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NUTRIENT UPTAKE DYNAMICS AND DRY MATTER ACCUMULATION IN HEMP IN RELATION TO NITROGEN FERTILIZATION
Zvjezdana Augustinovic
orcid.org/0000-0002-1823-4986
; Visoko gospodarsko učilište Križevci, Križevci, Hrvatska
Milan Pospišil
; Agronomski fakultet Svučilišta u Zagrebu, Zagreb, Hrvatska
Jasminka Butorac
; Agronomski fakultet Svučilišta u Zagrebu, Zagreb, Hrvatska
Marija Vukobratovic
; Visoko gospodarsko učilište Križevci, Križevci, Hrvatska
Tomislava Peremin-Volf
; Visoko gospodarsko učilište Križevci, Križevci, Hrvatska
Ivan Katana
; Visoko gospodarsko učilište Križevci, Križevci, Hrvatska
Sažetak
Two-years field trials (2004 and 2005), carried out on Križevci College of Agriculture experimental field sites, aimed at determining the effect of fertilization with increasing nitrogen quantities (0, 60, 120, 180 kg N/ha) on hemp dry matter accumulation and nitrogen, phosphorus and potassium uptake dynamics. Plant material for analyses was taken four times during the growing season (20, 40, 60 and 80 days after emergence). With increasing nitrogen quantities from 0 to 180 kg/ha accumulation of dry matter was increasing but statistically significant only in 2005 in initial vegetation stages (20 and 40 days after emergence). The most intensive accumulation of dry matter was between 40th and 60th day after emergence. In both years nitrogen content in plant dry matter was significantly increased with increasing amounts of nitrogen fertilizer only in the first two samplings 20 and 40 days after emergence, whereas after this period, nitrogen fertilizer quantity had no significant effect on the nitrogen content in plant dry matter. Maximum absorption of nitrogen was between 20 and 40 days after emergence. Nitrogen fertilization in early stages of vegetation resulted in a decrease of phosphorus share in dry matter and at the later stages of vegetation in an increase absorption of phosphorus. The most intensive absorption of phosphorus was between 20 and 40 days after emergence. Nitrogen fertilization had no effect on the absorption of potassium, and the largest proportion of potassium in plant dry matter was determined 40 days after emergence.
Ključne riječi
hemp; nitrogen fertilization; dry matter; nitrogen; phosphorus; potassium uptake
Hrčak ID:
85686
URI
Datum izdavanja:
15.7.2012.
Posjeta: 1.607 *