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Mostrando ítems 11-20 de 2052
Root system and its relations with soil physical and chemical attributes in orange culture
(2021-02-02)
Citrus companies have sought and developed alternative systems of tillage or implanting orchards so as not to significantly alter the physical and chemical attributes of the soil and, consequently, the root development of ...
Estimation of soil organic matter content by modeling with artificial neural networks
(2019-09-15)
Soil organic matter has direct relationship with soil fertility and quality. However, its estimation in laboratory generates chemical residues which can contaminate the environment, and more ecological methods to determine ...
Chemical soil attributes evaluated by multivariate techniques and geostatistics in the area with agroforestry and sugarcane in HumaitÁ, AM, BrazilAtributos químicos do solo avaliados por técnicas multivariadas e geoestatísticas em área com agrofloresta e cana-de-açúcar em Humaitá, AM, Brasil
(2016-01-01)
Studies on the spatial behavior of soil attributes in the Amazon region are still very incipient. In this sense, the objective of this work was to evaluate the chemical attributes through multivariate techniques and ...
Chemical bonding and composition of silicon nitride films prepared by inductively coupled plasma chemical vapor deposition
(ELSEVIER SCIENCE SA, 2010)
Thin silicon nitride films were prepared at 350 degrees C by inductively coupled plasma chemical vapor deposition on Si(100) substrates under different NH(3)/SiH(4) or N(2)/SiH(4) gas mixture. The chemical composition and ...
Multivariate analysis in the evaluation of soil attributes in areas under different uses in the region of humaitá, AMAnálise multivariada na avaliação de atributos do solo em áreas sob diferentes usos na região de humaitá, AM
(2019-01-01)
The recognition of the influence of management practices on soil physical and chemical conditions is substantial for sustainable agriculture. For this reason, this study was developed for the purpose of evaluating the ...
Changes in growth and chemical defences upon defoliation in maize
(1998)
The effect of defoliation on growth and on levels and allocation patterns of hydroxamic acids (Hx) in maize seedlings was evaluated 6 days after treatment. No significant differences were found between defoliated and ...
Molecular vibrational constants and chemical bonding in five-membered heteratomic compounds
(1985)
By means of the force field and mean amplitudes of vibration of furan, thiophene, selenophene and tellurophene molecules, we have concluded that the ground-state aromaticity order in the series is thiophene > tellurophene ...
Otimização amostral de atributos de latossolos considerando aspectos solo-relevo
(Universidade Federal de Santa Maria (UFSM), 2006-06-01)
O custo de amostragem do solo para caracterizar a variabilidade espacial de atributos químicos e físicos é um problema em agricultura de precisão. O objetivo deste trabalho foi utilizar a forma da paisagem como critério ...