This assay was conducted at the Department of Animal Science da Universidade Federal Rural do Semiárido- UFERSA/RN. With the objective to evaluate the effects of the addition of growing levels of jitirana (Merremia aegyptia L.) in the nutritive value of the elephantgrass silage (Pennisetum purpureum Schum). The experimental design used was the completely randomizes with six treatments and three replicates. The treatments consited of corn silage with 0,10,20,30,40 and 50% of jitirana forage. The material remained ensiled for 65 days in experimental silos plastic sacks. And the contents of MS, PB, EE, RM, MO and crude energy (EB) were determined. The increase in the ratio of jitirana resulted into a positive linear effect on the values of PB, RM, EE and EB, and a negative effect on the contents of MS and MO. The addition of up to 50 % of jitirana forage in the mixture of the silage is a viable alternative to the improvement of the nutritive value of Sorghum silage.

The experiment was carried out to evaluate the nutrients content in leaves of lettuce intercropped with carrot in strip-intercropping under different planting densities of component crops. The experimental design used was of randomized complete blocks in a 4 x 4 factorial scheme with three replications. The treatments consisted of the combination of four lettuce-planting densities (40%, 60%, 80% and 100% of the recommended sole crop density - RSCD) with four carrot-planting densities (40%, 60%, 80% and 100% of the RSCD). Evaluations for P, Na, Ca, Mg, and K contents were made in the lettuce leaves. There was a significant interaction between lettucedensities and carrot-densities on P content in lettuce leaves. Higher contents of Na and Ca (58.40 and 7.58 mg/plant) were observed in the lettuce-densities of 52% and 47% of the RSCD. The contents of Na and K held constant with increasing carrot-densities. Higher contents of Mg (30 and 15 mg/plant) were observed in the density of 40% of the RSCD both in lettuce and carrot crop.

During the germination process, the impermeability of the tegument and the humidity of the substratum they influence the reidratação of the seeds, metabolic activation and consequent growth of your embryonic axis. Therefore, the present work was led with the objective of evaluating the effect of the removal of the tegument in the germination and vigor of seeds of pinhão-tame (Jatropha curcas L.) in different volumes of water in the substratum. After the seed shoud treatments they were installed in germination model Mandelsdorf under regime of natural light in the constant temperature of 30ºC. The experiment was set up in a completely randomized factorial design outline 2 x 4 (2 - with and without tegument and 4 - humidities 2,0; 2,5; 3,0 and 3,5 times the weight of the paper (g).). The evaluations were accomplished daily (primary roots protrusion) and to the 07 and 10 days of the beginning of the test, being computed the normal seedlings. In agreement with the results obtained in the present work, the retreat of the tegument can be ended it affects the germination and vigor of the seeds negatively, that the when the substratum is humidified with volume of water (mL) in the strip from 2,0 to 2,5 times the weight of the paper, happening the reduction of the germination and vigor when the substratum is humidified for superior values to this. Presenting better acting when the substratum is humidified with volumes of water (mL) equivalent to 3,0 and 3,5 times the weight of paper germitest (g), happening the reduction of the germination and vigor when the substratum is humidified for inferior values to these.

The study was carried out greenhouse of the Department of Forestry of the Federal University of Paraíba, Patos, PB. Are am of this study to evaluate the effect of the inoculation with native rhizobia and/or arbuscular mycorrhizal fungi (AMF) of the initial growth of red-angico (Anadenanthera macrocarpa Benth. Bren.), a legume native tree of the great socio-economic and ecological importance in the semi-arid of the Brazilian northeast. The plants grew for 120 days in pots with 4.0 dm3 with a mixture by sand and clay (1:2, v/v). The five treatments consisted: inoculation of AM fungi (Glomus etunicatum Becker & Gerdmann) and/or native rhizobia (NR), previously selected; addition of N (100 mg dm-3) and a control (without N and inoculation). All treatments were significantly higher than the control for seedling height and shoot dry weight, mainly in the treatment with fungi inoculation. Inoculation treatments were able to supply the nutrients (N and P) for growth of A. macrocarpa seedlings ultil 120-days old.

With the purpose of to evaluate the milk composition of cows fed with sugar cane whose crude protein had been corrected with soybean meal and different urea levels and ammonia sulphate, twelve dairy Holstein pure breed and crossbreed cows maintained in tie stall fed ad libitum twice a day had been used. The forage:concentrated relationship at the beginning of experiment was 55:45%, corresponding 1kg of intent ration for each 2kg of milk produced. The animals were distributed in three Latin squares 4x4, according to lactation period. The duration of each period was 17 days, being the first 10 days of adaptation and seven days to data collection. The experiment was composed of four treatments: sugar-cane with soy bean meal and sugar-cane with 0.4; 0.8 and 1.2% of the mixture urea and ammonia sulphate (9:1). No difference was found among the diets for milk production with and without correction to 3.5% fat, neither for milk composition and serum urea nitrogen (SUN) when the diet with soy meal based concentrate was compared with the diets with different urea levels. The soy meal can be used for protein correction the sugar-cane. For correction using the mixture urea and ammonia sulfate (9:1) the level of 1.2% is recommended.

