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The paper purpose was to assess the impact of climate change on wheat, maize and sunflower yield in the period 2017-2021, using statistical data from National Institute of Statistics (NIS) and National Administration of Meteorology (NAM) and other sources. Comparison method was used to evaluate the deviations between the registered air temperatures and precipitations and the 1981-2010 climatological norm. Graphic method reflected the dynamics of monthly air temperatures and rainfalls in each year. Descriptive statistics for mean, standard deviation and coefficient of variation reflected an more comprehensive image upon air temperature, precipitations and yield. Correlations and regression equations were used to establish the intensity of the kinks between climate factors and yield. The highest average air temperature In Romania was 12.130C in 2019. In the period 2017-2020, the average annual temperatures exceeded the climatological norm 1981-2010 accounting for 9.10C. The lowest rainfalls, 614.2 mm, were recorded in 2019, being below of 633.1 mm the norm for the period 1981-2010. The high temperatures associated with drought and low precipitations have deeply affected yield of many agricultural crops, including maize, wheat and sunflower. The highest wheat yield 4,888 kg/ha was achieved in 2017, and the lowest one, 2,966 kg/ha in 2020. Maize registered the highest performance of 7,644 kg/ha in 2018, and the lowest one, 3,977 kg/ha in 2020. Sunflower carried out the high performance 3,041 kg/ha in 2018, and the lowest one, 1,858 kg/ha in 2020. The worst agricultural years for these three crops was 2020, but 2017 favored wheat, while 2018 favored maize and sunflower. The correlation coefficient had in general small values between average temperature and yield, but a higher link with precipitations level. The multiple correlation between yield, air temperatures and precipitations was: r= 0.817 for wheat, r = 0.116 for maize and r = 0.504 for sunflower. In the South Eastern Dobrogea, the driest area in Romania, the rainfalls declined by 65% in the period 2018-2020 having a deep negative impact on sunflower seeds yield, which decreased from 4,282 kg/ha in 2018, to 1,503 kg/ha in 2020. The correlation between precipitations and sunflower yield positive and very strong (r = 0.737). As a conclusion, the climate conditions should be analyzed in each farm and farmers have to take measure to adapt the technologies for sustaining production. [ABSTRACT FROM AUTHOR]

The article examines the prospects of Ukraine on the world grain market and ways to increase the efficiency of maize cultivation using environmentally safe technologies in the conditions of the negative impact of climate change and other stress factors. The methodological approach takes into account the peculiarities of agrarian production based on the use of data of the Food and Agriculture Organization of the United Nations, United States Department of Agriculture, United Nations, Ministry of Agrarian Policy and Food of Ukraine and State Statistics Service of Ukraine. The dynamics of world production and export of maize grain, sown areas, production and yield of maize in Ukraine are demonstrated, which directly focuses attention on the competitiveness of Ukrainian maize on the world grain market. These arguments are confirmed by analytical results, which show that in 2022, among the world leaders of maize grain producers, Ukraine took fifth place, and among exporters - fourth. In order to mitigate the impact of climate change and other stress factors on the effective production and export of Ukrainian maize, adaptation measures are proposed, which consist in the application of modern technologies, which include: optimization of the structure of sown areas and scientifically based crop rotations with the effective use of competitive varieties and hybrids of agricultural crops, the introduction of organic and mineral fertilizers and plant protection products, the use of soil protective tillage, sideration and mulching, irrigation systems, and also the productive use of plant residues with the application of modern biodestructors. Their comprehensive implementation will contribute to the development of maize yield, grain quality, preservation of biodiversity and the solution of the grain-food problem in the world. [ABSTRACT FROM AUTHOR]

The yield of a crop is dependent on the interaction of biotic and abiotic factors, the most important being the pedoclimatic conditions and the attack of diseases and pests. The aim of this paper is to evaluate the impact of the interaction of biotic and abiotic factors on the yield of the Turda 332 maize hybrid in the period 2018-2020. A multifactorial experiment was organized, with the following graduations: factor A - climatic conditions in the experimental years (2018-2019-2020), factor B - tillage system (conventional, minimum tillage with chisel, minimum tillage with disc, no-tillage), factor C - foliar fertilizers (different grades of mineral fertilization with macro and microelements). The obtained results indicate that the way of processing the soil has an influence on the water reserve in the soil and on the yield elements, but the biggest impact has the environmental conditions, in 2018 and 2020, favorable years for maize cultivation, the yield was 8971 kg/ha respectively 8578 kg/ha, and in 2019, a less favorable year, the yield was 5581 kg/ha. The frequency and intensity of the attack of diseases and pests are influenced by the variation of climatic conditions, in 2018 and 2020 registering the highest frequency of attack, the tillage system as well by the level of fertilization, in the variants with foliar fertilization registering the lowest attack. [ABSTRACT FROM AUTHOR]

Maize is a staple food worldwide, and the issues of growing it in current drought-oriented scenario of climate change rise challenges in agricultural practices, especially for the rainfed agriculture that is widely extended in Romania. The current paper presents the results of a field research conducted during 2017 and 2018 at Moara Domnească Didactic Farm, located in Southeastern Romania, aiming to highlight the influence of technological factors, as fertilization and hybrid, on maize yield recorded in rainfed conditions. Rainfalls capitalization by the maize crop shows yield increases between 25.2 kg and 37.8 kg grains per mm rainfalls, depending on hybrid and fertilization rates. The highest yield is recorded by the hybrid DKC 5086 (8512,7 kg/ha) at the fertilization level N80P40. Yield growth generated by mineral fertilization recorded an average value for the researched hybrids of 14.1 kg per kg of nitrogen applied and of 9.1 kg per kg of phosphorus. [ABSTRACT FROM AUTHOR]

Yield and quality are affected by several plant characters, environment and cultural practices. The researches were performed during the 2018-2020, in the experimental field of NARDI Fundulea and the aim of this study was to evaluate the effect of sowing date, plant density and climatic conditions on the yield and quality of maize. The experience comprised three different sowing dates (I - April 1, II - April 15 and III- May 1), using three maize hybrids (Iezer, Mostistea and F423) and three plant density (50 000, 60 000 and 70 000 plants/per hectare). The annual rainfall varied from year to year and the maximum production and quality of maize was maximized from medium plant density and earlier sowing dates, depending on the hybrid. The early sowing date led to increase of quality values, which was depending on climatic conditions. The results showed that yield and quality from maize was very significantly affected by year conditions, sowing date, plant density and hybrids, as well as by most interactions between these factors. [ABSTRACT FROM AUTHOR]

One of the consequences of climate change in Sub-Saharan Africa is that farmers would be more exposed to production risk. Therefore, it is imperative to analyse the climate-related risk and maize production in Southwest, Nigeria. Secondary data between 1981 and 2012 were collected on relevant variables and analysed using Growth Function, Co-integration Model (Autoregressive Distributed Lag Approach) and J-P Model. The results confirmed the presence of long-run equilibrium between maize production and temperature, rainfall and relative humidity. The Error Correction Model (ECM) value was -0.0238 for the enterprise. The results of the analysis on the climaterelated risk indicated that temperature increased the production risk of maize farmers. It can be concluded that farmers face climate-related risk as temperature increased the production risk of maize farmers. Therefore, stakeholders should create more awareness on the need to always practice eco-friendly activities and put in place coping strategies against the menace of climate change. [ABSTRACT FROM AUTHOR]