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Effect of nitrogen phosphorus potassium fertilization and liming on the content and uptake of micronutrients by spring rape

Rebowska, Z.; Kusio, M.

Pamietnik Pulawski 86: 97-114

1985


ISSN/ISBN: 0552-9778
Accession: 005256973

The study involved the effect of three levels of NPK fertilization and three liming rates (equivalent to 0.5, 1.0, and 1.5 Hh) on the contents of B, Mn, Zn, Cu, and Mo in spring rape plants grown in a pot culture. The plants were sampled during their growth and at technical maturity. A no-lime treatment was used as the control. Both factors were found to influence strongly the mineral composition of the rape plants. The Mn, Zn, Cu, and Mo concentrations were affected more by liming than by NPK level. Liming equivalent to 0.5-1.5 Hh decreased the Mn, Zn and Cu contents and increased the Mo content. Neither of the two factors affected B content, the latter being related chiefly to growth stage of the plants. Liming and NPK fertilization were also found to have an effect on some macro- to micronutrient ratios in the rape plants. The N to Cu, P to Zn, and K to Mn ratios in seeds, leaves, and stalks and the Ca to B ratio in leaves and stalks were increased by liming. The effect of NPK fertilization was not consistent and was found to vary with fertilization rate and plant part. At a low NPK level and a low soil pH associated with a reduction in plant weight yield the above-mentioned ratios were markedly decreased. Regardless of the factors under investigation, the widest ratios were those of N to Cu and P to Zn in seeds, Ca to B in leaves, and K to Mn in stalks. The highest amounts of micronutrients were taken up by plants at the highest NPK level. Liming decreased the uptake of Mn, Zn, and Cu had increased the uptake of Mo. The highest uptake of B by rape was found at a liming rate equivalent to 1.0 Hh.

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