scholarly journals Influence of phosphorus fertilizers of various composition on the yield of tomato crops and control of their consumption by plants

2021 ◽  
Vol 937 (2) ◽  
pp. 022131
Author(s):  
N Bagnavets ◽  
A Zhevnerov ◽  
M Grigoryeva ◽  
T Pshenichkina
Keyword(s):  
Phosphoric Acid ◽  
Ammonium Phosphate ◽  
Greenhouse Experiment ◽  
Phosphate Fertilizers ◽  
Tomato Crop ◽  
Magnesium Ammonium Phosphate ◽  
Phosphate Ions ◽  
Magnesium Ammonium ◽  
And Control

Abstract Phosphate fertilizers are widely used for growing crops. To obtain phosphoric fertilizers, phosphoric acid purified using organic solvents, one of which is 100% tributyl phosphate, is used. The authors of the paper have chosen this solvent to obtain purified phosphoric acid. Purification from impurities included the stages of extraction and reextraction. On the basis of the re-extract and chemically pure phosphoric acid, a phosphoric fertilizer magnesium-ammonium phosphate (MgNH4PO4) was synthesized and used in the greenhouse experiment. The greenhouse experiment consisted in growing a tomato crop included three options for fertilization. A comparative analysis of the stimulating effect of magnesium-ammonium phosphate, synthesized with the use of phosphoric acid of varying degrees of purification, on the yield of tomato culture has been carried out.The paper proposes a blister-colorimetric version of the determination of phosphate ions in a blister cell containing a mixture of dry reagents in the form of a bulk. The optimal conditions for carrying out colorimetry have been selected. The proposed method makes it possible to semi-quantitatively determine phosphorus in various objects without preparing reagent solutions, using a bulk packed in an ampoule or blister, and can be used to control phosphorus consumption by plants, which, in turn, allows regulating the introduction of nutrients in the form of dressings.

Evaluation of phosphate fertilizers. III. Immediate and residual values of potassium metaphosphate and magnesium ammonium phosphate for potatoes, radishes, barley and ryegrass

1971 ◽  
Vol 76 (1) ◽  
pp. 131-141 ◽  
Author(s):  
G. E. G. Mattingly ◽  
A. Penny ◽  
Marie Blakemore
Keyword(s):  
Acid Soils ◽  
Ammonium Phosphate ◽  
Residual Effects ◽  
Triple Superphosphate ◽  
Final Test ◽  
Phosphate Fertilizers ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
Residual Values ◽  
Soluble P

SUMMARYTriple superphosphate (21.6% P), potassium metaphosphate (25.0% P) and magnesium ammonium phosphate (19.0% P) were compared as phosphate fertilizers alone and in combination, and as powders and granules, in two experiments on acid soils. Basal nutrients were adjusted to allow for the amounts of N, K, and Mg in the test fertilizers. Immediate effects of the fertilizers were measured by early potatoes and barley, and residual effects by radishes and ryegrass.All powdered fertilizers, alone or in combination, were equivalent to powdered superphosphate for early potatoes. The value of granular fertilizers for potatoes increased with the proportion of superphosphate in the mixtures. Superphosphate equivalents of the granular fertilizers were: magnesium ammonium phosphate, 14%; potassium metaphosphate + magnesium ammonium phosphate, 36%; potassium metaphosphate, 53%; superphosphate + potassium metaphosphate + magnesium ammonium phosphate, 54%; superphosphate + magnesium ammonium phosphate, 60%; superphosphate + potassium metaphosphate, 81%.Residues from powdered fertilizers, applied to potatoes, were equivalent, for radishes, to residues from powdered superphosphate. Residues from granular fertilizers were more effective for radishes than residues from powders.All powdered fertilizers were equivalent to powdered superphosphate for barley cut green. Granular magnesium ammonium phosphate, either alone or mixed with potassium metaphosphate, was slightly less effective than powder.Residues from all powdered fertilizers applied to barley were equivalent for ryegrass. Residues from granular fertilizers, especially potassium metaphosphate and magnesium ammonium phosphate, produced more grass than residues from powders.Apparent recoveries of P by the four crops ranged from 24% to 32% and were more from granules than from powders. Residues from all fertilizers increased 0.5M-NaHCO3-soluble P in soils, and mean yields of ryegrass, the final test crop, increased by 3.2 to 5.1 cwt dry matter/acre/ppm NaHCO3-soluble P in the soils.

AOAC Methods for the Determination of Phosphorus in Fertilizers

1964 ◽  
Vol 47 (3) ◽  
pp. 420-428
Author(s):  
W M Hoffman
Keyword(s):  
Ammonium Phosphate ◽  
Ammonium Molybdate ◽  
Volumetric Method ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium ◽  
Molybdate Method

Abstract The official volumetric method is less suitable than other official methods for the determination of phosphorus in fertilizer and should be deleted. Because rapid and accurate gravimetric quinoline molybdate and photometric vanadomolybdate methods are available, the little-used official gravimetric magnesium ammonium phosphate method also should be deleted. Volumetric Ammonium Molybdate Method

Determination of Magnesium, Total Phosphorus, and Free Phosphate in Rubber Latex

1956 ◽  
Vol 29 (2) ◽  
pp. 664-671 ◽  
Author(s):  
M. E. Tunnicliffe
Keyword(s):  
Total Phosphorus ◽  
Critical Evaluation ◽  
Ammonium Phosphate ◽  
Magnesium Nitrate ◽  
Rubber Latex ◽  
Magnesium Ammonium Phosphate ◽  
Molybdenum Blue ◽  
Magnesium Ammonium ◽  
Cationic Exchange

Abstract A critical evaluation of the molybdenum-blue method for the determination of orthophosphate and magnesium has been made and the conditions have been established for their quantitative determination in rubber latex. The precipitation of magnesium ammonium phosphate has been shown to be complete under the conditions of the test. For the conversion of phosphate to molybdenum blue, a comparison of several recommended reducing agents has shown that ferrous sulfate gives a stable and reproducible color which varies with the phosphate concentration according to Beer's Law. For the determination of total phosphorus, dry ashing of the sample with magnesium nitrate is proposed, followed by hydrolysis and a determination of the phosphate in the ash as molybdenum blue, as for magnesium. Free phosphate in latex serum is determined directly after coagulation and removal of interfering substances from the serum by cationic exchange.

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