scholarly journals Edaphic Aptness of Subarid Soils to Lettuce (Lactuca sativa L.) Production in Social Dynamics Context of Diffa, Niger

Author(s):  
Boubacar M. Moussa ◽  
Laouali Abdou ◽  
Salamatou Abdourahamane Illiassou ◽  
Ali Mahamane

In the eastern Niger, vegetable crops such as lettuce are cultivated along the Komadougou Yobé river and near Lake Chad. Insecurity linked to terrorist groups prevents the exploitation of these areas and leads population to explore other lands. This study aims to find out whether sub-arid soils have in some places potentialities that can allow lettuce cultivation. A pedological survey was first carried out in the study area and some physicochemical soil parameters were analyzed. Then, a randomized experimental design with three cultivars (“Blonde de Paris”, “Iceberg Tahoma”, and “Iceberg edem”) and three replicates was carried out on soils which present favorable conditions for vegetable crops. The lettuce fresh mass was determined at harvest. The results show a significant influence of the geomorphological gradient on texture classes, nitrogen contents, pH values, cation exchange capacity and level of exchangeable bases. The lowland soils are more apt for vegetable crops like lettuce. The mean of lettuce fresh mass obtained for the three cultivars is 4.8±0.5 kg.m-². Iceberg Eden records the highest values and seems well adapted to eastern Niger.

2017 ◽  
Vol 135 ◽  
pp. 242-251 ◽  
Author(s):  
Jalal Shiri ◽  
Ali Keshavarzi ◽  
Ozgur Kisi ◽  
Ursula Iturraran-Viveros ◽  
Ali Bagherzadeh ◽  
...  

Agronomy ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1011 ◽  
Author(s):  
Vanesa Santás-Miguel ◽  
Manuel Arias-Estévez ◽  
Montserrat Díaz-Raviña ◽  
María José Fernández-Sanjurjo ◽  
Esperanza Álvarez-Rodríguez ◽  
...  

Toxicity on soil bacterial community growth caused by the antibiotics oxytetracycline (OTC) and chlortetracycline (CTC) was studied in 22 agricultural soils after 1, 8 and 42 incubation days. The leucine incorporation method was used with this aim, estimating the concentration of each antibiotic which caused an inhibition of 50% in bacterial community growth (log IC50). For OTC, the mean log IC50 was 2.70, 2.81, 2.84 for each of the three incubation times, while the values were 2.05, 2.22 and 2.47 for CTC, meaning that the magnitude of OTC toxicity was similar over time, whereas it decreased significantly for CTC with incubation time. In addition, results showed that the toxicity on bacterial community growth due to CTC is significantly higher than when due to OTC. Moreover, the toxicity on bacterial community growth due to both antibiotics is dependent on soil properties. Specifically, an increase in soil pH and silt content resulted in higher toxicity of both antibiotics, while increases in total organic carbon and clay contents caused decreases in OTC and CTC toxicities. The results also show that OTC toxicity can be well predicted by means of specific equations, using the values of pH measured in KCl and those of effective cation exchange capacity as input variables. CTC toxicity may be predicted (but with low precision) using pH measured in KCl and total organic carbon. These equations may help to predict the negative effects caused by OTC and CTC on soil bacteria using easily measurable soil parameters.


2021 ◽  
pp. 116-121
Author(s):  
N. N. Dubenok ◽  
A. V. Gemonov ◽  
A. V. Lebedev ◽  
O. E. Efimov ◽  
A. A. Prokhorov

