177 research outputs found
Π€Π΅ΡΡΠΈΠ³Π°ΡΠΈΡ ΡΠΎΠΌΠ°ΡΠ° Π² ΠΎΡΠΊΡΡΡΠΎΠΌ Π³ΡΡΠ½ΡΠ΅
Obtaining high and stable yields of tomato with good consumer qualities in the open field has now become problematic due to the fact that hybrids and varieties of tomato of an intensive type place high demands on the presence of moisture and nutrients in the root-soil layer. The required level of soil moisture in combination with the introduction of calculated doses of mineral fertilizers during the growing season provides for obtaining the planned yields of vegetables, including tomato. The most important resource for the further development of agriculture in the Russian Federation is irrigated land. Volgograd region is one of the largest irrigated agricultural regions in Russia. Growing of almost all vegetables in the region is conducted on irrigated lands. The use of only one irrigation without the use of fertilizers will not have a positive impact on the growth, development and productivity of plants. Fertigation is the most effective and economical way of delivering nutrients to the plant root system and allows to get a higher yields than other methods of fertilizer application. In fertigation systems, the control of optimal concentrations of fertilizers is easily achieved, their ratio and these parameters can be controlled automatically. The purpose of this work was to study the comparative efficiency of ammonium nitrate, calcium nitrate and a combination of calcium nitrate and ammonium chloride for tomato fertigation in combination with non-root dressings of complex water-soluble fertilizers containing macroand microelements in open feild on irrigated lighchestnut soil of dry steppe zone of chestnut soils in the Volgograd region. As a result, analysis of the use of mineral fertilizers for tomato fertigation in light chestnut soils of the Volgograd region was carried out. The positive effect of foliar dressing with microelements in the proposed dosages has been proven.Π‘ΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΠ΅ ΡΠΎΡΡΠ° ΠΈ Π³ΠΈΠ±ΡΠΈΠ΄Ρ Π²ΠΎΠ·Π΄Π΅Π»ΡΠ²Π°Π΅ΠΌΡΠ΅ Π² ΠΎΡΠΊΡΡΡΠΎΠΌ Π³ΡΡΠ½ΡΠ΅ ΠΎΡΠ΅Π½Ρ ΡΡΠ΅Π±ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½Ρ ΠΊ Π½Π°Π»ΠΈΡΠΈΡ Π²Π»Π°Π³ΠΈ ΠΈ ΠΏΠΈΡΠ°ΡΠ΅Π»ΡΠ½ΡΡ
