CRESCIMENTO DE GIRASSOL EM SUBSTRATOS DE CASCA DE ARROZ CARBONIZADA.

Abstract

The objective of this experiment was to evaluate the effect of nitrogen doses, associated with charred and ground rice husk on the growth of sunflower seedlings. The experimental design was a randomized block design in a 2 x 4 factorial arrangement, with two types of rice bark (carbonized and milled) and four nitrogen doses (0, 30, 60, and 90 kg ha-1) Repetitions. Sunflower seeds were planted in 5 L plastic pots. At 90 days after sowing, the following variables were evaluated: a) Number of seeds per chapter; B) Weight of 100 seeds; C) Weight of the seeds of each chapter; (D) mass of the dry matter of the chapter with seeds; (E) the dry matter mass of the seed-free chapter; (F) mass of the green matter of the chapter with seeds; G) Mass of green matter and dry root; H) Mass of stem green matter; (I) mass of the dry matter of the stem; J) mass of the green matter of leaves; L) Dry matter mass of the leaves. Data were submitted to analysis of variance and regression. It was concluded that for the mass of the dry matter of the seeded section the nitrogen dosages and the carbonized bark had a good success, however for green and dry weight of the stem the nitrogen dosages did not stand out for fertilization already using the bark that had A significant effect was the charred shell. For the Seed Numbers of the chapter, Weight of 100 seeds, Dry matter of the Chapter without Seeds, Mass of the green matter of the chapter with seeds, Mass of the green matter of the root, Mass of the dry matter of the root, Mass of the green matter of the Leaves, dry matter mass of the leaves, weight of the seeds of each chapter did not have significant effect for the doses of important nitrogen in the vegetative phase as well as for the fertilization using the carbonized and ground bark.