1,107 research outputs found
Pasture Manipulaton on animal, crop and pasture production
1. Effect of Pasture Manipulation on Animal Production - 81M01 - \u27Ranfurly\u27.
2. Effect of Pasture Manipulation on Crop Production - 81M01 - \u27Ranfurly\u27.
3. Effect of Pasture Manipulation on Animal Production - 82NA29 - \u27Culford\u27.
4. Pasture Manipulation in a 1:1 Rotation at Esperance - 79El5 – \u27Esperance Downs\u27.
5. Pasture Manipulation in a 2 pasture: 1 crop Rotation – 81E35 – \u27Esperance Downs\u27.
6. Pasture Manipulation - Effects on Take-all - 82LG25 - \u27McMahons\u27
Long term pasture manipulation trials
A.W.I.R.C Project 498/0029 Pasture manipulation on the Esperance sandplain. Introduction In 1981 a 2 pasture: 1 crop rotation trial incorporating four pasture manipulation treatments was commenced on the Esperance Sandplain to determine: 1. the effect of herbicide manipulation of pasture composition on pasture and animal production. 2. the effect of grass control on take-all levels in a following cereal crop. 3. the effect of grass control on desicantha weevil levels in a following cereal crop. Rotation trial for wheat comparing a pure clover ley with a mixed pasture ley on the Esperance sandplain - Esperance Down Research Station. The effect of chemical grass control in pastures on subsequent crop production and take-all levels - 82LG25
A Study of Compact Radio Sources in Nearby Face-on Spiral Galaxies. II. Multiwavelength Analyses of Sources in M51
We report the analysis of deep radio observations of the interacting galaxy
system M51 from the Very Large Array, with the goal of understanding the nature
of the population of compact radio sources in nearby spiral galaxies. We detect
107 compact radio sources, 64% of which have optical counterparts in a deep
H Hubble Space Telescope image. Thirteen of the radio sources have
X-ray counterparts from a {\em Chandra} observation of M51. We find that six of
the associated H sources are young supernova remnants with resolved
shells. Most of the SNRs exhibit steep radio continuum spectral indices
onsistent with synchrotron emission. We detect emission from the Type Ic SN
1994I nearly a decade after explosion: the emission (Jy
beam at 20 cm, Jy beam at 6cm,
) is consistent with light curve models for Type Ib/Ic
supernovae. We detect X-ray emission from the supernova, however no optical
counterpart is present. We report on the analysis of the Seyfert 2 nucleus in
this galaxy, including the evidence for bipolar outflows from the central black
hole.Comment: 22 pages, 8 figures (5 color) in separate files, AASTeX. Full
resolution figures and preprint may be obtained by contacting
[email protected]. AJ accepte
23 GHz VLBI Observations of SN 2008ax
We report on phase-referenced 23 GHz Very-Long-Baseline-Interferometry (VLBI)
observations of the type IIb supernova SN 2008ax, made with the Very Long
Baseline Array (VLBA) on 2 April 2008 (33 days after explosion). These
observations resulted in a marginal detection of the supernova. The total flux
density recovered from our VLBI image is 0.80.3 mJy (one standard
deviation). As it appears, the structure may be interpreted as either a
core-jet or a double source. However, the supernova structure could be somewhat
confused with a possible close by noise peak. In such a case, the recovered
flux density would decrease to 0.480.12 mJy, compatible with the flux
densities measured with the VLA at epochs close in time to our VLBI
observations. The lowest average expansion velocities derived from our
observations are km s (case of a double
source) and km s (taking the weaker source
component as a spurious, close by, noise peak, which is the more likely
interpretation). These velocities are 7.3 and 2 times higher, respectively,
than the maximum ejecta velocity inferred from optical-line observations.Comment: 4 pages, 3 figures. Accepted in A&A on 24/03/200
The Insect Situation in 1968
What happened last year will have some influence on insect conditions in 1968. The authors provice some suggestions on what to look for, and how to handle both crop and livestock insect problems
Insect and Rodent Prospects for 1962
What insects will we have this year? Insect problems depend a lot on weather conditions. Keeping this in mind and looking at the problems in 1961, here are the prospects for 1962 - and what to do about them
Insect Control in 1967
Advances in chemical control and farming procedures will let you win the battle agaisnt the bugs, but many questions concerning these measures need to be answered for you
Relationships Between the Nutrient Content of Irrigated Pasture on Offer and that Selected by Grazing Dairy Cows
An experiment was conducted to determine the dry matter, energy, crude protein and fibre intake by dairy cows in late lactation when grazing perennial pasture offered at allocations of 15, 20, 30 and 40 kg DM/cow.day. The cows consistently selected a diet 10% higher in digestibility than that on offer. In contrast, cows selected diets with crude protein levels increasing from 22% to 40%, above that in pasture on offer, as pasture allocation increased. A similar pattern was observed for the intake of white clover (Trifolium repens L). The increase in the concentration of crude protein in the diet (as allocation increased) was due to the consumption of white clover and a decrease in the consumption of the dead components of the sward. On the other hand, the neutral detergent fibre content of the diet selected was lower than that on offer, and declined as pasture allocation increased
Plant and Sward Characteristics to Achieve High Intake in Ruminants
Key points Intake is affected by complex interactions between signals from the digestive tract, intermediary metabolism and energy supply, and behavioural signals associated with learned behaviours or sensory signals. The ideal sward needs to have characteristics that are similar to total mixed rations to achieve high intake and animal performance. Genetic manipulation of plants may offer an accelerated rate of plant improvement, but benefits need to be demonstrated in a systems context
A Radio and X-Ray Study of Historical Supernovae in M83
We report the results of 15 years of radio observations of the six historical
supernovae (SNe) in M83 using the Very Large Array. We note the near linear
decline in radio emission from SN 1957D, a type II SN, which remains a
non-thermal radio emitter. The measured flux densities from SNe 1923A and 1950B
have flattened as they begin to fade below detectable limits, also type II SNe.
The luminosities for these three SNe are comparable with the radio luminosities
of other decades-old SNe at similar epochs. SNe 1945B, 1968L, and 1983N were
not detected in the most recent observations and these non-detections are
consistent with previous studies. We report the X-ray non-detections of all six
historical SNe using the Chandra X-ray Observatory, consistent with previous
X-ray searches of other decades-old SNe, and low inferred mass loss rates of
the progenitors.Comment: 3 color ps figure
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