Efeito do bioestimulante stimulate® em diferentes doses na produtividade total de milho (Zea mays)

Abstract

Corn is one of the oldest cereal cultivated in the world, wich has a great economic importance. It has a great yield potential and high nutritional value. Furthermore it is one of the main inputs by the fabrication of animal feed and products such as pasta, cookies, breads and more. To increase the productivity, farmers have been using products such as biostimulants that contains auxin, cytokinin and gibberellin. Auxin causes growth, stem elongation and apical dominance. On the other hand cytokinin acts on cell division, nutrients mobilization, photosynthesis and root growth, and the gibberellin works on cell elongation and division, stem growth and development of fruit and seed. The objective of this study was to evaluate the efficiency of biostimulant Stimulate® in the total corn yield. The experiment was conducted in the experimental area of UTFPR - campus Pato Branco - PR, in the crop years 2010/2011, 2011/2012 and 2012/2013. The cultivar corn AG 8041YG where subjected to five treatments: 0ml, 125ml , 250ml, 375ml and 500ml per hectare as seed treatment. The total yield, weight of thousand grain and the number of rows per ear were evaluated. The experimental design was a randomized block with four repeats. The sowing was manually, adjusting plant population by thinning on 70000 plants per hectare. Weeds were controlled. The basis fertilization was made with 400 kg per hectare on the formulation of 08-20-20 NPK, and the nitrogen fertilization was divided in two parts according to formulation 33-00-00 NPK + S + 15, where 200kg.ha-1 were applied on basis and 200kg.ha-1 were covered 20 days after sowing. 5 rows in each plot were planted and only the three central lines were harvested. The grains were separated by beater and then weighed. The grain moisture was adjusted to 14% humidity. The number of rows per ear and the thousand grain weight were counted. The results indicate that there was no statistical difference in the total productivity, number of rows per ear and thousand grain weight. It was observed an increase production on the total productivity of 747 kilograms per hectare for the treatment 250ml ha-1 in relation to dose 0. An increase in productivity was observed in plots that received treatment compared with those which didn't. That can indicate that there was probably an increase of roots and better absorption and use of the nutrients from the soil.