Protetor solar, extrato de alga e substâncias húmicas no crescimento inicial de plantas de café em campo

Abstract

: Brazil is the world's largest producer and exporter of coffee, which is grown in the most different environments in the country, subject to different stress conditions, which can lead to losses in plant growth and grain productivity. In this sense, the use of sunscreen and biostimulants can be an alternative to minimize these impacts. Thus, the objective of the work was to evaluate the effects of sunscreen and biostimulants based on algae extract and humic substances on the initial growth of Arabica coffee seedlings. The experiment was carried out in the field, in the experimental area of the Federal University of Mato Grosso do Sul, Chapadão do Sul Campus. A randomized block design was used with seven treatments and four replications. The treatments consisted of: control, sunscreen (PS), Ascophyllum nodosum algae extract (EA), humic substance (SH), PS + EA, PS + SH and EA + SH. Assessments were made of plant height (ALT), stem diameter (DC), relative chlorophyll index (IRC), stem height/diameter ratio (RHDC), absolute diameter growth rate (TCD). The seaweed extract was only favorable for plant height growth. Sunscreen and humic substances favored the relative chlorophyll index, height/diameter ratio and absolute diameter growth rate. Only humic substances increased the stem diameter of coffee plants.