Relevance. The use of irrigation is one of the directions of intensification of fruit growing. Drip irrigation is considered one of the promising methods of irrigation, which provides the creation of the most favorable conditions for the growth and development of plants, makes it possible to supply irrigation water directly to their roots and allows the use of automation tools in the irrigation process. The results of ongoing scientific research show that changes in the water-physical and agrochemical properties of soils can be observed on irrigated lands. For the Central Region of the Non-Chernozem Zone of Russia, studies on the influence of drip irrigation on soil properties are fragmentary.Methods. Field studies were conducted on the territory of the educational experimental farm of the Michurinsky Garden fruit growing laboratory of the Russian State Agrarian University - Moscow Timiryazev Agricultural Academy. A two-factor experience in the study of different ranges of moisture for the formation of varietal plum seedlings grafted on plum tree stock was laid in the spring of 2018. Before setting up the experiment, organic fertilizers were introduced in the form of horse manure with sawdust in the amount of 100 t/ha. Soil moisture was controlled using tensiometers, calibrated based on the data of the thermostat-weight method. Irrigation rates were set in such a way as to increase the moisture content by 20% of the lowest moisture capacity. The identification of the main agrochemical and water-physical properties of the soil in the experimental plot was carried out according to generally accepted methods and techniques.Results. The data obtained on the characteristics of the water-physical and agrochemical properties of sod-podzolic soil make it possible to reasonably design the irrigation regime, reclamation and agrotechnical measures. The results of the study show that the local irrigation of soils with sparing irrigation rates with the application has led to certain changes in some soil parameters. However, the obtained research results suggest that in quantitative terms, these changes are not yet significant.


Author(s):  
I.M. Konovalenko

Ассоциация независимых российских семенных компаний (АНРСК) системно продвигает свою позицию на всех уровнях власти. Одним из самых основных вопросов в работе ассоциации на сегодняшний день остается приведение законодательной и нормативно-правовой базы в отвечающее и дающее развиваться отрасли русло. Цель работы: проанализировать современную законодательную и нормативно-правовую базу в сфере селекции и семеноводства овощных культур и выявить в ней проблемные области, требующие принятия соответствующих поправок. При анализе использовали абстрактно-логический метод, включающий совокупность приемов индукции и дедукции, анализа и синтеза, аналогии, сопоставлений, системно-структурный анализ, методы формализации, моделирования, прогнозирования. Обосновано, что только став конкурентоспособным, сельское хозяйство и отдельные его отрасли, могут получить часть мирового рынка, в котором сегодня по целому ряду отраслей Россия серьезно уступает другим государствам. Показана роль частных селекционных компаний, мировых зон товарного семеноводства и ассоциаций в формировании цивилизованного рынка семян овощных культур. Дается определение стран с европейской и американской моделью законодательной базы. Приводятся факты поддержки государством селекционных компаний за рубежом. Сделан вывод о том, что во всех странах, в которых работают селекционные и семеноводческие компании, со стороны государств системно создаются благоприятные условия для их развития. Поэтому, если сегодня в РФ ставятся задачи импортозамещения и создания экспортного потенциала, нужно объективно взглянуть на состояние отечественной селекции и семеноводства овощных культур, определить их путь развития и создать под это соответствующую законодательную и нормативно-правовую базу. Нужны грамотные системные профессиональные решения, соответствующие законодательные и нормативно-правовые акты, а также снижение административной нагрузки.The Association of independent Russian seed companies (AIRSC) systematically promotes its position at all levels of government. One of the most important issues in the work of the Association today is to bring the legislative and regulatory framework in line with the development of the industry. Objective: to analyze the current legislative and regulatory framework in the field of selection and seed production of vegetable crops and identify problem areas that require the adoption of appropriate amendments. The analysis used an abstract logical method that includes a set of methods of induction and deduction, analysis and synthesis, analogy, comparisons, system-structural analysis, formalization, modeling, and forecasting. It is proved that only by becoming competitive, agriculture and some of its branches can get a part of the world market, in which today Russia is seriously inferior to other countries in a number of industries. The role of private breeding companies and world zones of commodity seed production and associations in the formation of a civilized market for vegetable seeds is shown. The definition of countries with the European and American model of the legal framework is given. The facts of state support for breeding companies abroad are given. It is concluded that in all countries where breeding and seed companies operate, favorable conditions for their development are systematically created by the States. Therefore, if today the tasks of import substitution and creation of export potential are set in the Russian Federation, it is necessary to take an objective look at the state of domestic selection and seed production of vegetable crops, determine their path of development and create an appropriate legislative and regulatory framework for this. We need competent system professional solutions, appropriate legislative and regulatory acts, and reducing the administrative burden.


