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Terceiro Neto C.P.C.,Extencionista da EMATER PB | Medeiros J.F.,Rural University | Gheyi H.R.,Nucleo de Engineering de Agua e Solo | Dias N.S.,Rural University
IRRIGA | Year: 2014

Rio Grande do Norte state is the second largest exporter of melons in Brazil, and the scarcity of water of good quality has limited the expansion of irrigated areas in the Mossoró region, in which the major part of their production is concentrated. However, the high availability of saline water of low cost could be feasible if appropriate management was carried out. The objective of the study was to evaluate the effects of low and high salt concentrations in water, applied on an alternate basis, on growth and mineral composition of leaf tissue of melon plant. The experiment was conducted in Pedra Preta farm, Mossoró city, RN. Melon plants (Cucumis melo L., cv Sancho) were irrigated with low (CEa = 0.5 dS m-1) and high (ECw = 4.3 dS m-1) salinity water applied daily, on an alternate basis, according to the growth stage or with no crop alterations, totaling 10 treatments. Randomized blocks with four replications were used in the experimental design. The management strategies had no effect on dry phytomass accumulation in melon plants. The increased uptake of K by the melon tissue contributed to a high K/Na ratio in the shoots, which confirms the salinity tolerance of this cultivar.

Guedes Filho D.H.,Federal University of Campina Grande | dos Santos J.B.,Federal University of Campina Grande | Gheyi H.R.,Nucleo de Engineering de Agua e Solo | Cavalcante L.F.,Federal University of Paraiba | Santos Junior J.A.,Federal Rural University of Pernambuco
IRRIGA | Year: 2015

The use of brackish water in irrigation and soil fertilization with nitrogen has contributed to the expansion of sunflower cultivation. In this context, the components of production and yield of sunflower plants (Helianthus annuus L.) cv. EMBRAPA 122/v-2000 were evaluated under different water salinity levels (ECw) and Nitrogen doses. The experiment was conducted at the municipality of Remígio, Paraíba from November 2011 to February 2012. Treatments were allocated in randomized blocks in a split-plot and factorial (5 x 4) design. Levels of saline irrigation water – Ecw 0.15; 1.5; 2.5; 3.5 and 4.5 dS m-1 were the plots and doses of Nitrogen 40; 60; 80 and 100 kg ha-1 were the subplots with three replicates and 30 plants per plot. The productivity in achenes, oil yield, dry and fresh biomass of the chapter of sunflower decreased linearly with water salinity and increased linearly with Nitrogen doses. Dry matter of the chapter without achenes suffered no influence from doses of Nitrogen, but it was affected by increasing water salinity levels. A significant effect of interaction between water salinity levels and Nitrogen doses was found on the diameter of the chapter and drymass of chapter with achenes. A negative linear effect of water salinity levels and positive linear effect of doses of Nitrogen fertilization were observed on both variables. © 2015, Universidade Estadual Paulista - UNESP. All rights Reserved.

de Sousa C.H.C.,Federal University of Ceara | de Lacerda C.F.,Federal University of Ceara | da Silva F.L.B.,Federal University of Ceara | Neves A.L.R.,Federal University of Ceara | And 2 more authors.
Engenharia Agricola | Year: 2014

The objective of this study was to evaluate the use of subsoiling, gypsum and organic matter associated with the cultivation of cotton, sunflower and cowpea in crop rotation, seeking the reclamation and use of a saline-sodic soil. The treatments were arranged in a randomized block design in split plots with four replications, during two crop cycles (2009/2010 and 2010/2011). The plots were formed by the treatments: T1. Subsoiling (S); T2. S + 20 Mg ha-1 of gypsum T3. S + 40 Mg ha-1 of organic matter; T4. S + 10 Mg ha-1 of gypsum + 20 Mg ha-1 of organic matter; T5. S + 20 Mg ha-1 of gypsum + 40 Mg ha-1 of organic matter and the sub-plots consisted of the cotton-cowpea (C/CP) and sunflower-cowpea (S/CP) crop rotation. The use of gypsum and organic matter contributed to decrease the soil salinity and sodicity. Cotton was not affected by the treatments, while the sunflower crop was favored by the application of amendments only in the second production cycle. Higher yields of cowpea in T5 treatment, during the 2009/2010 cycle, are indicative that higher doses of gypsum and organic matter applied in this treatment accelerate the reclamation process. For other treatments with amendment application there was a beneficial effect for this crop only in the second cycle, when the values of productivity were similar to T5.

Santos Junior J.A.,Federal Rural University of Pernambuco | Gheyi H.R.,Nucleo de Engineering de Agua e Solo | Cavalcante A.R.,UFRB | Dias N.S.,UFERSA | Medeiros S.S.,Nucleo de Recursos Hidricos
Engenharia Agricola | Year: 2016

In view of the specific characteristics regarding infrastructure, soil, climate, hydrology and social conditions of the Brazilian semi-arid, it is of paramount importance the use of alternative cropping systems, which take into account such features, as well as considering local water quality. In this sense, our study aimed to evaluate saline stress effects on sunflower production and post-harvest which are grown in an alternative low-cost hydroponics. Experimental design consisted of completely randomized blocks in 4 × 3 factorial scheme, with three replications. Treatments assessed the effect four salinity levels in hydroponics nutrient solution (1.7 - control, 4.3, 6.0, and 9.0 dS m-1) on crop production of three sunflower cultivars ('Sol Noturno', 'Bonito de Outono', and 'Anão de Jardim'). Our results showed that even at a maximum salinity level in nutrient solution (9 dS m-1), number of petals postharvest life remained within commercial standards for both 'Sol Noturno' and 'Anão de Jardim' cultivars.

Santos O.S.N.,Nucleo de Engineering de Agua e Solo | Teixeira M.B.,UFRB
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

In this study the growth and nutritional status of helicônias irrigated with treated wastewater of domestic origin associated with chemical fertilizers (NPK) was studied. The experiment was conducted in a greenhouse utilizing plants of helicônia Golden Adrian. The experiment was installed in 5 x 3 + 1 factorial scheme consisting of five depths of irrigation water (equivalent to 60, 80, 100, 120 and 140% of class A pan evaporation - ECA), three types of water (wastewater (AR), rainwater (AP) and a mixture of 50% AR + 50% AP) and control (soil without fertilizer and receiving rainwater corresponding to 100% ECA). The experimental design was in randomized blocks with five repetitions. The use of AR and larger depths of irrigation provided increases in evaluated parameters of growth. The levels of macronutrients in the leaves of plants irrigated with AR were similar to plants that received AP. The use of AR and AP resulted in increases in the content of micronutrients in leaves, especially Fe and Mn, above the levels recommended for the crop.

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