July 2016
Drippers used in vinasse application: Uniformity and obstruction
In sugar cane crop fertigation management systems, about 500 m3 ha-1 of diluted vinasse is applied annually by cycle, promoting nutrient recycling and supply to the soil, especially that of potassium (K). With the increase of sugar cane areas with subsurface drip irrigation, hydraulic characterization related to vinasse intermittent application is important, in order to verify uniformity flow in drippers. The aim of...
July 2016
Improving production of aromatic compounds by indigenous yeasts in Chenin Blanc grape must
The aim of this study was to evaluate the effect of indigenous yeasts on the aroma of fermented Chenin Blanc grape must by determining the volatile compounds, the odor activity value (OAV) and carrying out sensory analyses. The must, fermented by Hanseniaspora opuntiae/Saccharomyces cerevisiae combinations, presented higher concentrations of compounds such as ethyl acetate, ethyl hexanoate, 2-methyl-1-propanol and...
July 2016
Growth of Cordia trichotoma seedlings in different sizes of recipients and doses of fertilizer
This aim of this work was to evaluate the initial growth of Cordia trichotoma seedlings, submitted to different sizes of recipients and doses of controlled-release fertilizer (CRF). This experiment was performed in a greenhouse, and evaluation was done in factorial scheme using two volumes of recipients (110 and 180 cm3) combined with five doses of CRF (0 (controlled); 2.5; 5.0 and 7.5 g L-1 de substrate). The...
July 2016
Effects of ethylene on the postharvest quality of inflorescences of Oncidium varicosum ‘Samurai’
Oncidium varicosum is an orchid largely distributed in South America, whose inflorescences with bright yellow flowers are of rare beauty. One of the objectives of the postharvest physiology of flowers is the study of the factors related with the quality loss of cut flowers. The ethylene performs a very important function on the senescence of flowers because it induces abscission of flowers buds and open flowers causing...
July 2016
Impact of harvesting with burning and management of straw on the industrial quality and productivity of sugarcane
Change from the traditional harvesting system with burns to mechanized harvesting of sugarcane, as well as the amount of straw needed to remain in the field for sustainability of the production system and how much could be removed for sectors such as energy cogeneration and bioethanol production, are not clarified issues. The objective of this study was to evaluate the impact of harvest management with burning...
July 2016
Agronomic characteristics of corn in function of the application of K, S and Mo by foliar via with and without plaster in red Latosol
The study aimed to verify the response of the application of foliar fertilizers based on potash, sulfur and molybdenum, with and without plaster in the soil, on the agronomic traits of corn crop. The experimental design was a randomized block in a factorial 5 x 2 with four replications. The sources of variation showed no significant effect. These results indicate that the plaster efficiency in the agronomic...
July 2016
Termiticidal activities of few plant extracts against Macrotermes subhyalinus smeathman and Trinervitermes geminatus wasmann (Isoptera: Termitidae) survival
Termites are most pestiferous insects causing damage to crop and buildings. Their control still relies mainly on harmful chemical pesticides to the detriment of eco-friendly pesticides. The aim of this study was to evaluate the effect of three plant extracts on the survival rate of termite species, Macrotermes subhyalinus Smeathman and Trinervitermes geminatus Wasmann, known to cause damage to crops, vegetation and...
July 2016
Emergence and early growth of baru seedlings on different substrates
This study aimed to evaluate the effect of substrates in the emergence and early development of Baru seedlings. The experiment was performed in a greenhouse in a completely randomized design with five treatments (substrates) and four replications. The substrates were: S1) Oxisol; S2) Oxisol + washed sand (1: 1 v: v); S3) washed sand; S4) Oxisol + washed sand + manure (1: 1: 1 v: v: v); S5) Oxisol + sand washed +...
July 2016
Contribution of previous legumes to soil fertility and millet yields in West African Sahel
Studies on combined effects of 4 legume crops residues and rock phosphate application on pearl millet yield were undertaken on sandy acid soil field from 2012 to 2015 at ICRISAT Sahelian center (ISC)-Sadore, Niger. The objective of the experiment was to assess the best combination of legume species x rate of crop residue x rock phosphate doses that can sustainably improve pearl millet yield in cereal monoculture system...
July 2016
Biometric evaluation of monthly growth rate as a criterion to study the genetic diversity in Coffea canephora
The variability of growth patterns and capacity to resist to environmental stresses that exists in populations of Coffea canephora Pierre ex Froehner makes it possible to select genotypes for different types of cultivation conditions. The objective of this study was to evaluate the monthly growth rate as a criterion to measure the genetic diversity of genotypes and to estimate the direct and indirect effects of the...
July 2016
Camu-Camu super fruit (Myrciaria dubia (H.B.K) Mc Vaugh) at different maturity stages
Camu-camu (Myrciaria dubia) H.B.K.) Mc Vaugh) is a shrub native to the Amazon region and its fruits are promising sources of various bioactive compounds such as vitamin C, phenolic compounds and carotenoids. Camu-camu fruit is considered the greatest natural source of vitamin C worldwide and also good source of dietary fiber, potassium, iron, calcium, and various kinds of amino acids such as serine, valine and leucine....
July 2016
Hydrology and water quality of a underground dam in a semiarid watershed
In the Brazilian semiarid regions, underground dams can efficiently store water under possible scenarios of climate change. However, the annual humidity vector in these regions is vertical, and annual evapotranspiration exceeds annual rainfall, resulting in the accumulation of salts in groundwater reservoirs. This study investigated over the course of two agricultural years the hydrologic behavior, soil moisture and the...
July 2016
Lignin content in seed coats of Glyphosate-resistant soybean and their respective parents
The large-scale cultivation of Roundup Ready (RR) has recently increased among Brazilian farmers. However, few studies have compared the intrinsic characteristics of the seeds of RR soybean cultivars and their respective conventional parental. Thus, the purpose of this study is to verify if the genetic modification of the RR soybean affects the lignin content and its monomeric composition in the seed coats, in...
July 2016
Agronomic performance of common bean (Phaseolus vulgaris L.) according to foliar application of potassium silicate in two sowing times
Common bean (Phaseolus vulgaris L.) cultivation is of relevant economic importance for Brazil, since this legume is one of the main Brazilian staple foods. The objective of this study was to evaluate, in two sowing times, the agronomic performance of two bean cultivars according to foliar application of different doses of potassium silicate. Experiments were conducted under field conditions, in the rural area of the...
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