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| Titel |
Impact of orchard and tillage management practices on soil leaching of atrazine, potassium, magnesium, manganese, iron, ammonium, nitrates and phosphates |
| VerfasserIn |
L. Szajdak, J. Lipiec, A. Siczek, U. Kotowska, A. Nosalewicz |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250020588
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| Zusammenfassung |
| The experiments were carried out on an Orthic Luvisol developed from loess, over limestone,
at the experimental field of Lublin Agricultural University in Felin (51o15’N, 22o35’E),
Poland.
The investigation deals with the problems of leaching’s rate of atrazine
(2-chloro-4-ethylamino-6-isopropylamino-1,2,3-triazine), potassium, magnesium,
manganese, iron, ammonium, nitrates and phosphates from two management systems of soil:
(i) conventionally tilled field with main tillage operations including stubble cultivator (10 cm)
+ harrowing followed by mouldboard ploughing to 20 cm depth, and crop rotation including
selected cereals, root crops and papillionaceous crops, (ii) 35-year-old apple orchard field
(100x200m) with a permanent sward that was mown in the inter-rows during the growing
season. The conventionally tilled plot was under the current management practice
for approximately 30 years. Field sites were close to each other (about 150 m).
Core samples of 100 cm3 volume and 5 cm diameter were taken from two depths
0-10 cm and 10-20 cm, and were used to determine the soil water characteristic
curve.
It was observed that management practices impacted on the physic-chemical properties of
soils. pH (in H2O) in tilled soil ranged from 5.80 to 5.91. However soil of orchard soil
revealed higher values of pH than tilled soil and ranged from 6.36 to 6.40. The content of
organic carbon for tilled soil ranged from 1.13 to 1.17%, but in orchard soil from 1.59 to
1.77%. Tillled soil showed broader range of bulk density 1.38-1.62 mg m-3, than orchard
soil 1.33-134 mg m-3.
The first-order kinetic reaction model was fitted to the experimental atrazine, potassium,
magnesium, manganese, iron, nitrates, ammonium and phosphates leaching vs. time data. The
concentrations of leached chemical compounds revealed linear curves. The correlation
coefficients ranged from -0.873 to -0.993. The first-order reaction constants measured for the
orchard soils were from 3.8 to 19 times higher than calculated in tilled soils. Half time of
studied substances in tilled soils ranged from 2.55 to 8.71 h, but in orchard soils these
parameters were significantly lower and ranged from 0.22 to 0.49 h. It seems that
managements practices significantly influences on the rates of leaching for all investigated
compounds. |
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