548 research outputs found
Red clover for silage: management impacts on protein content in the season after sowing
Red clover cultivar (Merviot vs. Ruttinova) impacted on annual yield while an earlier harvesting schedule improved herbage digestibility. In contrast, the application of inorganic N to red clover in spring resulted in no benefit. This paper reports the treatment effects on crop crude protein concentration
Red clover for silage: management impacts on ensilability indices in the second season after sowing
This experiment quantified the impacts of cultivar, companion grass, harvest schedule and N fertiliser on herbage ensilability at each of four harvests in the second year after sowing
Red clover for silage: management impacts on yield during the third year after sowing
Red clover is a perennial legume considered productive for a limited number of years. This experiment quantified the impacts of cultivar, companion grass, harvest schedule and nitrogen fertiliser on crop yield in the third year after reseeding, and compared these to grass receiving inorganic N fertiliser.
Herbage yield was increased in swards with red clover by including ryegrass in the seed mix, by not applying inorganic N fertiliser in mid-March and by adopting the early harvest schedule. Red clover cultivar did not affect annual yield
A Polynomial Spectral Calculus for Analysis of DG Spectral Element Methods
We introduce a polynomial spectral calculus that follows from the summation
by parts property of the Legendre-Gauss-Lobatto quadrature. We use the calculus
to simplify the analysis of two multidimensional discontinuous Galerkin
spectral element approximations
Leaf appearance of annual clovers responds to photoperiod atemergence
Leaf appearance rate and time to canopy expansion of four annual clover species (arrowleaf, balansa,gland and Persian) were quantified in field and controlled environment studies. Crops sown in autumn,which experienced shortening daylengths at emergence, had a slower rate of leaf production and con-sequently took a longer time to initiate branching, than spring-sown crops. When autumn-sown ‘Bolta’balansa clover emerged on the shortest day in winter (21 June), the rate of leaf appearance was lengthenedby 4◦C d/leaf/h. When the same species emerged after the shortest day, into an increasing photoperiod,the phyllochron was shortened by 5◦C d/leaf/h. This influence of photoperiod on the phyllochron conse-quently altered the time to axillary leaf production (branching). Throughout all sowing dates, phyllochronwas the fastest for ‘Prima’ gland (33–91◦C d/leaf) and slowest for ‘Cefalu’ arrowleaf (53–116◦C d/leaf)clovers. ‘Bolta’ balansa was 44–82◦C d/leaf and ‘Mihi’ Persian 61–93◦C d/leaf. The response of phyllochronto photoperiod suggests these annual clovers should be sown in late summer or early autumn to initiateaxillary leaf production as soon as possible to ensure maximize dry matter for early spring
Structure of Light Scalar Mesons from D_s and D^0 Non-Leptonic Decays
Non-leptonic D meson decays may provide a reliable testbed for the multiquark
interpretation of light scalar mesons. In this letter we consider D_s decay and
show that a 4-quark f_0(980) meson could induce a decay pattern, which is
forbidden for a q-qbar constituent structure. Experimental tests to probe such
possibilities are within reach in the near future.Comment: 11 pages, 3 figures, minor changes. To appear in Phys. Lett.
Precise Determination of Proton Spin-Precession Angles in the K600 Spectrometer and Beamline
This research was sponsored by the National Science Foundation Grant NSF PHY-931478
A Complete Set of In-plane Spin-transfer Coefficients for Small Angle pp Elastic Scattering at 200 MeV
This research was sponsored by the National Science Foundation Grant NSF PHY-931478
Positive Parity Scalar Mesons in the 1-2 GeV Mass Range
Based on the observation that K_0(1430) is lighter than its SU_3 counterpart,
a_0(1450), we examine the possibility that these particles, together with
f_0(1370), f_0(1500) and f_0(1710), fill a tetraquark recurrence of the sub-GeV
0^{++} nonet mixed with a glueball state. We find the picture to be consistent
with the known data about the three f_0 resonances, more than the q-qbar
hypothesis. Conventional spin-orbit coupling suggests the q-qbar, P-wave, nonet
to lie around 1200 MeV. We review possible experimental indications of a scalar
isovector resonance at 1.29 GeV, first observed by OBELIX in p-pbar
annihilation.Comment: 12 pages, 9 figures. Extended version. References added. Results and
conclusions unchange
Analysis of the nature of the and decays
We study interference patterns in the and reactions. Taking into account the interference, we fit the
experimental data and show that the background reaction does not distort the
spectrum in the decay everywhere over the
energy region and does not distort the spectrum in the decay
in the wide region of the system
invariant mass, MeV, or when the photon energy is less than
300 MeV. We discuss the details of the scalar meson production in the radiative
decays and note that there are reasonable arguments in favor of the one-loop
mechanism and . We
discuss also distinctions between the four-quark, molecular, and two-quark
models and argue that the Novosibirsk data give evidence in favor of the
four-quark nature of the scalar and mesons.Comment: 15 pages, 7 figures, title is changed, a few clarifying remarks are
added, accepted for publication in Physical Review
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