Scientific Papers Series A. Agronomy

Table 2. Treatment efficiency in the two years of
experimenting
Variant First crop
Second crop
N
(average per ppm ppm % ppm
o
pH pH %
repetitions) P AL K AL N P AL K AL N
1 V1
(R1-R4)
7.78 58.20 170 0.15 7.68 47.95 186 0.18
2 V2
(R1-R4)
7.75 57.68 144 0.14 7.81 39.34 141 0.15
3 V3
(R1-R4)
7.80 43.67 120 0.14 7.74 41.83 199.2 0.18
4 V4
(R1-R4)
7.74 44.71 152 0.15 7.80 41.22 143.8 0.16
5 V5
(R1-R4)
7.72 47.42 142 0.13 7.80 39.96 152.6 0.14
6 V6
(R1-R4)
7.82 45.80 160 0.15 7.80 43.67 158.4 0.12
7 V7
(R1-R4)
7.52 70.61 188 0.15 7.82 31.35 116.2 0.12
8 V8
(R1-R4)
7.74 47.42 140 0.15 7.77 46.72 165.6 0.15
9 V9
(R1-R4)
7.77 49.04 168 0.15 7.75 42.45 187.4 0.18
The application of KH (potassium humate) in
two doses (150 l/ha) also resulted in the
increase of the mobile potassium contents in
the soil as compared to the non-fertilized
control, i.e. 187.40 mg/kg as compared to
186 mg/kg. By the application of one dose
(100 l/ha) of AH-I, the total nitrogen in the soil
dropped to 0.15% as compared to 0.18% in the
non-fertilized control. The application of a
double dose of AH-I (150 l/ha) did not change
the total nitrogen contents in the soil. In the
application of the treatment in the recultivation
of the slag heap, one dose (100 l/ha) of AH-U
reduced the total nitrogen contents in the soil to
0.16% as compared to 0.18% in the nonfertilized
control. The increase of the AH-U
liquid fertilizer dose resulted in the drop of the
total nitrogen contents in the soil to 0.14% as
compared to 0.18% in the non-fertilized
control. The liquid fertilizer AH-N applied in
one dose and two doses reduced the contents of
total nitrogen in the soil to 0.12% as compared
to 0.18% in the non-fertilized control.
Potassium humate (KH) applied in one dose
reduced the total nitrogen contents un the soil
to 0.5% as compared to 0.18% in the nonfertilized
control. By the application of a
double dose of potassium humate the total
nitrogen contents in the soil did not change.
CONCLUSIONS
By the application of treatments with humatebased
liquid fertilizers in the recultivation of
the Balta Unchiaului slag heap we noticed as
follows:
- the treatments performed with the liquid
fertilizer AH-N in two doses (150 l/ha)
resulted in the increase of the mobile
phosphorus contents in the soil to 70.61
mg/kg as compared to the contents of 58.20
mg/kg in the first year of the experiment;
- in the case of the mobile potassium, the
application of the liquid fertilizers resulted
in increase, by application of AH-I in two
doses (150 l/ha), to 199.20 mg/ha as
compared to 186 mg/kg in the non-fertilized
control. The application of the new liquid
fertilizer AH-U 150 l/ha resulted in the
increase of the mobile potassium in the soil
to 188 mg/kg as compared to 170 mg/kg in
the non-fertilized control, in the second year
of the experiment;
- the use of the new liquid fertilizers AH-I,
AH-N and AH-U in the two years of
experiments on the corn crop of the slag
heap had positive effects on the soil by the
increase of its nutrient contents.
ACKNOWLEDGEMENTS
The experiment was conducted with the
financial support of the Sectorial Operational
Programme for the Development of Human
Resources 2007-2013 Contract Code
POSDRU/107/1.5/S/76888 and of the National
Research and Development Institute for Soil
Science, Agro-Chemistry and Environment –
ICPA Bucharest.
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