Microalgae and cyanobacteria are a potentially sustainable alternative for the improvement and protection of agricultural crops. Mineral fertilizers raise environmental and health issues. and current agricultural practices depend to a large extent on the application of fertilizers and pesticides. In this study. we examined the effect of cyanobacteria and microalgae on tomato seed germination. seedling growth. green and dry biomass. gas exchange from leaves (plant photosynthesis and transpiration). and the chlorophyll content of leaves (chlorophyll a. b and carotene). as well as on the soil respiration process. The obtained results highlight higher values of green and dry biomass in the variants inoculated with cyanobacteria and microalgae compared to the control variant and comparable to the values obtained in the technologically fertilized variants. Tomato seedlings showed higher photosynthesis values compared to the control and compared to the technologically fertilized variant in the soil of the pea plot (7.06 μmol CO2 / m2 / s compared to 6.33μmol CO2 / m2 / s in the control variant and 7.06 μmol CO2 / m2 / s in the technologically fertilized version). And in the case of the soil in the museum plot. the values of photosynthesis in the version with the inoculum of cyanobacteria and microalgae were statistically assured compared to the control.

The tomato genotypes studied (L-11/53, Monalbo, L-24/13 and AP-10) were subjected to an analysis of the variability of the main quantitative characteristics of the fruit (fruit weight, fruit height and diameter, shape index, pericarp thickness and soluble dry matter).The registered biometric data were statistically processed, calculating for each analyzed character the mean (x̄), the standard deviation (s), the coefficient of variability (s%), the range of variability (k = x̄ ± s) and the frequency of individuals in the range of variability (f%).The statistical analysis of the recorded data showed that the four tomato genotypes are uniform in terms of the variability of the main characters, the coefficient of variability having medium and low values for most of the analyzed characters, and represent a valuable material for the improvement of this species under conditions of thermal stress hydric from the area sandy soils.

Research into the cultivation of watermelons began many years ago. At the beginning, at RDSPCS Dăbuleni, the study of as many varieties and hybrids as possible was considered, in order to determine which ones find optimal conditions for growth and development on sandy soils and which meet the demands of the constantly changing market. Another important concern in the research activity at RDSPCS Dăbuleni was related to the obtaining of extra-early and early productions. In the traditional culture, established by direct sowing, mulching the soil with polyethylene ensured a production increase of 5.2 t/ha, 0.9 t/ha representing extra-early production, and in the seedling culture, by mulching the total production increased by 7.2 t/ha, and extra-early production increased by 2.3 t/ha compared to the non-mulched crop. Plant grafting, regardless of cultivar, rootstock and protection method, showed resistance to the attack of Fusarium oxysporum, even when crop rotation was not respected, but did not influence the attack of foliar pathogens (Alternaria cucumerina and Colletotrichum lagenarium).

The objective of this study is to present the behavior of 5 genotypes of garden beans: Ișalnița 43, Iuliana, Dabuleni Population (P1), Dabuleni Population (P2) and Ioana in the pedo-climatic conditions of the Dăbuleni area. The experiment is monofactorial and was located in the experimental field according to the method of randomized blocks in 3 repetitions. Cultivation technology specific to sandy soils was applied. Determinations were made regarding: number of pods per plant, length of pods, diameter of pods, average production achieve and phenological observations. The Ișalnița 43, P1, P2 genotypes stood out for their earliness, and the P1 genotype for the average production achieved. The weight of the pods varied between 15.59 g in the P2 genotype and 3.09 g in the Iuliana genotype.

In the context of climate change, the use of microalgae is an alternative to meet the requirements of agriculture, food and renewable energy. A major area of application is the use of microalgae as biofertilizers in agriculture. The aim of this paper is to study the influence of the application of Chlorella sorokiniana UTEX 1230 inoculum on the evolution of soil chemical composition, as well as the ability of microalgae, as a biofertilizer, on the growth and development of tomato plants, including the influence on plant physiological indices. Ground determinations, at 60 days after application of Chlorella sorokiniana UTEX 1230 inoculum indicated higher values of nitrogen, phosphorus, potassium and organic carbon content in the soil, The results regarding the growth and development of the plants obtained in the protected area (solar greenhouse), for the Romec 554j tomato variety showed differences between the variants studied. The Romec 554j tomato variety recorded a higher rate of photosynthesis in the version treated with the inoculum of Chlorella sorokiniana UTEX 1230, compared to the control version and the technologically fertilized version (12,66 µmol CO2 / m2 / s, compared to 11,82 µmol CO2 / m2 / s in the control version and 12,48 µmol CO2 / m2 / s in the technologically fertilized version), but the values were not statistically assured.