Author(s):  
V. V. Rzaeva ◽  
◽  
E. A. Krasnova ◽  

The solution to the problem of feed protein deficiency is possible with an increase in acreage and the selection of agrotechnical methods of soybean cultivation, taking into account the conditions of the natural and climatic zone. One of the main elements of the farming system that allows to increase the yield of soybeans is rational basic tillage, its depth depending on the type of soil, providing favorable conditions for plant growth and development, which has not been studied in the northern forest-steppe in the Tyumen region. The purpose of the work was to study the influence of agrotechnical techniques on soybean productivity in the northern forest-steppe in the Tyumen region. During the research the influence of basic tillage and its depth on agrophysical (soil density, reserves of productive moisture), agrochemical soil parameters, uniformity of sowing depth, germination and preservation of soybean plants has been established. The contamination of crops, the species composition of weeds, and the degree of contamination during soybean cultivation by basic tillage with the use of herbicide during the growing season has been studied. It has been found that the highest level of profitability of 39,7 % was achieved with the differentiated method of tillage, with the mouldboard plowing (20–22 cm) it was less by 7,2 %, with the subsurface tillage (20–22 cm) it was less by 19,3 %. The decrease in the depth of processing leads to the decrease in the level of profitability by 4,0 % with the mouldboard plowing, by 2,2 % with the subsurface tillage and by 7,4 % with the diff erentiated method. With zero tillage, the profitability level was below control by 14,6 %. Thus, the most cost-effective was the differentiated method of tillage (20-22 cm) with the profitability level of 39,7 % and a profit of 9765 rubles/ha.


Author(s):  
Alberto C. de C. Bernardi ◽  
Célia R. Grego ◽  
Ricardo G. Andrade ◽  
Ladislau M. Rabello ◽  
Ricardo Y. Inamasu

ABSTRACT The knowledge of soil property spatial variability is useful for determining the rational use of inputs, such as the site-specific application of lime and fertilizer. The objective of this study was to evaluate the vegetation index and spatial variability of physical and chemical soil properties in an integrated crop-livestock system (ICLS). Soil samples were taken from a 6.9 ha area in a regular hexagon grid at 0-0.20 m depths. Soil P, K, Ca, Mg, and cation exchange capacity - CEC; base saturation; clay and sand were analyzed. Soil electrical conductivity (ECa) was measured with a contact sensor. The site was evaluated at the end of the corn season (April) and during forage production (October) using Landsat 5 images, remote sensing techniques and a geographic information system (GIS). Results showed that the normalized difference vegetation index (NDVI) was associated with ECa and soil parameters, indicating crop and pasture variations in the ICLS. Geostatistics and GIS were effective tools for collecting data regarding the spatial variability of soil and crop indicators, identifying variation trends in the data, and assisting data interpretation to determine adequate management strategies.


2020 ◽  
Vol 55 (8) ◽  
pp. 1209-1229
Author(s):  
Victor Chidubem Iwuoha

This article investigates how migrant petty trading populations confront social systems/perceptions of their host localities and the effects on the sustainability of their trading activities. I examine clusters of long-term migrant petty traders (LTMs) and very recent migrant petty traders (VRMs) (i.e. from Lake Chad region: Chad, Cameroon and Niger) found in Nigerian peri-urban areas. Adopting Kaufman’s symbolic-analytic model, I argue that a mix of socio-economic factors – peri-urban residents’ negative perception of migrant petty traders, divergence in symbolic attachments, and a low patronage system – affect the growth of the migrant petty trade sector in specific localities.


GeoScape ◽  
2017 ◽  
Vol 11 (2) ◽  
pp. 112-120 ◽  
Author(s):  
Kateřina Rudincová

AbstractThe Lake Chad basin is one of the most unstable regions in Africa. The lake itself has shrunk and nowadays it covers less than 10 % of its area in 1960. These environmental changes have wider geopolitical consequences in the whole region, which encompasses countries such as Nigeria, Niger, Chad and Cameroon. Therefore, it seems that environmental threats may act as the detonators for larger political conflict as well as for a struggle for land and may cause growing instability in affected countries. The region is fragile, owing to the fact that several terrorist and Islamist groups are operating there. The most serious threat in the Lake Chad basin is militant Islamist group Boko Haram, which is based in north eastern Nigeria, but it is also active in neighbouring countries. As a result of both ecological changes and security threats, people are losing their traditional sources of income from herding and it is likely that there will be large waves of migration from the area. The paper focuses on the environmental challenges in the Lake Chad basin and their effect on the security in the region. The main attention will be paid to the strategies and actions of militant terrorist groups such as Boko Haram that will be analysed in the wider regional geopolitical context.


