For the whole record period
soil pollution from total DDT is practically at one and the same level, but it
exceeds the maximum admitted concentration 2 to 5 times.
The accumulation of HCCH
isomers (hexachlorcyclohexan) in soil occurs in less degree due to the well
dissolubility of this preparation in water and removing of it by back wash
waters from agricultural fields. Weighted average compound of it for the whole
record period had not been exceeded 0,3 of the maximum admitted concentration.
The increasing of MgCl content in soil is mainly occured in autumn
during cotton defoliation. The exceeded MgCl content in comparison with the acceptable
standards is occured more than 80 % of the investigated agricultural lands.
Soil pollution
from herbicides such as dalapon, cotoran, trefman exceeding normal acceptable
standard is extremely rare occured, and the such preparations as metafos, phosalone,
tiodan, occur in soil in the form of traces due to its instability in dry
climate. The high content of heavy metals, as a rule is marked in soils around of
such the industrial developed cities, as Tashkent, Almalic, Becabad, Chirchic.
Soil pollution from
arsenic and zinc with excess of the acceptable standards 10 and 6 times respectively in
Samarkand region had fixed.
Local soil pollution
from toxic chemicals in the areas near to the former agriculture spray plane
airfield storage and pesticides deposts is causes the special alarm.
At the same time, the
agriculture cannot develop without application of organic and mineral fertilizers and
chemical control. In this context, it is necessary to establish only an sure rate
corresponding with geografical conditions of the republic.
The last years the ways
to solve problem for utulization of old pestisides were founded.