Impact of anthropogenic factors on the change of limed soil
2008
Koncius, D., Lithuanian Inst. of Agriculture, Klaipeda reg. (Lithuania). Vezaiciai Branch
Field and laboratory trials were carried out in the Vezaiciai Branch of the Lithuanian Institute of Agriculture in 1977-2005. The soil of the trial site was the Bathihypogleyi- Dystric Albeluvisol (ABd-gld), texture - morain loam. To evaluate the effect of various combinations of liming and fertilization on the change of soil chemical properties was the aim of this investigation. The planned pH levels (factor A) - pH less than 4.7 (no limed); 4.7-5.2; 5.2-5.7; 5.7-6.2; 6.2-6.7 and larger than 6.7 were established by primary liming with pulverized limestone in 1976. Pulverized limestone (92.55 % CaCO3) rates were as follows: 1.9; 3.3; 5.8; 14.7 and 49.6 t haE-1 respectively. The object of the investigations was naturally acid soil and the same soil exposed to a long term (more than 29 years) anthropogenic load. The essential and lasting (r = 0.8-0.9) variation of morain loam soil pHKCl under different anthropogenic load were established. The acidification process had a negative effect on the soil chemical properties. The highest variation of the topsoil pHKCl index to its diminishing (from 6.7 to 4.0) was obtained in the soil annually fertilized with a N135P117K171 rate of mineral fertilizers. It was revealed that the soil acidification process under the effect of intensive mineral fertilization (in both backgrounds with and without manure) was more intensive than in the no fertilized soil. Systematic long-term manure application had a positive effect on the soil chemical state: decreased the soil acidification process and suspended the increase of mobile aluminium amounts.
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