Uso de regulador de crescimento na cultura do trigo e seus defeitos sob diferentes doses de nitrogênio

Abstract

Wheat is of paramount importance for human consumption, as is meeting the primary demand of power. In this sense, with the increasing population, one must think of new techniques that maximize the rational use of inputs and increase crop productivity, one of the latest techniques is the use of growth regulators associated with the use of higher doses of nitrogen, aimed at obtaining high yields per unit area. Thus this study aimed to verify the effects of trinexapac- ethyl growth regulator on wheat crop under different nitrogen levels. To this end, the experiment used 6 nitrogen levels ranging from 0, 33.75; 67.5; 101.25; 135; 168,75 kg ha-1 N, associated or not the application of trinexapac-ethyl growth retardant. Plant growth was evaluated as well as other productivity variables such as size of the spike, spikelets per spike, lodging index, length of between us, stem diameter, PH, thousand grain weight and productivity. The results of the experiment show that there was a reduction in the length between node 1, and consequently the height of plants and odging when the C was associated with the use of growth regulators. To the size of the variables spike, spikelets per spike and PH, there was no significant response from the increased nitrogen rates and growth regulator use. Productivity increases when it makes use of higher doses of N, but is not influenced by the use of growth regulator.