Uso da água do cultivo de microalgas na fertirrigação do coentro ( Coriandrum sativum L.) na região amazônica

Abstract

The cultivation of microalgae nowadays presents an exponential growth due to the search for new sustainable techniques where the use of biofertilizers seeks the reduction of pesticides, and thus resulting in the production of organic vegetables. Using water from microalgae cultivation in agriculture is one of the least explored alternatives. Thus, this work aimed to evaluate the production of coriander (Coriandrum sativum L.) crop fertigated with water from microalgae cultivation and different substrates. The experiment was carried out at the Sustainable Aquaculture Laboratory (LAQUIS) of the Federal Rural University of Amazonia - UFRA, Campus Belém-PA, and cultivated in 20 days. The design of the experiment was completely randomized, consisting of seven trays of 128 cells suspended in benches, divided into seven treatments, with 3 repetitions each (Figure 1). The substrates used in the experiment were: Coconut fiber, washed sand fiber (1:1) and humus from the decomposition of Mangueira (Mangifera indica) leaves and branches. Treatments were defined as follows: Treatment 1 (T1): Irrigated with well water and composite substrate; Treatment 2 (T2): Irrigated with microalgae water and coconut fiber substrate; Treatment 3 (T3): Irrigated with water from microalgae cultivation and composite substrate; Treatment 4 (T4): Irrigated with water from microalgae cultivation and coconut fiber substrate plus sand (1:1); Treatment 5 (T5): Irrigated with nutrient solution and composite substrate; Treatment 6 (T6): Irrigated with nutrient solution and coconut fiber substrate and Treatment 7 (T7): Irrigated with nutrient solution and coconut sand substrate (1:1). Treatment (T1) increased the root length of coriander plants, differing from the average root size in treatments T3 and T5. Treatments T3 and T5 had a higher fresh and dry biomass gain than T1, has been concluded that the cultivation of vegetables with fertigation of microalgae water is a beneficial alternative to the producer of protected areas in the Amazon.