Valentina COTET
The main objective of this study was to evaluate the mineral nutritional status of maize in relation with fertilization system. In this context, the paper presents the results obtained after the first year of research concerning the influence of fertilization on the content of macronutrients in maize. For the evaluation of mineral nutrition of maize, measurements of macronutrients have been carried out in the 3-5 leaves stage and plant harvesting stage, respectively. The application of manure and industrial fertilizers is intended to supply the needs of nutrients for plant in certain critical periods of their nutrition and therefore to increase the yields. The fertilization consisted in applying of different doses of fertilizers, on alluvial gleyic Solonchak from Traian - Braila. The experiment has been organized in vegetation pots (type Mitscherlich) with a capacity of 20 kg soil, the PR39D81 maize hybrid. Therefore, a trifactorial experiment A x B x C, in four repetitions has been established. The results were interpreted taking into account the optimal mineral nutrient limits for maize mentioned in the literature. Several conclusions regarding the influence of fertilizers applied to maize, based on interpretation of partial results for the experiment carried out in 2011, are as follows: for the first stage (the 3-5 leaves stage), the macro nutrients contents (% from dry matter) vary depending on the element analyzed as follows: N and P – poor to normal, K – normal to high, Ca and Mg – normal; in the second studied stage (maturity stage), the macro nutrients contents (% from dry matter) vary as follows: N, P and K – poor, Ca and Mg – normal. For a better analysis of the macronutrients contents in maize, on soils affected by salinization, the experiment is carried out in the same circumstances in 2012 also. In the process improvement of salt affected soil, a specific attention must be given in selecting salt tolerant crops according to the stage of the improvement process. It has to be noticed that in the first phase of improvement, the used crops include plants more tolerant to salts, while in the last phase of improvement, when soils become more fertile and with a lower salt content, it is possible to use crops less sensitive to salts, such as rapeseed, soybean, maize, etc.
macronutrients, maize, fertilizers system
Presentation: oral