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Joint International Conference on Long-term Experiments ...

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Table 1. Ca supply of 5 soil profiles measured by using different soluti<strong>on</strong>s<br />

for extracti<strong>on</strong><br />

Samples pH(KCl) CaCO3(%) AL-Ca EDTE-Ca KCl-Ca Exch. Ca H2O-Ca<br />

Cs1 7.27 3.2 16284 698 2992 515.0 25.30<br />

Cs2 7.31 15.0 58494 768 2636 497.2 25.70<br />

Cs3 7.55 26.0 98023 712 2030 392.2 20.90<br />

Cs4 7.54 22.0 90226 648 1661 350.2 20.80<br />

Cs5 7.84 12.0 47998 575 1076 334.0 20.10<br />

KR1 7.05 1.1 29539 852 3676 594.6 32.40<br />

KR2 7.20 6.2 51742 689 3136 570.6 16.10<br />

KR3 7.32 13.0 65102 587 2820 459.8 19.10<br />

KR4 7.30 12.0 7588 557 2400 379.8 23.00<br />

KMR1 4.92 0.0 4439 374 3408 436.8 8.57<br />

KMR2 5.03 0.0 4528 417 4037 496.8 5.20<br />

KMR3 5.59 0.0 4841 559 4175 524.0 2.74<br />

KMR4 6.38 0.1 4791 571 3495 361.4 1.68<br />

KMR5 6.91 4.9 19683 610 3590 389.0 3.35<br />

KH1 7.17 3.8 18902 726 2499 411.8 24.80<br />

KH2 8.10 18.0 72984 454 688 437.8 13.30<br />

KH3 8.39 12.0 43129 355 253 114.2 8.70<br />

KH4 8.37 10.1 31476 347 168 100.4 9.31<br />

KMH1 6.94 0.0 1436 389 483 60.4 7.03<br />

KMH2 7.11 0.0 588 329 302 50.8 3.30<br />

KMH3 7.07 0.0 591 324 185 53.4 3.23<br />

KMH4 7.49 0.0 464 280 197 35.2 2.58<br />

The measurements prove that the soluti<strong>on</strong>s used for extracti<strong>on</strong> produced highly variable data<br />

of Ca c<strong>on</strong>tent. Most quantities appeared in c<strong>on</strong>centrated acid extracts, in<strong>term</strong>ediate in<br />

extracts with neutral soluti<strong>on</strong>s, the less was extracted with watery soluti<strong>on</strong>s forming<br />

complexes. The results obtained could be also c<strong>on</strong>verted from <strong>on</strong>e method to the other.<br />

354

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