Dorotéia Alves Ferreira
Abstract:
Aimed to evaluate the effectiveness of a mycorrhization stimulating product (isoflavonoid formononetine) for soybean and corn crops in the southwest of Goiás Region (Jataí municipality) in different doses of soil phosphate. The experiment was conducted during two consecutive harvests (2010/2011 and 2011/2012 harvests) in the same experimental area. The experimental design was a randomized block design with 5 replications for the two crops studied in a dystroferric Red Latosol. The experimental arrangement used was a factorial with four doses of phosphorus (P), and for soybean the doses were: absence of application, 27, 40 and 80 kg of P2O5 ha-1 and the doses of formononetine (Myconate®) were: absence of application, 0.5; 0.9 and 1.8 g kg seed-1. The rates of P were: no application, 33, 50 and 100 kg of P2O5 ha-1 and formononetin (Myconate®) doses were: no application, 1.4; 2.8 and 5.6 g kg seed-1. The results showed that the natural mycorrhizal colonization of the cultures was already high in the initial phase of cultivation, causing no influence of the mycorrhization stimulant. The soybean and corn plants in the present study did not present nutritional or environmental deficiencies in the cultivation conditions studied. Thus, there was no ositive effect on the use of the product formulated with the isoflavonoid formononetine. Therefore the application of formononetin wasn't able to promote increase in grain yield for soybean and corn crops, due to the good cultivation conditions of the region that favors high yields and did not impose stress on the crops.
