Effect of the alternated intensity nitrogenous fertilization on quality in seminatural grassland, 2: Mineral content
1994
Jancovic, J. (Vysoka Skola Polnohospodarska, Nitra (Slovak Republic). Katedra Krmovinarstva)
In semi-natural grassland, botanically characterized as Lolio-Cynosuretum typicum association, the effects of both gradual and alternative nitrogen rates, changing with PK-fertilization in the 1st and in the last year of the trial, on the concentrations of mineral elements (phosphorus, potassium, calcium, magnesium, sodium), balance of nutrients and utilization of nutrients were investigated. The content of mineral elements in dry matter was (at the identical nitrogen (N) amount) higher under the periodic alternation of both PK and NPK-fertilizer. Utilization of N, which was applied yearly, decreased with increasing rates of N from 64.2 % at 60 kg.ha** (-1) to 39.5 % at 240 kg.N.ha** (-1) applied, N-utilization increased to 57.9-76.2 %. In case of periodical interchange of PK-fertilization with NPK, N utilization reached 74.4-100.4 %. Both P and K utilizations are higher when higher N-rates are applied. At the same amout of N, better utilization P and K is also reached, provided N-dosage is applied for 2 years and is alternating with other 2 years of PK-fertilization.
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