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 ϕ→γπη\phi\to\gamma\pi\eta and ϕ→γπ0π0\phi\to\gamma\pi^0\pi^0 decays

We study interference patterns in the $\phi\to(\gamma a_0+\pi^0\rho)\to\gamma\pi\eta$ and $\phi\to(\gamma f_0+\pi^0\rho)\to\gamma \pi^0\pi^0$ reactions. Taking into account the interference, we fit the experimental data and show that the background reaction does not distort the $\pi^0\eta$ spectrum in the decay $\phi\to\gamma\pi\eta$ everywhere over the energy region and does not distort the $\pi^0\pi^0$ spectrum in the decay $\phi\to\gamma\pi^0\pi^0$ in the wide region of the $\pi^0\pi^0$ system invariant mass, $m_{\pi\pi}>670$ 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 $\phi\to K^+K^-\to\gamma a_0$ and $\phi\to K^+K^-\to\gamma f_0$. 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 $a_0(980)$ and $f_0(980)$ mesons.Comment: 15 pages, 7 figures, title is changed, a few clarifying remarks are added, accepted for publication in Physical Review