The culture of the popcorn comes as a promising culture for region of the Brazilian northeast, however they are still scarce studies to make possible the expansion of this culture, especially as the fertilization. This experiment was accomplished in the department of Environmental Sciences of the Rural Federal University of the Semi-arid (UFERSA), Mossoró, RN, with the objective of evaluating the effect in different ammonium:nitrate ratios in the initial development of the popcorn. The design was used randomized entirely with five treatments and four repetitions, with the treatments being constituted of ratios different NH4 +: NO3 - (0/100, 25/75, 50/50, 75/25 and 100/0) and the experimental unit acted by a plant/vase. To the 45 DAS the plants were collected and appraised, as for the height, number of leaves, leave area, diameter the stem and matter total dry. The results obtained in this work evidence that plants of popcorn present a larger development when the supply of nitrogen is accomplished with application of this nutritious one in the form ammonium.

The current model of economic development is based on a predatory and exculpatory vision, which discloses a way of being inhuman. Implying in changes of perception, thoughts and values, it has seen, that the form as the nature is explored in accordance with varies the ambient perception of the community or group. This work objectified to analyze the perception of Juazeirinho/PB agricultural communities referring the extinction of biodiversity of caatinga, aiming at to delineate sensitization strategies that make possible the valuation of this biome. The work portrays a carried through participant research with the communities Escurinha and Mendonça. For the collection of data direct comment was used, with visits to the communities, dynamics, half-structuralized interview and accomplishment of meeting. According to community some vegetal and animal species are disappearing. Between the animals they are cited: corduniz (Nothura sp), gato do mato (Felisa tigrina), gato maracajá (Felis wildi), mocó (Kerodon rupestris), preá (Gálea sprixii), Tejo (Família Teiidae), tatu peba (Euphractus sexcinctus), tatu verdadeiro (Dasypus novmcinctus) e o guaxinim (Procyon camcrivorus).Between vegetables they had been cited: Aveloz (Euphorbia gimnoclada), Imbuzeiro (Spondias tuberosa), Aroeira (Myracroduom unrudeuva), Caatingueira (Caesalpinia pyramidali), Baraúna (Schnopsis brasiliensis), Quixabeira (Bumelia sertorum), Mufumbo (Combretum leprosum). We can verify that it is necessary to promote changes in the ambient perception of the studied communities, thus allowing, to awake for problematic ambient, to point and to search solutions, that take the valuation of local biodiversity.

With the objective of evaluate the changes in the physical-chemistry characteristics of the soil cultivated with bell pepper, fish effluent, natural phosphate and cow manure, an experiment was accomplished in the vegetable garden of the Universidade Federal Rural do Semi-árido-UFERSA. A randomized complete block design in split plot scheme with two replications within of block. In the plot the water types were designated (well water and fish effluent), in the subplot the treatments of the factorial 2x2, resulting from the combination of two match levels (with and without natural phosphate) with two cow manure levels (with and without cow manure), and in the sub-plot the evaluation times (before and after the bell pepper culture). Soil samples were collected before and after the bell pepper cultivation of 0-20 cm depth. After the assembly of the overhead irrigation and distribution of the treatments, it was collected of each plot a soil sample for the accomplishment of the physiochemical analyses. To verify the alterations happened in the soil with the treatments, after the last crop, to the 100 days after culture. Two sources of irrigation waters were used. The first originating from of a tubular well. And second of a Orecochomis niloticus cultivation. The appraised characteristics in the soil before and after the cultivation they were: chemical analysis of the soil (nitrogen, match, organic matter).

La variabilidad en guayaba en las colecciones de germoplasma en Brasil es todavía bastante restricta, existiendo muchas "landraces" a ser recolectadas y caracterizadas. La necesidad de diversificar y aumentar la disponibilidad de genotipos productivos y de buena calidad, hizo con que el Instituto Agronômico de Pernambuco (IPA) introdujera en la "Chapada do Araripe", en la región semiárida del Estado de Pernambuco, una colección de germoplasma de guayabo conducida bajo régimen de sequío. La colección es constituida de 21 accesos (IPA B-22.1, IPA B-15.1, IPA B-14.3, IPA B-14.2, Patillo 1.1, Patillo 1.2, Patillo 1.3, Patillo 2.1, Patillo 2.3, Red Selection of Florida 1, Ruby Supreme.2, Ruby Supreme.3, Surubim.3, EEF.3, IPA B-38.3, IPA B-38.1, White Selection of Florida.1, White Selection of Florida.2, Pentecostes.3, Grande Vermelha.2 e Red Selection of Florida.2) originarios de varias partes de Brasil. Fueron observados descriptores de caracterización y evaluación. Debido a su rusticidad, el guayabo se adaptó a la "Chapada do Araripe" y la colección presentó una gran variabilidad entre las características evaluadas. Considerando la doble utilización de ese germoplasma, se constató que los accesos de pulpa roja para la agrindustria Patillo2.3, Ruby Supreme.3, e IPA B-15.1 se han destacado por sus buenas producciones y Red Selection of Florida.1, por aliar buena producción a frutos grandes y de pulpa espesa. Entre los accesos destinados exclusivamente al consumo in natura, se debe destacar la 'Grande Vermelha.2' por las mismas razones.

The objective of this experiment was to evaluate the reply of the scarlet culture (Solanum gilo Raddi) irrigated submitted the different applied doses phosphate in the plantation hollow. The used experimental delineation was of randomized blocks, being tested four levels of simple superphosphate (0, 1.000, 2.000, 3.000 kg ha-1). The phosphate fertilization in the plantation caused an increase in the following characteristics total of fruits to plant, commercial weight of fruits to plant, not commercial weight of the fruits to plant and productivity to fruits to hectare. The doses of phosphate that got a bigger efficiency to get a good productivity in the conditions of Cassilândia-MS, was of 1590 kg ha-1 of simple superphosphate that is the equivalent 286,2 kg of P2O5.