ISSN:
1573-0867
Schlagwort(e):
Boronia
;
Boronia megastigma Nees
;
flower production
;
nitrogen nutrition
;
nitrogen sources
;
nitrogen toxicity
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
Abstract Nitrogen was supplied from two fast release sources, ammonium sulfate ((NH4)2SO4) and calcium nitrate (Ca(NO3)2) and a slow release source, isobutylidene diurea (IBDU) to boronia, a new flower crop native to Australia. At lower rates (25 kg per ha), N availability from different sources, as indicated by the leaf N concentration, did not differ within a month after application but three months after application, N availability was higher from IBDU than from (NH4)2SO4 or Ca(NO3)2. At 50 or 100 kg per ha, N availability was higher throughout the year from (NH4)2SO4 or Ca(NO3)2 than from IBDU, thereby allowing luxury consumption and causing toxicity. The flower yield increased with increasing N rates. Complete doses of all N rates which were applied early during the vegetative growth gave the highest yields and the same N rates applied in split doses at different phases of plant growth decreased the yields. In addition, high N availability during flowering (caused by a split dose) further decreased the yield. At all application times, IBDU gave the highest yield and the differences in yields with (NH4)2SO4 and Ca(NO3)2 were not significant. The leaf N concentration associated with maximum yield declined as the plant advanced towards flowering.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01054458
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