ARAÚJO, N. C.; http://lattes.cnpq.br/7850461835909726; ARAÚJO, Narcísio Cabral de.
Résumé:
Fertigation is the technique of application of fertilizers via irrigation water in agricultural
crops. This technique may be suitable for the application of alternative products, such as
yellow water and cassava wastewater, in corn and bean cultivars. In this context, the objective
of this research was to evaluate nutrient, growth and maize (Zea mays L.) and vigna bean
(Vigna unguiculata (L.) cultivars 'marataoã' fertirrigados with human urine associated with
the cassava wastewater. Two experiments were carried out in a greenhouse located at
Campina I, Federal University of Campina Grande, Campina Grande, PB. The first
experiment evaluated the effects of the fertirrigations with yellow water, cassava wastewater
and NPK with the vata Marataoã bean cultivar. Five treatments were applied in a completely
randomized design - DIC. Treatments consisted of fertigations with NPK (control), human
urine, cassava wastewater, more cassava wastewater human urine and more cassava
wastewater human urine plus phosphorus. The levels of nitrogen, phosphorus, potassium and
sulfur in the aerial part of the bean were evaluated; (Plant height, leaf diameter, leaf number,
leaf area, fresh and dry shoot mass), as well as yield (number of pods per plant, mean pod
length, number of grains per pod, mass Dry of 100 grains). The second experiment was the
fertirrigations with yellow water, cassava wastewater and NPK with 'Potiguar' corn cultivar.
Eight treatments characterized by cultivation without the application of fertilizers (control)
were studied; (PK), cassava wastewater plus NP and more cassava wastewater human urine
plus P. The leaf nitrogen, phosphorus, potassium and sulfur contents were analyzed and the
growth variables (Plant height, leaf diameter, number of leaves, leaf area, fresh and dry mass
of the leaves and stem), as well as yield (length and diameter of shrub spike, number of grain
rows per spike, number of grains per spike, mass Dry stalks with straws and debris). The data
of the studied variables were submitted to analysis of variance and the means were compared
by the Tukey test at the 5% probability level. The treatments that contained the effluents
positively influenced the macronutrient contents, the growth and production variables of
maize and vigna beans. The mean values of nitrogen, phosphorus and potassium were higher
than those for maize and vigna beans. The human urine and cassava wastewater applied by
fertirrigation have the potential to meet the demands of the main macronutrients required by
maize and vigna beans, which can substitute the nitrogen and potassium fertilization,
respectively, required by the crops studied, reducing relative production costs Purchase of
commercial fertilizers.