The objective of this work was to evaluate the effect of different levels of nitrogen and potassium fertilization, applied in covering, on the yield and quality of sugarcane (Saccharum ssp., variety SP- 716949) under irrigation. The experiment was conducted in an area of the Miriri`s distillery, in the Capim district, PB. The treatments were constituted by four levels of covering fertilization: AC1- 85 kg ha-1 ( 44 kg de N plus 41 kg de K2O), AC2 - 167 kg ha-1 (86 kg de N plus 81 kg de K2O), AC3 - 305 kg ha-1 (157 kg de N plus 148 kg de K2O), AC4 - 458 kg ha-1 (236 kg de N plus 222 kg de K2O), arranged in an experimental design of randomized blocks, with three replications. The analyzed variables were: productivity of stems, percentage of ºBrix, Pol and PCC, yield of sugar and alcohol. Among of studied variables, just the productivity of stems was affected significantly (p < 0.05) by the fertilization. The regression analyses revealed that the largest productivity of the stems (108.21 t ha-1), the maximum percentage of PCC and ºBrix (14.35 e 20.40%) and the maximum yield of alcohol (9948 L ha-1) were obtained with the level of covering fertilization of 458 kg ha-1 (236 kg de N plus 222 kg of K2O).

The experiment was conducted at the Soil Laboratory of the Center for Agrarian Sciences, Federal University of Alagoas to evaluate the effect of different sources of phosphorus, with different levels of humidity on the diffusive flux of phosphorus in soil samples from the State of Alagoas. Samples of four soils from different locations were used. The P sources used were the KH2PO4, Ca(H2PO4)2 and NH4H2PO4, considering two levels of humidity (40% and 80% of field capacity of soil). The test consisted of a factorial arrangement (4 x 3 x 2), corresponding, respectively, the four soils, three sources of phosphorus and two levels of moisture, with four replications in randomized blocks. As experimental units were used rings of PVC. The dose of phosphorus was 50% of maximum capacity for adsorption of phosphorus. To evaluate the diffusive flux, were used anion-exchange paper (PA). The PA was prepared using a filter paper immersed in solution of FeCl3.6H2O and then transferred to a solution of NH4OH. After dried, the leaves were cut into strips and placed in the soil samples. The estimate of the diffusion was performed by quantification of phosphorus adsorbed to the PA. In general, the diffusive flux increased with the decrease in clay content of soils and the higher water content and the source NH4H2PO4 favored greater diffusion.

An experiment was carried out at a greenhouse of Plant Science Department of the Universidade Federal Rural do Semi-Árido (UFERSA), Mossoró-RN, in the period of May to June of 2006, with the evaluate the agronomic performance of beans mungo in function of their times of decomposition of scarlet starglory incorporated. A completely randomized desing with six treatments and five replications. The treatments consist of: T1 - 130g pot-1 of scarlet starglory in green base fresh with twenty-eight days incorporated; T2 -130g pot-1 of scarlet starglory in green base fresh with twenty one days incorporated; T3 - 130g pot-1 of scarlet starglory in green base fresh with fourteen days incorporated; T4 - 130g pot-1 of scarlet starglory in green base fresh with seven days incorporated; T5 - 130g pot-1 of scarlet starglory in green base fresh with zero days incorporated; T6 - Control (no Fertilized soil). The beans mungo cultivar planted was green gold. The evaluated traits were: plant height, dry mass and yield of grains. All the times traits were significantly affected by the amounts of scarlet starglory incorporated. Height mean value for plant height, dry mass and yield of grains were obtained in the amount of scarlet starglory incorporated of 28 days.

The aim of this study was to evaluate the growth and spatial distributions of Croton urucurana (sangrad` água) in Dourados-MS. They had been marked, using systematic systematic sampling, 15 plots of 100 m2 in which had been identified all individuals of Croton urucurana that they had been to classified phase of development in young, youthful and adult. To classify the species in the spatial patterns the Payandeh index was used. It was verified 943 individuals with aggregate spatial distribution in the area in study. C. urucurana is in regeneration process with has predominance of young and youthful individuals, 54.1% and 28.4%, respectively, in relation to the adult individuals (17.5%).

