Pressões sobre as linhas de semeadura do algodoeiro influenciando a emergência e o crescimento inicial

Abstract

The sowing process is of fundamental importance for the establishment of the crop in the field, so attention should be paid to the force that is applied on the seeding unit, which influence the delay of emergence of cotton seedlings, This delay can later cause a decrease in the development and productive potential of the plant. Thus, this work aimed to evaluate the different pressures exerted on the lines of planting, emergence and development of cotton. A randomized block design with eight treatments and three replications was used, totaling 24 plots. The treatments consisted of pressures, manual 16 kg, 45 kg and 120 kg, automatic light, standard and heavy, automatic customized 36 kg and 59 kg, where each seeding unit had a DeltaForce hydraulic pressure mechanism from Precision Planting. Seedling emergence was evaluated on the 5th, 6th, 7th and 8th day after sowing, total number of plants emerged on the 8th day, number of seeds exposed, height of plants with 20 and 25 days after sowing and main root length with 15 days after sowing. The automatic pressure systems did not influence the seedling emergence, only the manual pressure system had an influence. There was no difference in plant height 25 days after sowing and root length 15 days after sowing, in relation to the different pressure systems used.