of nutrients in the middle of the growing season, and the results of microbiological studies.

Petrographic Analysis of the Palaeocene-Eocene Phosphate-Bearing Rocks of Eastern Dahomey Basin, Southwestern Nigeria.

Phosphorus is ubiquitous for its essential function in plant growth. Phosphate-bearing rocks include phosphorites and rocks that host phosphate mineral. Phosphorites, rocks containing ≥18 % phosphorus-pentoxide (P2O5), are essential sources of phosphorus. Due to the vast application of phosphorites in the manufacture of fertilisers and industrial products, the study of phosphate bearing rocks is crucial. This article examines the mineral component and structure of phosphate-bearing rocks in the Eastern Dahomey Basin, Southwestern Nigeria. Eleven pulverised samples of phosphatic rocks were analysed, employing a microscope, for petrographic studies. Three major types of phosphorites exist in the Eastern Dahomey Basin: Granular (which are composed of oolitic and pelletal structures), Nodular (which comprises cylindrical, rectangular, ellipsoidal shapes), and the vesicular (which either have coarse or fine forms) varieties. The phosphorites contain fluorapatite (as the dominant mineral), calcite, quartz, and glauconite. Generally, the phosphorites are fossiliferous (lamellibranches, echinoderms, shell, and bone fragments are observable). The phosphatic limestones are micrite (allochems) hosting collophane (specks of fine-textured fluorapatite) and glauconite. While fluorapatite occurs in the phosphatic claystone, it is glauconitic, just as the gypsum. The results of the petrographic analysis indicated the influence of seawater in the deposition of the phosphate-bearing rocks in an oxic environment.

Synthesis of benzofurans from the cyclodehydration of α-phenoxy ketones mediated by Eaton’s reagent

Cyclodehydration of α-phenoxy ketones promoted by Eaton’s reagent (phosphorus pentoxide–methanesulfonic acid) is used to prepare 3-substituted or 2,3-disubstituted benzofurans with moderate to excellent yields under mild conditions. The method provides a facile access to benzofurans from readily available starting materials such as phenols and α-bromo ketones. The reaction is highly efficient, which is attributed to the good reactivity and fluidity of Eaton’s reagent. The reaction can be applied to prepare naphthofurans, furanocoumarins, benzothiophenes, and benzopyrans.

Gum arabic-OPO3H2 as a new natural-based green catalyst for the one-pot pseudo-four-component synthesis of naphtho[1,2-e][1,3]oxazines

Gum arabic-OPO3H2 (GA-OPO3H2) as a unique natural-based green catalyst was synthesized by the reaction of phosphorus pentoxide with gum arabic.