RESEARCH ON ESTABLISHING ECHNOLOGICAL PARAMETERS WITH HIGH EFFICIENCY IN JERUSALEM ARTICHOKE CULTURE

In the period 2018-2020. within RDSFCSS Dabuleni, from Romania, 4 planting epochs were studied and 2 harvest epochs. Determinations were made on the number of tubers/plant, the average weight of a tuber and the production per unit area. Regardless of the planting epoch both the number of tubers/plant and the average weight of a tuber was higher in the plants  harvested after 29 weeks after planting. The highest production of tubers was obtained by planting Jerusalem artichoke between April 15-25 and harvested after 29 weeks. In this variant. the production was 66.02 t / ha. corresponding to a number of 45.9 tubers / plant. with an average weight of 47.8 g / tuber

Some integrability conditions for almost K\"ahler manifolds

Among other results, a compact almost K\"ahler manifold is proved to be K\"ahler if the Ricci tensor is semi-negative and its length coincides with that of the star Ricci tensor or if the Ricci tensor is semi-positive and its first order covariant derivatives are Hermitian. Moreover, it is shown that there are no compact almost K\"ahler manifolds with harmonic Weyl tensor and non-parallel semi-positive Ricci tensor. Stronger results are obtained in dimension 4.Comment: Latex2e, 13 page

RESULTS REGARDING THE FERTILIZATION OF THE SUNFLOWER CROP WITH AN EFFLUENT OBTAINED BY WASTEWATER TREATMENT

The research was carried out in 2020 on the sunflower crop grown in sandy soils in southern Oltenia and aimed at the influence of fertigation with an effluent obtained by wastewater treatment, compared to conventional fertilization and irrigation with normal water from surface water sources. The obtained results showed the positive influence, on the nutritional status of the plant, of ensuring the dose of nitrogen in the vegetation by fertigation with purified water, applied fractionally in 2-3 steps (Nt-3.5%; Pt = 0.35% Kt = 2.7%), compared to classical fertilization and irrigation with normal water from surface water sources. It was noted with the best results on production (4427.5 kg / ha) and the weight of one thousand grains (69 g), the variant in which the dose of 70 kg N / ha, required in vegetation, was ensured by irrigation with treated water,  applied fractionally in two doses of 50%, starting with the phase of 5-7 leaves.Â

RESEARCH ON THE INFLUENCE OF FERTILIZATIONS ON THE NUTRITIONAL QUALITY OF GRAIN SORGHUM IN THE CONDITIONS OF SANDY SOILS IN SOUTHERN OLTENIA

Research conducted at SCDCPN Dăbuleni in the period 2018-2019, regarding the influence of the fertilization system on the nutritional quality of grain sorghum, has revealed different results, due to both the applied fertilization and the climatic conditions of the study period. The most balanced biochemical composition of sorghum beans was obtained in the fertilized variant with N150P80 K80 + biostimulatory (ALBIT-40 ml / ha) (11.72% humidity, 13.50% protein, 906.39 kg / ha protein, 6714kg / ha grain production, 3.53% fat, 87 kg / hl hectolitric mass, 29g mass of 1000 grains). The amount of protein expressed as a percentage increased with the increase of the production but insignificant, and the quantity of protein expressed in kg / ha increased with the increase of the distinct grain production significantly. Regarding the influence of the study years, the best results were obtained in the climatic conditions of the year 2018, which was characterized by maximum average temperatures of 26.6 0C, in the summer months and with significant precipitations during the period May-July (106.6-195.2mm)

