Evaluation of Vigna unguiculata vegetation growth under organic and chemical fertilization applications
DOI:
https://doi.org/10.6008/CBPC2318-2881.2021.004.0011Keywords:
Fertilizer, Fertilization, Vegetative growth, CompostAbstract
Cowpea (Vignaunguiculata (L.) Walp.) is one of the most important and strategic food sources for the tropical and subtropical regions of the planet. Most of the Brazilian production of cowpea in the North and Northeast regions is made in consortia with other crops, such as cassava and corn, in addition to perennial crops. The objective of this work was to evaluate the vegetative growth of cowpea under different sources of organic fertilization and relate it to chemical fertilization. The experiment was carried out in a greenhouse located at the Instituto de Ciências Agrárias, area of soil science, Federal Rural University of Amazônia – UFRA, in the municipality of Belém, Pará. The soil used in the experiment was collected in the layer from 0 to 20 cm, in an area ofsecondary forest with more than 20 years without agricultural activities, within the university area. The soil was incubated for a period of 30 days to reduce acidity, using dolomitic limestone. After the reaction of limestone in the soil, 3 seeds were introduced per pot, with a capacity for 3 dm³ of soil, of the pretinho variety. The beginning of germination occurred on the third day after sowing, and on the tenth day, the thinning was done, leaving only one plant per pot. The design used in the experiment was completely randomized distributed in 5 replications, with the following treatments: soil + chemical fertilization; soil + chemical fertilization + limestone; soil + sheep dung; soil + organic compost; soil + poultry litter; soil + chemical fertilization + sheep manure; soil + chemical fertilization + poultry litter; soil + chemical fertilization + organic compost; soil + limestone. Distributed on two benches and totaling 45 experimental units. The stem height, stem diameter, number of leaves, shoot green mass, shoot dry mass, branch green mass, branch dry mass, root green mass, and the dry mass of the roots. Of the variables analyzed, the treatments with chemical fertilization plus sheep manure obtained the best results, followed by fertilization with organic compost and fertilization with poultry litter. Fertilization, according to the concentrations used, have positive effects on the vegetative part of the cowpea crop.
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