Density Of Stems
Mostrando 25-36 de 44 artigos, teses e dissertações.
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25. PROPRIEDADES MECÂNICAS DE SOLO FRANCO ARENOSO SOB DISTINTOS SISTEMAS DE PREPARO, TRÁFEGO MECANIZADO E RESÍDUOS VEGETAIS / MECHANICAL PROPERTIES OF A SANDY LOAM SOIL AFFECTED BY TILLAGE STEMS MECHANICAL TRAFFIC AND SURFACE MULCH
The excessive mobilization of the soil causes losses to its structure. This is eliminated with the no tillage system, where mobilization only occurs in the planting line. However, considering that lately there was an increase in the use of the agricultural soils and of the mechanization, compaction problem in the surface soil layer in the system of no tillag
Publicado em: 2005
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26. Performance of tomato cultivars (Lycopersicon esculentum Mill.) organically-grown under greenhouse conditions. / Desempenho de cultivares de tomate (Lycopersicon esculentum Mill.) sob sistemas orgânicos em cultivo protegido.
Organic agriculture in Brazil has increased about 30% over the last few years since consumers are seeking for healthier foods, i.e. nutritious and free of pesticide residues. Among vegetable crops organically-grown, tomato constitutes an attractive economic opportunity for growers. However, the lack of information about management practices and cultivars ada
Publicado em: 2005
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27. On the MHD boundary of Kelvin-Helmholtz stability diagram at large wavelengths
Working within the domain of inviscid incompressible MHD theory, we found that a tangential discontinuity (TD) separating two uniform regions of different density, velocity and magnetic field may be Kelvin-Helmholtz (KH) stable and yet a study of a transition between the same constant regions given by a continuous velocity profile shows the presence of the i
Brazilian Journal of Physics. Publicado em: 2004-12
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28. Rendimiento de plantas de tomate injertadas y efecto de la densidad de tallos en el sistema hidropónico
Tomato cultivated in spring at a low plant density and then increasing the effective plant density by means of allowing side shoots to develop, when daily light integrals are high, appears a promising way of increasing spring-season tomato crop fruit number per square meter and to produce fruits of more uniform size; and has the added advantage that fewer pl
Horticultura Brasileira. Publicado em: 2004-06
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29. Efeitos de densidades de Aeschynomene rudis Benth e seu controle com o herbicida Ethoxysulfuron em duas épocas de aplicação na cultura do arroz (Oryza sativa L.) irrigado. / Effects of Aeschynomene rudis Benth densities and its control with the herbicide ethoxysulfuron at two application timings in paddy rice (Oryza sativa L.).
During the season 2001/2002, an experiment was conducted in Taubaté city, area of the Paraíba-SP valley, to evaluate the effect of Aeschynomene rudis Benth. densities on paddy rice, and the efficacy of the herbicide ethoxysulfuron applied in early and mid post emergence. The rice variety Epagri 109 and A. rudis were planted October 30, 2001 in dry soil. Th
Publicado em: 2004
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30. Agronomic efficiency of nitrogen sources and fertilizers associations on deferment process of Brachiaria brizantha cv Marandu pastures. / Eficiência agronômica de fontes nitrogenadas e de associações de fertilizantes no processo de diferimento de Brachiaria brizantha cv Marandu.
The present research was conducted, from March through November 2003, to evaluate the efficiency of different nitrogen sources and fertilizers combinations on the deferment process of B. brizantha cv. Marandu upon forage production and applied nitrogen recovery along the growing, grazing and regrowth phases, besides the grazed forage nutritive value and the
Publicado em: 2004
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31. Modelling lucerne (Medicago sativa L.) crop response to light regimes in an agroforestry system
The general goal of this research was to understand the agronomic and physiological changes of a lucerne crop in distinct physical radiation environments and to verify the potential of lucerne to grow under shaded conditions. To achieve this, the research was conducted in four main steps: (i) firstly, experimental data collection in the field using two artif
Publicado em: 2002
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32. EFFECTS OF PHYSICAL AND BIOCHEMICAL CHARACTERISTICS OF CONTRASTING LEGUME SWARDS ON SELECTIVE BEHAVIOUR OF GRAZING CATTLE
In order to assess the effects of sward physical characteristics and secondary compound concentration on cattle ingestive behaviour and diet selection, two sets of experiments were carried out using two legumes [birdsfoot trefoil (Lotus corniculatus L.); red clover (Trifolium pratense L.)] with approximately neutral partial preference. The first set investig
Publicado em: 1998
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33. Organização e estrutura das comunidades vegetais de cerrado em um gradiente topografico no Brasil central
Several lines of evidence suggest that the variation in Cerrado physiognomy is determined and maintained by fire. The objective of this study was to determine and describe pattems indicating that after 19 yr of fire protection, the Cerrado vegetation developed to a high density and cover mature vegetation. The hypothesis of this study was that protected Cerr
Publicado em: 1993
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34. Alterations in structure, chemistry, and biodegradability of grass lignocellulose treated with the white rot fungi Ceriporiopsis subvermispora and Cyathus stercoreus.
The white rot fungi Ceriporiopsis subvermispora FP-90031-sp and Cyathus stercoreus ATCC 36910 were evaluated for their ability to delignify Bermuda grass (Cynodon dactylon) stems and improve biodegradability. Compositional and structural alterations in plant cell walls effected by the fungi were determined by nuclear magnetic resonance spectroscopy, gas chro
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35. Photomodulation of Axis Extension in Sparse Canopies 1: Role of the Stem in the Perception of Light-Quality Signals of Stand Density
A fiber optic probe inserted into plant tissues was used to investigate the effects of canopy density on the light environment in different organs. The red:far-red ratio inside the stem of Datura ferox L. seedlings and the estimated phytochrome photoequilibrium were strongly reduced by the presence of neighbors forming canopies too sparse to cause any mutual
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36. Magnetic resonance microscopy of changes in water content in stems of transpiring plants.
Differences in water content and degree of binding in the various stem tissues of Pelargonium hortorum were observed by magnetic resonance imaging. 1H images were obtained with a resolution of 100 microns in the transverse plane and a slice thickness of 1250 microns. It was possible to distinguish the principal tissues of the stem by differences in their pro