The development of the technology of maize production in Hungary depends largely on the genetic basis and the applied agrotechnology. Among the agrotechnical factors, the most powerful effect is provided by nutrient supply, modern and hybrid-specific plant nutrition. The experiment was carried out for three years in a small parcel set with three repetitions of double split parcels in Szarvas, at the Galambosi experimental site of the Faculty of Agricultural and Economic Sciences of Szent István University. In the experiment we examined the effect of three nutrients N, P and K, where the nutrients were released in three ascending stages. Nutrients, however, were not only tested on their own but in as many combinations as possible, so we can track the effect of each nutrient on each other. We measured the nutrients on a next levels, 4 nitrogens level (0 t/ha, 0,07 t/ha, 0,014 t/ha and 0,021 t/ha), 4 phosphoruses level (0 t/ha, 0,04 t/ha, 0,08 t/ha and 0,012 t/ha) and 4 potassiums level (0 t/ha, 0,06 t/ha, 0,012 t/ha and 0,018 t/ha). The gross, photosynthetically active size of the leaf area has a decisive influence on the size of the resulting crop, therefore, in our experiments, the leaf samples collected from the field experiments are sampled by our Eijkelkamp leaf area measuring device in the lab, and the quantified data are analyzed from several aspects. Samples are taken up to 50% of the leaf drying, so that we can track the rate and dynamics of leaf loss (drying) in stress. To measure the chlorophyll content of corn leaves, we use a portable Minolta SPAD photosynthetic pigment content meter. Using infrared light through the leaves, we can get quantifiable information (SPAD value). SPAD is a dimensionless number that can provide clear data for chlorophyll content in a letter. The result of the study is that there is a moderate positive correlation between the average yield , the relative chlorophyll content,and the leaf area, and the relationship being significant.

relative chlorophyll content, yield, leaf area, maize, long-term experiment

field crops and pastures

Presentation: poster