New Zealand Journal of Crop and Horticultural Science abstracts
Yield and quality of malting barley (Hordeum vulgare L. `Valetta')
in response to irrigation and nitrogen fertilisation
J. M. DE RUITER
New Zealand Institute for Crop & Food Research Limited
Canterbury Agricultural Science Centre
Private Bag 4704
Christchurch, New Zealand
email: deruiterj@crop.cri.nz
Abstract Interactions of soil water and nitrogen (N)
fertiliser application on the quality of barley (
Hordeum vulgare L.
`Valetta') for malting were studied in a rain shelter experiment at Lincoln,
New Zealand. Treatments were arranged in a factorial design, consisting of five
levels of soil water (fully irrigated, rain-fed, early drought, late drought,
and full drought) and four levels of N fertiliser (nil, 1 x 50, 2 x 50,
and 3 x 50 kg N/ha). N treatments were applied at emergence,
appearance of the second node, and at flowering, respectively. Variables
indicative of grain quality (N concentration, grain size, and screenings) and
micro-malting characters (water uptake, malting loss, N index, wort-N,
[[beta]]-glucan, fine extract, coarse extract, and fine-coarse difference) were
evaluated for responses to the water and N treatments. Drought influenced the
distribution pattern of kernel mass along the main stem and tiller spikes and
also influenced the relative proportions of grain in the standard size
categories. The level of N fertiliser had little effect on the kernel size
properties. Screenings originated from both the proximal and distal ends of
tiller spikes and from the proximal end of the main stem spike. The less
severely water stressed treatments had fewer small kernels and mean weight of
kernels was greater over all kernel positions. Grain N concentration responded
to N fertiliser application but was unresponsive to water treatment. The
reverse was true for kernel size and the malting characters of water uptake,
malting loss, extract levels, and fine/coarse difference. Drought increased the
levels of wort [[beta]]-glucan and lowered wort N and N index whereas N
fertiliser caused an increase in wort [[beta]]-glucan and wort N but lowered
the N index. Interactions between water and N effects were only significant for
the latter. Both the timing of drought and fertiliser treatment had strong
effects on the biochemical and physical characteristics of grain.
Keywords extract; [[beta]]-glucan; grain size;
Hordeum vulgare L.; water use; wort N
H99011
Received 4 March 1999; accepted 15 October 1999
PDF file of entire paper: medium quality (940K); (scanned from paper original: notes about this process)
This year's abstracts |
Journal home page |
All abstracts |
Publishing home page
