Search results for "practices."

Simulation study of the effects of intensified crop management in genetically manipulated maize on arable weed flora and associated fauna

2014

International audience; Cultivation of GM crops with herbicide tolerance is mostly associated with changes in crop and weed management, like simplified rotations, simplified tillage and change from selective herbicides to the broadband glyphosate. All of these management practices decrease weed densities in crops and change their composition. Although weeds cause yield loss and harvest problems, they are an important part of arable biodiversity and offer food and habitat for different groups of animals. A simulation study was conducted to analyse indirect effects of intensified cropping in GM maize on biodiversity. The dynamic crop: weed model FlorSys was used to simulate weed densities and…

Disentangling local agronomic practices from agricultural landscape effects on pest biological control

2019

International audience; The biological control of crop pests is a valuable service provided by various beneficial organisms that are naturally present in agricultural landscapes. Semi-natural habitats has long been recognized as essential to preserve beneficial insects, but proof of their efficiency to enhance biological control of pests remains non conclusive. Here, we examined the variability of landscape effect on biological pest control and the way local agronomic practices may modulate it. Biological pest control was monitored in 80 commercial fields (arable crops and orchards) during three consecutive years in four contrasting French agricultural landscapes distributed along a double …

Are maternal practices associated with children’s eating difficulties?

2013

Young children’s eating behaviors: the links with fathers’ and mothers’ feeding practices

2019

International audience; Parental feeding practices – the strategies to control ‘what', ‘how much', ‘when', ‘where', and ‘how' a child eats1 – can be a tool to promote healthy eating habits from a very young age. To support parents in feeding in the best possible way, it is crucial to have a profound understanding of the precise effect of these feeding practices on both the qualitative (e.g., food neophobia) and quantitative dimensions (e.g., self-regulation of intake) of a child's eating behavior. Some feeding practices potentially have a beneficial effect on one dimension, but a deleterious effect on the other dimension. It is also important to gain more insights in the role of fathers in …

Use of added sugar, salt and fat in the first year in France and associated factors in the ELFE cohort study

2018

National audience; Background and Aims: To describe added sugar, salt and fat uses and their determinants during complementary feeding (CF) period in infants aged 3 to 10 months. Methods: Data are drawn from the ELFE study (Etude longitudinale Française depuis l'Enfance) which included >18000 infants in 2011. A frequency food questionnaire of consumption of added sugar, salt and fat was monthly completed by the mother from the 3rd to the 10th month (N=10,649). The associations between the use of each added-ingredient and (1) socio-economic characteristics and (2) infant care and feeding practices were studied with two models (the second including the factors of the first) with multivariate …

Maternal and paternal feeding practices: links with child eating behaviors and effects of couples' concordant/discordant practices

2021

International audience; Past research has mainly focused on mothers' feeding practices. This study aimed to study (1) gender differences in parental feeding practices, and (2) the impact of couples' concordant/discordant food parenting practices on child eating behaviors. To do so, both parents of 105 French children aged 2.01-6.51 years (51.4% boys, Mage= 3.88 years, SD=1.40) filled in a survey with items from validated questionnaires. Results showed that fathers and mothers had similar perceptions about their child's eating behaviors (Pearson correlations between 0.34 and 0.78; M=0.60), despite fathers taking significantly fewer meals with their child than mothers. Fathers reported using …

Ecology of N2O reducing bacteria in arable soils

2016

Nitrous oxide (N2O) is an important greenhouse gas (GHG) and the main ozone depleting substance. Agricultural soils are the main anthropogenic-induced source of this GHG. The concentration of N2O in the atmosphere is steadily increasing, but we still lack knowledge on the factors controlling its production and consumption in soils. The reduction of N2O to N2 by microorganisms harboring the N2O reductase gene (nosZ) is the only known biological process able to consume this GHG. Recent studies revealed a previously unknown clade of N2O-reducers which was shown to be important to the N2O sink capacity of soils. This thesis seeks to gain a greater understanding on the ecology of N2O-reducers in…

Analyze and simulation a dynamic of soil indicators fertility under different agricultural management practices in cotton area of Togo

2011

Using data observed during 20 to 40 years in different agro-ecosystems of Togo, we analyzed soil fertility dynamic under different agricultural management practices. Tree soil C models of varying complexity were tested, and the most accurate in terms of soil C dynamics description in these tropical soils was associated with the QUEFTS model and with nutrient partial balance to analyze the effect of each agricultural management practice. Results indicated that, although fertilizers N, P and K were continuously applied at a recommended rate by the research (RR) or at this rate increased in 50% (1.5RR), initial cotton and cereals yields of 1.5 to 2 t ha˗1 and 2 to 3 t ha˗1, respectively, decre…

Gestion du pâturage au printemps en système bovin allaitant : diversité des pratiques en Saône-et-Loire

2009

National audience; Grazed grass is the cheapest forage for making meat'. In order to incite farmers to make their forage systems more self-sufficient and thrifty, the 'Chambre d'Agriculture de Saone-et-Loire' (a professional agricultural organization for that departement) has been monitoring for five years the management of spring grazing on 23 farms. The analysis of farmers' practices lead to considerations as to put to the best use the grazed grass, according to the pedo-climatic conditions and the constraints of the farms. With the aim of optimizing the pasture resources in order to limit the purchase of concentrates and to cope with the climatic hazards, the study of the management of s…

Transition to conservation agriculture : changes in cropping practices and responses of weed communities

2020

Conservation agriculture is a farming system based on the continuous and simultaneous application of three principles: minimal soil disturbance, continuous residue cover on the soil surface and diverse crop rotations. Adoption of this form of sustainable agriculture in France since the 2000s has been hampered by a number of constraints, including the development and management of weed populations. From an agronomic point of view, the adoption of conservation agriculture and associated abandonment of tillage results in a significant loss of weed management practices for farmers. From an ecological point of view, its application can modify all the assembly processes that act on weed communiti…