Nutrient uptake by glauconit-phosphorite rock material
1998
Petkova, D. | Donov, D. | Stojchev, D. | Angelov, G. | Rajchev, T. | Stojcheva, D. (Institut po Pochvoznanie i Agroekologiya "N. Pushkarov", Sofia (Bulgaria))
Pot experiments were carried out during 1991-1995 with a glauconite-phosphorate materials and alfalfa as a test plant in an attempt to asses the properties of the used glauconite-phosphorate as a substrate for growing agrocultural plants. The amount of the biomass and the total content of N, K, Na, Ca, Mg, Cu, Zn, Mn, Fe in plants were analyzed. The results show that alfalfa plants can grow on the glauconite-phosphorate substrate without any addition of mineral fertilizers. The alfalfa plants accumulate during the experiment 2.5 - 3.3% phosphorous, 8.5 -9.2% potassium, 2.2 - 3.2% calcium, 2.7 -3.7% magnesium, 3.2 - 4.0% sodium calculated on the base of total amount of the these elements in the substrate. The plants cover its needs for nitrogen through symbiotic fixation.
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