Studies on the fertilizing effect of copper in the cultivation of some plants
1988
Bobrzecka, D. (Akademia Rolniczo-Techniczna, Olsztyn (Poland). Katedra Chemii Rolnej)
Some plants were cultivated in a crop-rotation system on brown and pseudopodsol soils and their responses to the direct and subsequent effects of copper fertilization, at the doses of 5, 10 and 20 kg/ha, were studied in 1978-87. It was found that soil fertilization with the dose of 10 kg Cu/ha had a significant, positive yield-forming effect in a 4-field crop-rotation, the best results being for sugar beet and horse bean. Fertilization increased the content of available copper in the soil. Optimal and toxic content of copper in the cultivated plants were determined basing on the yield-forming effect. Copper was also used to fertilize wheat before seedling and as foliar spray. Doses of 0.2-0.4 kg/ha applied during stem time were most effective when administered together with 50 kg N/ha in form of 10 percent urea solution, i.e. when the fertilizing components were at ratio of 4.0-8.0 Cu tot. per 1 kg of N. Copper and nitrogen appeared to be highly inter-related when used as foliar spray in wheat cultivation. It was found that the ratio N promille: Cu mg/kg d.wt. in the indicatory parts of the plants may be used to determine the demand for copper
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