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One of the most important food resources for humans, as well as animals, is the corn. By knowing the control mechanisms for certain corn plant characteristics and traits, new hybrids were created, whose genetic base insures a higher productivity capacity, as well as higher quality traits, genetically resistant to the attack of some pests or other pathogenic agents. A special important role in the corn crop is attributed to zoning and micro-zoning proper for the hybrids, as well as the cultivation technology. Although the importance of crop rotation and cropping system are known, progress in the weed control and fertilization field, and the scientific research carried out in our country determined the authors to test the manifestation of productive potential in some corn hybrids, under monoculture conditions. Two corn hybrids pertaining to the FAO 300-400 maturity group were selected for the study, on a typical chernozem from the Slobozia locality area, in the Ialomita county. Monoculture advantages, allowing for farmer specialization in a single culture and the use of a proper machine set to do so, have encouraged many corn cultivators from America, Canada and, later on, Europe to practice this system. In the experimental year 2014, under agro-pedological-climatic conditions from Baragan Plain, localty Slobozia, farm I.I. Vişan Daniela Elena, hybrid Bonito registered on average 300 g the weight of kernels from the cob and hybrid NK Cobalt had the weight kernels from the cob of 360 g. After laboratory analysis, the weight of 1,000 kernels at hybrid Bonito was 337 g, and at hybrid NK Cobalt was registered the value of 348 g for the weight of 1,000 kernels. In the experimentation year 2014, hybrid Bonito registered a yield of 9,000 kg/ha, while the hybrid NK Cobalt obtained a yield of 8,500 kg/ha, both cultivated under non-irrigated regime, in the agro-pedological-climate conditions of Baragan Plain, locality Slobozia, the farm I.I. Vişan Daniela Elena. Still, long term research has shown that practicing a monoculture for a several years has unfavourable effects on soil characteristics as well as on production. [ABSTRACT FROM AUTHOR]

Computers have become to play an important role in people's lives throughout the world thus increasing the number of patients with ocular complaints. Also known as computer vision syndrome, accommodative asthenopia might be considered as a neglected occupational condition, but there is no consensus regarding diagnostic criteria, which leads to under-recognition and under-reporting. The aim of the study was to investigate the prevalence, early symptoms and specific preventive measures of accommodative asthenopia among computer-using medical students ( n  = 420), in a cross-sectional study. The most common early symptoms were: tired eyes/eye strain (86.1%), burning eyes (46.8%), migraines/headaches (46.8%), red-swollen eyes (43%), photophobia (41.8%), temporary blurred vision (35.4%), and eyelid spasms (32.9%). Our study identifies the most frequent early symptoms of accommodative asthenopia as a possible occupational disease, which might serve as a fundament for a future consensus strategy.