THE BEHAVIOR OF VARIETIES OF JERUSALEM ARTICHOKE ON THE SANDY SOILS FROM SOUTH OF OLTENIA

The Jerusalem artichoke (Helianthus tuberosus) is considered a species with relatively high tolerance to water stress and very high adaptability to extremes of unfavorable factors - drought resistance, at extremely high temperatures (350- 450C the plants and -300 -450C the tubers). The tubers with high inulin content are formed on the root branches and are increasingly used as food for patients with diabetes. The variety is one of the main factors of the technology, the cultivation of a variety should be done only after a preliminary test regarding its adaptability to the natural environmental factors. On the sandy soils from Dabuleni were studied the varieties Dacic, Olimp, Rustic and the local population Dăbuleni. It was noted by the number of tubers/plant the Olimp variety with 60.4 stems/plant, and the highest weight of a tuber was recorded in the Rustic variety (51.6 g/tuber). The highest production was made at the Olimp variety, respectively 70.03 t/ha, corresponding to the largest number of tubers harvested at a plant, followed by the production of the Rustic variety of 51.97t/ ha. At the Dacic variety, 15.6 t/ha were obtained, and the local population of Dăbuleni achieved the lowest production (6.45 t/ha). The inulin content was between 12.49% in the Rustic variety and 14.47% in the Olimp variety. Dacic varieties and local population Dăbuleni were highlighted by high in total dry matter, soluble dry matter and soluble carbohydrates, and Rustic varieties and local population Dabuleni were high in vitamin C content (14.92-14.96 mg)

The Dimension, Diversity and Complexity of the Macroeconomic Risk

The approach at a macroeconomic level of the challenges in order to foster the competitiveness in certain economic areas implies understanding and assessing the risk as an essential element which can determine in every moment the availability of the mechanisms and the necessary resources for a sustainable future. Even if in a certain measure the risk has to be assumed, the losses caused by undesired events seem to be more ample than the benefits. The most important aspect and part of the risk management is represented by the fact that risk has to be distributed over time, its effects being extended for long periods. While the benefits are hard to distinguish, the efforts seem to be determined at short notice. Any privation of the risk indicators that are correlated with the long-term objectives leads to a barrier when it comes     to monitoring the exactitude and performance of the decision-makers. Despite the struggle against the global pressure and the political risk, at a macroeconomic level the uncertainty does not only lingers in association with the external framework, but it also succeeded in reaching extreme levels in comparison with the recent history. The present article aims to observe, categorize and explain the dimension, diversity and complexity of the macroeconomic risk and it will also try to demonstrate that when    it comes to composite systems, the risk follows the same path as the environmental context, all because of the diversified overlaps between financial systems and societies, together with their economies and ecosystems. Keywords: integrated risk management, risk society, uncertaint

RESEARCH ON THE INFLUENCE OF SOIL WORKS ON COWPEA CULTIVATED UNDER ECOPEDOLOGICAL CONDITIONS IN SOUTHERN OLTENIA

The results obtained in the cowpea culture, studied during 2016-2018 in the conditions of the sandy soils, highlight the importance of germination bed preparation and the size of the nutrition space on the growth and fructification processes of the plant.  Analyzing the soil moisture dynamics during the plant vegetation, there is a better conservation of water in the soil, when was performed by plowing at a depth of 22-25 cm + disking to a depth of 10-15 cm,the soil moisture being within the limits of 6.98-16.8%. The best results were recorded by sowing 25 germinable seeds / m2 in a germination bed prepared by the plowing at a depth of 22-25 cm + disking of 10-15 cm deep (9.75 pods / plant, 8.85 grains / pod, 2483.5 kg / ha). This version was recorded the lowest level of weed (scoring on the EWRS scale with note 2.0, in the branching phase and 1.66, in the flowering phas

EVALUATION OF THE QUALITY AND AVAILABILITY FOR IRRIGATION OF WATER FROM DIFFERENT SOURCES FROM SOUTHERN OLTENIA

The researches were carried out under the conditions of 2019 and aimed at assessing the quality and availability for irrigation of groundwater and surface water from different sources located on the territory of Dabuleni Research Development Station for Plant Culture on Sands (Dabuleni RDSPCS). The results regarding the quality of the water showed different values according to the source and climatic conditions. The average values regarding the fixed mineral residue, pH, nitrate content and ammonium ions, determined in 9 working points, show that the analyzed sources cannot be used as drinking water, but can be used for irrigation of agricultural crops. The obtained results showed the following water quality indicators: mineral residue = 475 -1350 mg / dm3; pH = 7.05 - 8.43; nitrates = 10.23 - 28.08 mg / dm3, ammonium (NH4 +) = 1.73 - 8.82 mg/dm3