Π²Π΅ΡΠ΅ΡΡΠ² Π² ΠΏΠΎΡΠ²Π΅. ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΎ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΡΠ΅ΡΠ³Π΅ΡΠ°ΡΠΈΠΈ Π΄Π»Ρ ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ ΡΡΡΠΎΠΉΡΠΈΠ²ΠΎΡΡΠΈ ΡΠΎΠΌΠ°ΡΠΎΠ² Π½Π° ΠΎΡΠΎΡΠ°Π΅ΠΌΡΡ
Π·Π΅ΠΌΠ»ΡΡ
. ΠΠ·ΡΡΠ΅Π½Π° ΡΡΠ°Π²Π½ΠΈΡΠ΅Π»ΡΠ½Π°Ρ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ Π°ΠΌΠΌΠΈΠ°ΡΠ½ΠΎΠΉ ΡΠ΅Π»ΠΈΡΡΡ, ΠΊΠ°Π»ΡΡΠΈΠ΅Π²ΠΎΠΉ ΡΠ΅Π»ΠΈΡΡΡ (Π½ΠΈΡΡΠ°ΡΠ° ΠΊΠ°Π»ΡΡΠΈΡ) ΠΈ ΠΊΠΎΠΌΠ±ΠΈΠ½Π°ΡΠΈΠΈ ΠΊΠ°Π»ΡΡΠΈΠ΅Π²ΠΎΠΉ ΡΠ΅Π»ΠΈΡΡΡ ΠΈ Ρ
Π»ΠΎΡΠΈΠ΄Π° Π°ΠΌΠΌΠΎΠ½ΠΈΡ Π΄Π»Ρ ΡΠ΅ΡΡΠΈΠ³Π°ΡΠΈΠΈ ΡΠΎΠΌΠ°ΡΠ° Π² ΡΠΎΡΠ΅ΡΠ°Π½ΠΈΠΈ Ρ Π½Π΅ΠΊΠΎΡΠ½Π΅Π²ΡΠΌΠΈ ΠΏΠΎΠ΄ΠΊΠΎΡΠΌΠΊΠ°ΠΌΠΈ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΡΠΌΠΈ Π²ΠΎΠ΄ΠΎΡΠ°ΡΡΠ²ΠΎΡΠΈΠΌΡΠΌΠΈ ΡΠ΄ΠΎΠ±ΡΠ΅Π½ΠΈΡΠΌΠΈ, ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΠΌΠΈ ΠΌΠ°ΠΊΡΠΎΠΈ ΠΌΠΈΠΊΡΠΎΡΠ»Π΅ΠΌΠ΅Π½ΡΡ, Π² ΠΎΡΠΊΡΡΡΠΎΠΌ Π³ΡΡΠ½ΡΠ΅ Π½Π° ΠΎΡΠΎΡΠ°Π΅ΠΌΠΎΠΉ ΡΠ²Π΅ΡΠ»ΠΎ-ΠΊΠ°ΡΡΠ°Π½ΠΎΠ²ΠΎΠΉ ΠΏΠΎΡΠ²Π΅ ΡΡΡ
ΠΎΡΡΠ΅ΠΏΠ½ΠΎΠΉ Π·ΠΎΠ½Ρ ΠΊΠ°ΡΡΠ°Π½ΠΎΠ²ΡΡ
ΠΏΠΎΡΠ² ΠΠΎΠ»Π³ΠΎΠ³ΡΠ°Π΄ΡΠΊΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ. ΠΡΠΎΠ²Π΅Π΄Π΅Π½ Π°Π½Π°Π»ΠΈΠ· ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΡ ΠΌΠΈΠ½Π΅ΡΠ°Π»ΡΠ½ΡΡ
ΡΠ΄ΠΎΠ±ΡΠ΅Π½ΠΈΠΉ Π΄Π»Ρ ΡΠ΅ΡΡΠΈΠ³Π°ΡΠΈΠΈ ΡΠΎΠΌΠ°ΡΠ° Π² ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΡΠ²Π΅ΡΠ»ΠΎ-ΠΊΠ°ΡΡΠ°Π½ΠΎΠ²ΡΡ
ΠΏΠΎΡΠ² ΠΠΎΠ»Π³ΠΎΠ³ΡΠ°Π΄ΡΠΊΠΎΠΉ ΠΎΠ±Π»Π°ΡΡΠΈ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ ΠΏΠΎΠ»ΠΎΠΆΠΈΡΠ΅Π»ΡΠ½ΠΎΠ΅ Π²Π»ΠΈΡΠ½ΠΈΠ΅ Π»ΠΈΡΡΠΎΠ²ΡΡ
ΠΏΠΎΠ΄ΠΊΠΎΡΠΌΠΎΠΊ ΠΌΠΈΠΊΡΠΎΡΠ»Π΅ΠΌΠ΅Π½ΡΠ°ΠΌΠΈ Π² ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π½ΡΡ
Π΄ΠΎΠ·ΠΈΡΠΎΠ²ΠΊΠ°Ρ
Search for direct production of a2(1320) and f2(1270) mesons in e+e- annihilation
A search for direct production of C-even resonances a2(1320) and f2(1270) in
e+e- annihilation was performed with SND detector at VEPP-2M e+e- collider. The
upper limits of electronic widths of these mesons were obtained at 90%
confidence level:
Gamma(a2(1320) \to e+e-) < 0.56 eV,
Gamma(f2(1270) \to e+e-) < 0.11 eV.Comment: 6 pages, 5 figures, 1 table. Submitted to Phys. Lett.
