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Abstract
The present work aimed to analyze the effects of the application of dilutions of treated gray water (TGW) in well water (WW) on growth and production of millet cv. Ceará (Pennisetum glaucum). The experiment was carried out in a greenhouse, on the department of agronomic and forestry sciences, at the Federal Rural University of the Semi-Arid (UFERSA), Mossoró, RN, Brazil. The experimental design was randomized blocks with five treatments and six replications, totaling thirty plots. The experiment was carried out in vases with volume of 25L containing four plants per vase. The treatments consisted in five dilutions of TGW in WW: T1—100% WW plus 0% TGW; T2—75% WW plus 25% TGW; T3—50% WW plus 50% TGW; T4—25% WW plus 75% TGW and T5—0% WW plus 100% TGW. During the experiment it was analyzed the attributes of plant height, number of tillers, number of leaves, stem diameter and total fresh and dry matters. With the results, it was observed that the exclusive irrigation with TGW (T5) promoted better millet development. As the concentrations of TGW increased in dilutions, also increased plant height, number of leaves and tillers. The rise in the number of leaves is associated to the rise in height and tillers, and those are associated to the rise in stem diameter and fresh matter, resulting in better accumulations of dry matter and showing the viability of gray water use to improve forage production and increasing potable water availability to multiple uses.
Highlights
The way to increase availability of sources of water to irrigation is to rationalize its use (Santos Júnior et al, 2013), as well as to reuse water from different activities (Medeiros et al, 2010)
Considering that treatments T4 and T5 received higher volumes of treated gray water, there was economy of 75 and 100% of well water for forage production, higher than forage production of treatment T1, that only used well water
The better treatment was the one with 100% of treated gray water (TGW) (T1), which presented average height of 112.87 cm while treatment T1 presented average height of 92.04 cm (Figure 2A)
Summary
The way to increase availability of sources of water to irrigation is to rationalize its use (Santos Júnior et al, 2013), as well as to reuse water from different activities (Medeiros et al, 2010). Beyond preventing water sources eutrophication, this technic when used correctly can improve food production because it has nutrients that allow to substitute in part or totally mineral fertilization to cultures, promoting benefits both economic and environmental. A study carried out in Campinas, SP, with treated domestic wastewater proved that its use promotes water and nutrients to fertilize soil and improve mays productivity (Javarez Júnior et al, 2010). Another study carried out in Apodi, RN, shown that treated domestic wastewater use to irrigate red rice promoted rise on some nutrients tax, such as nitrogen (Brito et al, 2014)
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