19 research outputs found
Produtividade de arroz irrigado e eficiênciade uso do nitrogênio influenciadas pela fertilização nitrogenada
Estimation of the Fertilizer Response of Maize and Bean Intercropping Using Sole Crop Response Equations
Maize (Zea mays L.) and bean (Phaseolus vulgaris L.) are commonly grown
in association in eastern and southern Africa. Results from 64
fertilizer response trials conducted in Kenya were used to study the
relationship between maize monoculture response to fertilizer nitrogen
and phosphorus and the intercrop response. The intercrop was more
productive that the monoculture with no fertilizer applied, but overall
responses of systems to applied nutrients did not differ. Maize, both
in monoculture and intercropped, responded more frequently to applied N
than did the intercropped bean. Frequency of response to applied P was
similar for both crops and both production systems. The basis was
established to estimate maize-bean intercrop fertilizer response using
response equations for maize monoculture.En Afrique de l'est et australe, le mais (Zea mays L.) et le haricot
(Phaseolus vulgaris L.) sont habituellement cultives en association.
Les resultats de 64 essais de reponse aux fertilisants conduits au
Kenya etaient utilises pour etudier le rapport entre les reponses de
l'azote et du phosphore au mais en monoculture et en culture mixte. La
culture mixte etait plus productive que la monoculture qui n'a pas renu
de fertilisants. Toutes les reponses des systemes qui ont renu les
fertilisants n'etaient pas differentes. Le mais, a la lois en
monoculture et en association, repondait plus a l'application d'azote
que le haricot en association. La frequence de reponses a l'application
du phosphore etait similaire pour toutes les 2 cultures et dans tous
les 2 systemes de production. La base etait ainsi etablie pour estimer
la reponse de fertilisants a la culture associee de mais - haricot en
utilisant les equations de reponse pour le mais en monoculture
Improvement of rice plant type concepts: systems research enables interaction of physiology and breeding
Characterization of the Organic Nitrogen Fraction Determined by the Illinois Soil Nitrogen Test
Physiological response of rice and weeds to low light intensity at different growth stages
Teores de nitrogênio no solo e nas frações da matéria orgânica sob diferentes sistemas de produção de milho
Observation of Resonance Structures in e+e- →π+π-ψ2 (3823) and Mass Measurement of ψ2 (3823)
© 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.Using a data sample corresponding to an integrated luminosity of 11.3 fb-1 collected at center-of-mass energies from 4.23 to 4.70 GeV with the BESIII detector, we measure the product of the e+e-→π+π-ψ2(3823) cross section and the branching fraction B[ψ2(3823)→γχc1]. For the first time, resonance structure is observed in the cross section line shape of e+e-→π+π-ψ2(3823) with significances exceeding 5σ. A fit to data with two coherent Breit-Wigner resonances modeling the s-dependent cross section yields M(R1)=4406.9±17.2±4.5 MeV/c2, Γ(R1)=128.1±37.2±2.3 MeV, and M(R2)=4647.9±8.6±0.8 MeV/c2, Γ(R2)=33.1±18.6±4.1 MeV. Though weakly disfavored by the data, a single resonance with M(R)=4417.5±26.2±3.5 MeV/c2, Γ(R)=245±48±13 MeV is also possible to interpret data. This observation deepens our understanding of the nature of the vector charmoniumlike states. The mass of the ψ2(3823) state is measured as (3823.12±0.43±0.13) MeV/c2, which is the most precise measurement to date
Measurement of proton electromagnetic form factors in the time-like region using initial state radiation at BESIII
The electromagnetic process is studied with the initial-state-radiation technique using 7.5 fb−1 of data collected by the BESIII experiment at seven energy points from 3.773 to 4.600 GeV. The Born cross section and the effective form factor of the proton are measured from the production threshold to 3.0 GeV/ using the invariant-mass spectrum. The ratio of electric and magnetic form factors of the proton is determined from the analysis of the proton-helicity angular distribution
Study of the processes χcJ → Ξ−Ξ¯+ and Ξ0Ξ¯0
Using 448.1 × 106 ψ(3686) decays collected with the BESIII detector at the BEPCII e+e− storage rings, the branching fractions and angular distributions of the decays χcJ → Ξ−Ξ¯¯¯¯+ and Ξ0Ξ¯¯¯¯0 (J = 0, 1, 2) are measured based on a partial-reconstruction technique. The decays χc1 → Ξ0Ξ¯¯¯¯0 and χc2 → Ξ0Ξ¯¯¯¯0 are observed for the first time with statistical significances of 7σ and 15σ, respectively. The results of this analysis are in good agreement with previous measurements and have significantly improved precision