The effect of 2 levels of K and P applications on an Italian Vertisol was investigated, adding known quantities of KCl and Na2HPO4 solutions, respectively. The extractions were carried out using electro-ultrafiltration (EUF) at different temperatures and compared with the NH4OAc extracted K and Olsen-P values. It was found that both the soluble K fraction, extracted by moderate EUF conditions, and the reserve K fraction, extracted by stronger EUF conditions, did not increase significantly with fertilization treatments. In the case of P the first moderate extraction assessed the different "fertilization' levels better
Effects of fertilizer additions on P and K availability inan Italian Vertisol as determined by electroultrafiltration
BUFO, Sabino Aurelio;
1990-01-01
Abstract
The effect of 2 levels of K and P applications on an Italian Vertisol was investigated, adding known quantities of KCl and Na2HPO4 solutions, respectively. The extractions were carried out using electro-ultrafiltration (EUF) at different temperatures and compared with the NH4OAc extracted K and Olsen-P values. It was found that both the soluble K fraction, extracted by moderate EUF conditions, and the reserve K fraction, extracted by stronger EUF conditions, did not increase significantly with fertilization treatments. In the case of P the first moderate extraction assessed the different "fertilization' levels betterFile in questo prodotto:
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