Author(s):  
Serhii PIDSHYBIAKIN

The perception of the Ilovaisk tragedy of 2014 in the discourse of Ukrainian public opinion is analyzed. The tragedy («Ilovaisk cattle») was in surrounding a group of Ukrainian troops about 1,200 soldiers by the regular units of the Armed Forces of the Russian Federation (RF Armed Forces) and Russian terrorist groups near Ilovaisk, Donetsk region. While leaving the «cattle» through the humanitarian corridor, the Ukrainian soldiers came under shelling by the Russian side. Pro-government circles saw among the causes of such a tragic situation the treachery of the Russian leadership. Previously having agreed with Kyiv that it would release Ukrainian fighters from the encirclement, it eventually committed the shootings. Another reason was the betrayal of some Ukrainian soldiers who deserted from defensive positions, creating for the enemy favorable conditions to encircle. The participants of the events, experts, media partly accused the Ukrainian state and military leadership of inertia, passivity, and ignoring reports about the need for reinforcements. However, some military analysts acknowledged that the Ukrainian military command had done everything possible in the circumstances. Along with Russian intervention as the main part in the Ilovaisk tragedy, some experts saw a benefit for some Ukrainian politicians, as the constant threat factor could be used in the run-up canvassing to the October 2014 snap parliamentary elections. Finally, the criminal case concerning the Ilovaisk tragedy, which continues up today, has already been assessed by the Prosecutor General's Office of Ukraine (GPU). According to assessment, the deaths of Ukrainian soldiers and the loss of weapons and military equipment near Ilovaisk were directly connected with the actions of the RF Armed Forces, which on August 23-24, 2014, treacherously invaded the Donetsk region and murdered Ukrainian soldiers. It was concluded that the Ilovaisk tragedy had not only hard military but also political consequences for the country, in particular, due to the adoption of the Minsk agreements under the pressure of the tragedy, which showed itself in an imperfect «truce», which, was repeatedly violated by the enemy. Keywords: Ilovaisk tragedy, Ukrainian public opinion, politicum, mass media, expert circles, Ukraine, Russia.


2020 ◽  
Vol 11 ◽  
pp. e3329
Author(s):  
Michele Ribeiro Ramos ◽  
Talita Maia Freire ◽  
Francisca Marta Barbosa Dos Santos ◽  
Alexandre Uhlmann ◽  
Danilo Marcelo Aires Dos Santos ◽  
...  

Pineapple (Ananas comosus (L.) Merril) is considered one of the most important fruits of the tropical and subtropical regions, and the third most-produced in the world due to its high commercial expansion in the world market, in recent years. Therefore, this work aimed to evaluate the influence of landscape position on pineapple quality. The work was developed at the Providência Farm, located in the municipality of Miracema do Tocantins. The following soil parameters were evaluated: hydraulic conductivity - KS, soil bulk density – DS, and total porosity – TP, as well as the following quality attributes: titratable acidity - TA, length and diameter of infructescences, total fresh mass - TM, fresh mass of infructescences – IM, and soluble solids – SS. The analyses were performed at the Agri-Environmental Laboratory of the Agricultural Sciences Complex of the Federal University of Tocantins. Less massive infructescences developed on more porous soils. The variation in the mass of infructescences is not associated with soil types, but rather with soil porosity. Soils with higher KS tend to increase the chances of producing infructescences with high acidity and high levels of soluble solids. The DS did not result in a significant association with the pineapple quality attributes. The infructescences were not affected by the landscape position. No position in the landscape influenced fruit quality. In general, the infructescences showed low acidity and low levels of soluble solids, with length and diameter of infructescences below the standard of the cultivar ‘Pérola’.


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