An investigation into the absence of sulphur and phosphorus responses in the dryland lucerne at Ashley Dene : a dissertation submitted in partial fulfilment of the requirements for the degree of Bachelor of Agricultural Science (Honours) in the University of Canterbury [Lincoln College]
Authors
Date
1977
Type
Dissertation
Fields of Research
Abstract
In recent years, attention has been focussed on the
efficient use of fertilisers in New Zealand. Superphosphate
has become an expensive farm item as a result
of continuing demand and higher production costs.
In terms of the correct supply of nutrients
required by pasture species, the use of superphosphate
has been inefficient on many soils. This has been indicated
by recent fertiliser trials in New Zealand as reported
by During (1972). The continual application of superphosphate
to many soils has increased their level of
plant available phosphorus (p) to the extent that superphosphate
could possibly be withheld for several years,
provided sulphur (S) requirements are met. The efficient
use of S and P fertilisers therefore demands a sound knowledge
of the S and P status of the soils and the pasture
requirements.
The key to improvement of shallow stony soils in
Canterbury has been the introduction of lucerne. This has
been associated with the continual application of superphosphate
for several years, resulting in a build up of the
S and P status of these soils. However, little is known
of the residual effect of these continued applications of
superphosphate on the available S and P pools.
The present study attempts to achieve this objective
in a dryland lucerne situation on an Eyre soil. The effects
of different rates of S and P on plant parameters were
recorded and related to the levels of S and P fractions in the soil.
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