Name
Bondareva Tatiana Nikolaevna
Scholastic degree
•
Academic rank
—
Honorary rank
—
Organization, job position
Kuban State Agrarian University
Web site url
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Articles count: 14
The contents of lead in soils are primarily determined by regional factors: the composition of parent rocks, relief, climate, vegetation. In recent years, these factors have increased the anthropogenic source of element. In order to assess its impact, requires knowledge of the natural, i.e., background lead levels, the so-called reference points, which can later be used to monitor changes occurring in the soil. Under background refers to the content of the element in soils at a great distance from the areas of receipt of contamination. Background content of lead in each type of soil depends mainly on composition of parent rocks. The correlation coefficient between the content of lead in parent rocks and soils, with the background contents is equal to 0,86±0,17 at p=0,95. For each soil type there are low variations in lead content due to the composition of parent rocks. Lead concentrations in the soils increased at the expense of its receipt from the atmosphere, irrigation water, drainage during mining, as a result of agricultural use, lead containing chemicals. Comparing the obtained results with existing currently permissible concentrations (APC, MPC) it is necessary to note that the lead content in leached chernozem soil after three rotations of the rotation may not cause any pathological changes or anomalies in the course of biological processes and lead to accumulation in the agricultural plants, and therefore may interfere with biological optimum
The article presents results of studying total content
of titanium in both not fertilized and systematically
fertilized black leached soil. Science-based system of
fertilizer crop rotation allows solving problems of
sufficient balance of nutrients in the system of "soilplant-fertilizer",
increasing the quantity and
improving the quality of the crop. At the same time,
their application is active influence on the natural
environment. In the soil, there is an input of a large
set of chemical elements come along with fertilizers.
In addition, due to their physiological pH or
alkalinity, fertilizers are capable to affect the physical
and chemical properties of the soil. The use of
mineral fertilizers in scientifically based doses on the
fields of crop rotation for 33 years virtually has no
impact on the content of titanium in leached
Chernozem. In the arable layer its number increased
only by 2.1 %, and in subsurface - it is the same as in
the crop without fertilizer. Enrichment of topsoil with
titanium is due to desilication of rocks during
weathering. Due to the low solubility of titanium
minerals, they remain in the place longer, and
therefore, the content of the element in the soil
increases. As you know, fertilizers applied to the
fields of crop rotation, increase the intensity of the
biological cycle of substances and thereby enhance
the process of destruction of the parent rocks
Over the past 15 years due to removal with crops of
rice crop rotation, as well as with field waste and
seepage water content of mobile forms of boron in
soils of rice irrigation systems in the Krasnodar region
decreased by 10 %, cobalt by 14 %, manganese
by 10 %, copper by 7 %, molybdenum by 15 % zinc
by 6 %. Impoverishment of soil with calcium and
sulfur is observable. Need of using micronutrients for
this crop is also determined by lowering mobility of
most microelements in flooded soils. Partly this problem
can be solved by use of neutralized phosphogypsum
– waste product of wet-process phosphoric acid.
With its application in dose of 1 t/ha, field receives
265 kg of Ca, 215 kg of S (general) 20 kg of P2O5
and 9.8 kg of SiO2, so it compensates for the loss of
calcium from the rice soil, as well as solves the problem
of sulfur, silicon and partly phosphorus fertilizers.
Data showing possibility of use of neutralized
phosphogypsum as multicomponent fertilizer for rice
crops are given. Phosphogypsum reduces sparseness
of rice plants in ontogeny, thus forming a dense agrocenosis:
plant density is 24-25 pcs./m2 that is higher
than on application of N120P80K60. Plants with such
agricultural background by their height and leaf area
did not differ from control ones (N120P80K60), and
their dry weight was higher by 2-6 %. With fertilizer
system N120P80K60 application of 4 t/ha of phosphogypsum
during main fertilizer treatment provides
the same level of phosphorus content in the soil and
plants, as application of 100 kg/ha of ammophos.
Rice yield increases by 0,57 t/ha or 8,98 %. Yield
growth is the result of increasing survival capacity of
plants, seed setting of panicle and weight of grain per
plant
The article shows a possibility of using neutralized
phosphogypsum as multicomponent fertilizer for rice
crops. In the system of rice fertilization replace of
150kg/ha of ammophos during main application with
40 kg/ha of carbamide and 4 tons/ha of phosphogypsum
applied in spring provides the same content of
available forms of nitrogen, phosphorus and potassium
in soil and plants as with application of
N120P80K60. Application of phosphogypsum in spring
before sowing is less effective than application in
autumn before plowing. When applicating phosphogypsum
in spring 2013 with a rate of 4 t / ha the
obtained yield was 0.57 t / ha or 8.98% higher than in
the control, and in 2014 it was not different from that
obtained with the application of solid mineral fertilizers
with a rate of N120P80K60. With autumn application
of phosphogypsum increase in yield in 2014 was
0.98 t / ha or 12.6%. Yield growth is the result of
increasing the survival of plants, grain content in
panicle and grain weight per plant. Use of neutralized
phosphogypsum is economically feasible. Relative
benefits of using phosphogypsum instead of phosphorus
fertilizer (ammonium phosphate) on rice
crops in the Federal State Unitary Enterprise SRSF
"Krasnoarmeyskiy" named after A.I.Maystrenko,
Krasnoarmeyskiy district of Krasnodar region at the
optimal rate amounted to 13139.7 rubles per 1 ha