The process in the energy range 2E_0=1.04 - 1.38 GeV
In the experiment with the SND detector at VEPP-2M e^+e^- collider the
process was studied in the energy range 2E_0 from
1.04 to 1.38 GeV. A broad peak was observed with the visible mass
MeV and cross section in the maximum
nb. The peak can be interpreted as a -like resonance .Comment: 10 pages LATEX and 5 figure
Experimental Study of rho -> pi0 pi0 gamma and omega -> pi0 pi0 gamma Decays
The e+e- -> pi0 pi0 gamma process was studied in the SND experiment at
VEPP-2M e+e- collider in the energy region 0.60-0.97 GeV. From the analysis of
the energy dependence of measured cross section the branching ratios B(omega ->
pi0 pi0 gamma)= (6.6 +1.4-0.8(stat) +-0.6(syst))x10^-5 and B(rho -> pi0 pi0
gamma)=(4.1 +1.0-0.9(stat) +-0.3(syst))x10^-5 were obtained.Comment: 16 pages, 7 figures, submitted to Phys. Lett.
New Data from SND Detector in Novosibirsk
The current status of experiments with SND detector at VEPP-2M e^+e^-
collider in the energy range 2E_0=400-1400 MeV and recent results of data
analysis for , and decays and e^+e^- annihilation into
hadrons are presented.Comment: 7 pages, 8 figures, Latex2e, uses espcrc1.sty. Talk given at 8th
International Conference on Hadron Spectroscopy (HADRON 99), Beijing, China,
24-28 Aug 199
Experimental study of the e+e- -> pi0 gamma process in the energy region sqrt(s)=0.60-0.97 GeV
Results of the study of the e+e-->pi0 gamma process with SND detector at
VEPP-2M collider in the c.m.s. energy range sqrt(s)=0.60-0.97 GeV are
presented. Using 36513 selected events corresponding to a total integrated
luminosity of 3.4 pb^-1 the e+e-->pi0 gamma cross section was measured. The
energy dependence of the cross section was analyzed in the framework of the
vector meson dominance model. The data are well described by a sum of
phi,omega,rho0->pi0 gamma decay contributions with measured decay
probabilities: Br(omega->pi0 gamma)=(9.34+-0.15+-0.31)% and Br(rho0->pi0
gamma)=(5.15+-1.16+-0.73)*10^-4 . The rho-omega relative interference phase is
phi(rho,omega}=(-10.2+-6.5+-2.5) degree
New precise determination of the \tau lepton mass at KEDR detector
The status of the experiment on the precise lepton mass measurement
running at the VEPP-4M collider with the KEDR detector is reported. The mass
value is evaluated from the cross section behaviour around the
production threshold. The preliminary result based on 6.7 pb of data is
MeV. Using 0.8 pb of data
collected at the peak the preliminary result is also obtained:
eV.Comment: 6 pages, 8 figures; The 9th International Workshop on Tau-Lepton
Physics, Tau0
Study of the radiative decay with CMD-2 detector
Using the of data collected with the CMD-2 detector at VEPP-2M
the decay mode , has been
studied. The obtained branching ratio is B(.Comment: 13 pages, 5 figures, LaTex2e, to be published in Phys. Lett.
Observation of semileptonic decays with CMD-2 detector
The decay has been observed by the CMD-2 detector at
the e^+e^- collider VEPP-2M at Novosibirsk. Of 6 million produced
pairs, events of the decay were selected. The
corresponding branching ratio is . This result is consistent with the evaluation of from the semileptonic rate and lifetime
assuming .Comment: 7 pages, 6 figures, LaTex2e. Submitted to Phys.Lett.
Measurement of omega meson parameters in pi^+pi^-pi^0 decay mode with CMD-2
About 11 200 e^+e^- -> omega -> pi^+pi^-pi^0 events selected in the center of
mass energy range from 760 to 810 MeV were used for the measurement of the
\omega meson parameters. The following results have been obtained: sigma
_{0}=(1457 \pm 23 \pm 19)nb, m_{\omega}=(782.71 \pm 0.07 \pm 0.04) MeV/c^{2},
\Gamma_{\omega}=(8.68 \pm 0.23 \pm 0.10) MeV,
\Gamma_{e^+e^-}\cdot Br (\omega -> pi^+pi^-pi^0)=
(0.528 \pm 0.012 \pm 0.007) \cdot 10^{-3} MeV.Comment: 8 pages, 4 figure
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