Photosynthetically Active
Mostrando 13-24 de 129 artigos, teses e dissertações.
-
13. Microclimate alterations caused by agricultural hail net coverage and effects on apple tree yield in subtropical climate of Southern Brazil
ABSTRACT The use of hail net coverage on plants is an effective measure to mitigate damage caused by hailstorms. In southern Brazil, areas with apple orchards under hail net coverage have increased in recent years. However, little is known about the possible effects on the microclimate and, consequently, on plant growth, crop yield and fruit quality. The hyp
Bragantia. Publicado em: 18/12/2017
-
14. Partitioning of the diffuse attenuation coefficient for photosynthetically available irradiance in a deep dendritic tropical lake
ABSTRACT We studied the effects of particulate and dissolved optically active components on the attenuation of photosynthetic active radiation (PAR) in a tropical lake. The temporal and spatial distribution of tripton, Chl-a and aCDOM(440) and their relative contribution to the diffuse PAR attenuation coefficient (Kd) was investigated at 21 sites (dry and we
An. Acad. Bras. Ciênc.. Publicado em: 2017-05
-
15. Consumo de agua y rendimiento de tomate de cáscara bajo diferentes cubiertas de invernaderos
ABSTRACT In Mexico, tomatillo (Physalis ixocarpa) is cultivated in the field, in small areas with low technology and low yields. To understand the behavior of tomatillo and increase its yield, the P. ixocarpa cv. Rendidora crop was evaluated. The evaluation was done in greenhouse under three protective structures covered with different materials and their in
Hortic. Bras.. Publicado em: 2017-04
-
16. INFLUENCIA DEL USO DE MALLA PERLA Y ROJA EN LAS CONDICIONES MICRO-CLIMÁTICAS, DAÑO POR SOL Y DESARROLLO DE COLOR DE FRUTOS EN HUERTOS DE MANZANOS CVS. GALA Y FUJI
ABSTRACT Sun damage and the lack of color of fruits produced by excessive solar radiation and high temperatures is the biggest production problem in apple orchards in Chile. The objective of this research was to evaluate the use of colored nets as a tool for control of sun damage and improve color on apples. During the 2012-13 and 2013-14 season ´Fuji´ an
Rev. Bras. Frutic.. Publicado em: 30/03/2017
-
17. Modeling the reflection of Photosynthetically active radiation in a monodominant floodable forest in the Pantanal of Mato Grosso State using multivariate statistics and neural networks
ABSTRACT The study of radiation entrance and exit dynamics and energy consumption in a system is important for understanding the environmental processes that rule the biosphere-atmosphere interactions of all ecosystems. This study provides an analysis of the interaction of energy in the form of photosynthetically active radiation (PAR) in the Pantanal, a Bra
An. Acad. Bras. Ciênc.. Publicado em: 15/08/2016
-
18. Planting spacing and NK fertilizing on physiological indexes and fruit production of papaya under semiarid climate
ABSTRACT The nutritional requirements of papaya (Carica papaya L.) increase continuously throughout the crop cycle, especially for potassium and nitrogen, which are the most required nutrients and act on plant vital functions such as photosynthetic activity, respiration, transpiration and stomatal regulation. An experiment was conducted from November 2010 to
Bragantia. Publicado em: 04/12/2015
-
19. Ground level photosynthetically active radiation dynamics in stands of Acacia mearnsii De Wild
RESUMOO objetivo é estudar a dinâmica da radiação fotossintética alcançando a superfície do solo em povoamentos de Acacia mearnsii De Wild e sua influência no crescimento em altura em povoamentos. Este fato dá origem à formulação da seguinte hipótese para este estudo: "A redução da incidência de luz no interior do suporte de acácia negra vai
An. Acad. Bras. Ciênc.. Publicado em: 15/09/2015
-
20. Microclimate and soil moisture in a silvopastoral system in southeastern Brazil
In this study, the microclimate changes in silvopastoral systems are quantified at different time and spatial scales and compared with single-pasture systems. The study was conducted in a silvopastoral system in São Carlos, Brazil (22°01' South and 47°53' West). The silvopastoral system consisted of grass pastures [Urochloa (sin. Brachiaria) decumbens cv.
Bragantia. Publicado em: 2015-03
-
21. ÍNDICE RELATIVO DE CLOROFILA PARA O DIAGNÓSTICO DO ESTADO DE NITROGÊNIO EM HÍBRIDOS DE MILHO
Nitrogen (N) is the nutrient that contributes the most to increase productivity of corn hybrids. For this reason, the main objective of this study is to determine the relative chlorophyll index (RCI), in different leaves and phenological stages, aiming diagnosing N state in corn hybrids according to the N doses applied in coverage, correlating them with the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2012
-
22. Relationships of photosynthetic photon flux density, air temperature and humidity with tomato leaf diffusive conductance and temperature
The objective was to study the leaf temperature (LT) and leaf diffusive vapor conductance (gs) responses to temperature, humidity and incident flux density of photosynthetically active photons (PPFD) of tomato plants grown without water restriction in a plastic greenhouse in Santa Maria, RS, Brazil. The plants were grown in substrate and irrigated daily. The
Brazilian Archives of Biology and Technology. Publicado em: 2012-06
-
23. Chemical composition and photosynthetically active radiation of forage grasses under irrigation
The present study aimed to estimate the photosynthetically active radiation of tropical forage grasses in ten cutting dates, under irrigation. The following treatments were used: Brachiaria decumbens grass (Brachiaria decumbens cultivar Basilisk), Marandu grass (Brachiaria brizantha cultivar Marandu), Xaraes grass (Brachiaria brizantha, cultivar Xaraes), Mom
Revista Brasileira de Zootecnia. Publicado em: 2012-03
-
24. Relationship between photochemical efficiency (JIP-Test Parameters) and portable chlorophyll meter readings in papaya plants
The Portable Chlorophyll Meter (PCM) is used to estimate the total chlorophyll and leaf nitrogen content of various species. Since there is a relationship between the chlorophyll concentration and the photochemical efficiency, a relationship can also be established between the PCM readings and some fluorescence variables to provide information on photosystem
Brazilian Journal of Plant Physiology. Publicado em: 2011