Avaliação da influência da adubação foliar à base de água de xisto, através de técnicas de sensoriamento remoto, na cultura do milho

Abstract

The objective of the present work was to evaluate the efficiency of shale-based foliar fertilization, and the correlation between morphological aspects and chlorophyll contents with the Green Leaf Index (GLI). The experiment was realized at the Hermann Family estate, which has a history of eight years of direct planting with annual crops, predominantly soybean, corn, beans and oats. Located in the city of Foz do Jordão, in the Southwest of Paraná state. The plots were subjected to the following treatments with biostimulant produced with shale water: (T1) Control; (T2) 1L ha1; (T3) 2,5 L ha1; (T4) 4 L ha1. The treatments were divided into blocks and the collection points were randomized for each experimental unit, with eight collections of information being made in each of them, and then an arithmetic mean between the values. In the development stages V6, V10, V14 and R1, height, stem diameter, green leaf index and chlorophyll meter measurements were performed. For each evaluation, the means of the treatments were submitted to the Tukey test of comparison of averages, testing if there was a significant difference between the treatments. On top of all the variables, a Pearson Correlation test was run, where it was possible to observe which data correlated. For the data that showed to be correlated with each other, a linear regression graph was adjusted, being thus possible to observe how, and at what level, the correlation between the variables occurred. The highest productivity was observed in the treatment of 4 L ha-1, followed by the lower treatments. The GLI was more promising when the flight was carried out in the transition from the vegetative phase to the reproductive phase (development stage R1). Showing positive correlation with the data of: productivity, plant height and stem diameter.