|
|
|
|
|
|
|
|
|
|
Home | Instructions to Authors |SASE| Editorial Board | Articles | Subscriptions | Conference | Conference Program |
|
|
|
|
|
|
|
|
|
Abstract DOI: 10.4029/2007jemrest3no119 A greenhouse study
was conducted during fall 2006 to determine the effects of phosphorus rate
and amendment of substrate with calcined clay on growth and quality of
container-grown ‘Freedom Red’ poinsettia (Euphorbia
pulcherrima Willd. ex Klotzsch ‘Freedom Red’). Three complete,
water soluble fertilizer solutions with varying rates of phosphorus (0.2 mM,
0.6 mM and 1.8 mM) were applied to containerized plants grown in a commercial
bark and peat based substrate with or without incorporation of 10% calcined
attapulgite-type clay. Pots were irrigated each time their weight dropped to
45% of container capacity. Leachate was collected from each container after
each irrigation event using the pour-through method. Leachate samples were
analyzed to determine electrical conductivity and pH. Plant growth data were
collected at crop finish. Results suggest that 0.6 mM phosphorus is adequate
to achieve market quality finished plants and that higher rates result in
reduced efficiency of phosphorus uptake and, with open irrigation systems,
are likely to result in discharge of higher phosphorus loads into
groundwater. |
|
Copyright ©
2002-2009 |