As in recent years I sent off soil samples for
analysis in Late March 2003. The
reason for doing it at this particular time is for the application of lime (if required)
to be done six weeks before the application of pre-planting fertilizers.
As you may have already seen from my garden page, I have
four growing areas: two greenhouses and two garden areas (terraces). Terrace 2 is the most
recently constructed and has been separately analysed once (1998). From 1999 the two
terraces were combined into one sample for analysis, the results are therefore the same.
In 2003 the two greenhouse samples were also combined and therefore how
identical results for 2003 analysis.
From the results of soil analysis it is clear that
the soil nutrient characteristics in the greenhouses is different to the outdoor areas due to the absence of winter leaching: nitrogen and potash
levels should be higher in the greenhouses, which historically they have
been, but in 2003 they are very similar.
The following charts cover nitrogen, potash, phosphate and
pH levels. All growing areas are shown on each chart.
Once again, 2003 soil analysis service provided by Hortibotanic
UK , you can email Barry
Goss for more information.
The first chart shows the nitrogen content. This year we see
convergence of all growing areas towards a starting point around 25/30ppm. In 2001 the two greenhouse areas are showing
significantly higher nitrogen content than previous years. The 2002 and 2003
shows greenhouse results comparable with those pre 2001.
Very high potash levels initially in the first few years of chrysanthemum
cultivation, well above that advocated by Barrie Machin. It may be
coincidental, but in recent years I have experienced very little damping of blooms. Over the years no potash has been added and this is reflected in a gradual
reduction. 2003 analysis shows continuing reduction in all areas resulting
in the need for potash application in the base dressing this year and also
in the liquid feed formulation throughout the growing season.
All my growing areas tend to be low in phosphate. Regular application of bonemeal and
superphosphate has done little to raise the level towards the 50ppm target. In 1998
bonemeal was applied at the end of the growing season, in Spring 1999 a small amount
of superphosphate was added pre-planting and a liquid feed containing phosphate was used
in the early stages. Bonemeal was again added pre-planting in 2000.
In 2001 there is a significant jump in
possibly resulting from further superhosphate application. 2002 analysis
shows a return to pre 2001 levels suggesting 2001 results are
questionable. "003 results are similar in nature to those pre 2001
and some correction is necessary in both outdoor growing areas.
Arguably the key factor in the availability of the other nutritional elements. This
picture that shows a generally consistent (and welcome) movement towards the target value
of 7.0. 2002 results show ideal levels in greenhouse 1 and terrace but a
significant drop in greenhouse 2. 2003 results place all growing areas
above 6.5, almost ideal.
If you would like further information or
wish to comment on this publication please send your e-mail to: email@example.com
Last updated on 30 April, 2003