|
|
|
|
|
| Cortez,Jorge W.; Lopes,Hélio L.; Coelho,Daniela S.; Arcoverde,Sálvio N. S.. |
| Since the advent of mechanized farming and intensive use of agricultural machinery and implements on the properties, the soil began to receive greater load of machinery traffic, which can cause increased soil compaction. The aim of this study was to evaluate the spatial variability of soil mechanical resistance to penetration (RP) in the layers of 0.00-0.10, 0.10-0.20, 0.20-0.30 and 0.30-0.40m, using geostatistics in an area cultivated with mango in Haplic Vertisol of the northeastern semi-arid, with mobile unit equipped with electronic penetrometer. The RP data was collected in 56 points from an area of 3 ha, and random soil samples were collected to determine the soil moisture and texture. For RP data analysis we used descriptive statistics and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil compaction; Machinery traffic; Agricultural mechanization. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000200006 |
| |
|
|
| Coelho,Daniela S.; Simões,Welson L.; Mendes,Alessandra M. S.; Dantas,Bárbara F.; Rodrigues,José A. S.; Souza,Moisés A. de. |
| O objetivo deste trabalho foi avaliar a tolerância à salinidade de seis variedades de sorgo forrageiro a partir da porcentagem de germinação e do crescimento inicial das plântulas submetidas a seis níveis de salinidade. Utilizou-se o delineamento experimental inteiramente casualizado, em esquema fatorial 6 x 6, com quatro repetições contendo 25 sementes. Os tratamentos foram seis variedades (V) de sorgo forrageiro [F305 (V1), BRS 655 (V2), BRS 610 (V3), Volumax (V4), 1.015.045 (V5), 1.016.005 (V6)] e seis níveis de salinidade [0 (água destilada); 2,5; 5,0; 7,5; 10 e 12,5 dS m-1]. O experimento foi conduzido no Laboratório de Sementes da Embrapa Semiárido, em agosto de 2012. Foram avaliados a percentagem de germinação, o comprimento da parte aérea (PA) e da... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sorghum bicolor; Salinidade; Plântulas; Tolerância. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014000100004 |
| |
|
|
| Coelho,Daniela S.; Simões,Welson L.; Salviano,Alessandra M.; Mesquita,Alessandro C.; Alberto,Keila da C.. |
| ABSTRACT Adaptation of plants to saline environments depends on the activation of mechanisms that minimize the effects of excess ions on vital processes, such as photosynthesis. The objective of this study was to evaluate the leaf gas exchange, chlorophyll, and organic solute in ten genotypes of forage sorghum irrigated with solutions of different salinity levels. The experiment was conducted in a randomized block design, in a 10 x 6 factorial arrangement, with three replications, using ten genotypes - F305, BRS-655, BRS-610, Volumax, 1.015.045, 1.016.005, 1.016.009, 1.016.013, 1.016.015 and 1.016.031 - and six saline solutions, with electrical conductivity (ECw) of 0, 2.5, 5.0, 7.5, 10 and 12.5 dS m-1. The photosynthetic activity in forage sorghum plants... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Salt stress; Photosynthesis; Chlorophyll; Sorghum bicolor (L.) Moench. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000400231 |
| |
|
|
|
