Constantin Toader, Marilena MĂRGHITAŞ, Mihaela MIHAI, M. ŞANDOR
Maize is considered to be a plant exhibiting significant nutient consumption, thus responding to the application of fetilization systems that make eadily available significant element amounts in the soil or applied by means divesified nutrient vaieties. It has been previously proven expeimentally that on a regula basis, the maize crop significantly responds to a multitude of fetilizing combinations, with an organic and mineral substatum, where esential nutritive elements reside, especially those with a high specific and global consumption in maize. The research undertaken in the field of differentiated fertilization in maize crop aim at rationalizing fertilizing mineral inputs and at their reduction by promoting alternatives and strategies for an efficient inclusion within differentiated fertilization systems of humiferous organic resources and plant residues. In order to achieve the aforementioned research objectives, field experiments were conducted in 2009 at SDE Cojocna of the University of Agricultural Sciences and Veterinary Medicine Cluj-Napoca, on a cambic chernozem soil, on maize crop including different fertilizing sources, mineral- from complex NP fertilizers, organic- from semi-fermented stable manure and residual mushroom compost.The present paper presents analytical and experimental results obtained through the application of differentiated doses of fertilizers on maize crop, both mineral (from complex NP fertilizers) and organo-mineral (semi-fermented stable manure, residual mushroom compost and complex mineran NP fertilizers).The differentiated application of fertilizers reveals the importance of combinations such as the organo-mineral one with stable manure as an organic support, as well as that including residual compost, where the grain production significantly increases as compared to the control variant (unfertilized) and tne exclusively mineral fertilized one. In the same context, agrochemical soil indices and nutrient accumulations in maize grains are positively influenced in organo-mineral fertilizations. As far as the exclusively mineral fertilization is cocnerned, one can observe a slight acidification of the soil, as fertilizer doses are increased. The capitalization of production and analytical data in time, in the context of multiannual application of different fertilizer combinations will certainly lead to relevant, as well as impotant intepretations for agricultural pactice. These data support integated fertilization technologies for agicultural crops and determine decisions for the sustainable management of soil fertility. In addition, production quality modifications that are assessed on a periodical and an annual basis, as well as interpreted in connection with the multiannual changes of the relevant indices of soil fetility, may provide the foundation fo the safety of plant and food production. In this context, the drafting of agrochemical nomograms for differentiated fertilization systems are of the utmost scientific importance and may stir agricultural practice towards the differentiated application of fertilization.The paper was supported through the project: POSTDOCTORAL SCHOOL IN THE FIELD OF AGICULTURE AND VETERINARY MEDICINE Contract n.: POSDRU/89/1.5/S/62371.
productions, nutrients, fertilizers, maize grains
Presentation: oral