The desertification generates and accents the scarcity of vital natural resources for the survival human being, as drinking waters, alone agriculturist and vegetation. Implying in social and economic problems in the affected areas. Recently the remote sensing and the techniques of geoprocessing has been used in diverse areas of the research, mainly in the ambient monitoring of Brazil. For its great territorial extension the application of these tools is of great importance in the country, has seen that if it can thus carry through diagnostic of areas of difficult access by means of transports and in accordance with the secular resolution of the effective satellites can be carried through a monitoring of these areas. The present study it has as objective to analyze the evolution of the process of desertification through the NDVI in the region of the Hinterland of the State of Pernambuco through a secular series of images Landsat Thematic Mapper (TM) that it includes years 1994, 1997 and 2001. It was applied the Surface Energy Balance Algorithm for Land - SEBAL, this algorithm calculated the albedo and the Normalized Difference Vegetation Index for each pixel of the images. It was verified that the characteristic vegetation of the region diminished its area, showing that the analyzed areas meet in process of loss of the vegetation that can lead to the desertification process.

The present work had the aim to study the seasonal variation of the groundwater quality for irrigated at Lagoa de Salsa region in the district of Tibau (RN) during in the rainfall and drought season of 2008 and 2009. Sample water 24 were collected in aquifer distributed spatially in produced area in region at the two stationsalong. The variables electrical conductivity, Na, Ca, Mg, SAR, CO3, HCO3 and Cl were analyzed. The results showed that majority of the groundwater for irrigation in the Tibau microregion have use limitation. The concentrations for rain season was low in relation drought season, decreased salinity risk to mayoral parameters analyzed.

The objective of this work was to evaluate the influence of crescents phosphorus levels in two hybrids of forage sorghum cultivated on "Zona da Mata" region, State of Alagoas. The treatments were two hybrids of forage sorghum: BRS304 e BRS310, and four phosphorus levels: 0, 25, 50 e 75 kg ha-1. The statistical design was the complete randomized block with four replications in a split plot scheme. Each experimental plot was constuited for five row of 4.5 m, spaced of 0.70 m. The soil of experimental area received lime to increase basis saturation to 60%. During the sowing, all experimental area received 100 and 120 kg ha-1 of N and K, respectively. The plants were collected 40, 50, 60 e 70 days after emergence. The mass collected was separaeted in leaves photosynthetic active and remaining of the plant. When the grains were on the "farináceo duro" stage, the yield was evaluated in 1.4 m2 on plots center. The phosphoted fertilization increases linearly the sorghum production until 75 kg ha-1 level of P. The phosphorus provides better grain participation on total dry matter of sorghum plants.

Seeds of Caesalpinea ferrea Mart. ex Tu. var. leiostachya Benth. present low and irregular germination due to dormancy caused by the impermeability of the tegument. With the purpose to determine an efficient method to accelerate and uniformize seed germination, they were submitted to different immersion periods (0, 5, 10, 15, 20, 25 and 30 minutes) in sulfuric acid (95-98%), influence emergency and vigor (first count, speed index, medium time and relative frequency of emergency, length and dry matter of the seedlings). The experiment was carried out under greenhouse conditions with an experimental design of completely randomized, with seven treatments and four replications. The pre-conditioning of the seeds with immersion in concentrated sulfuric acid was efficient to overcoming seed dormancy, by increasing the percentage and speed emergency, the first count of emergency, length and dry matter of seedlings and reduction in the medium time for emergency. The efficiency of this chemical treatment with concentrated sulfuric depends on the immersion time, and 10 to 20 minutes were the most adequate to provide larger emergency uniformity percentages and vigor.

The objective of this research was to know the species and the population fluctuation of fruit flies (Diptera: Tephritidae) in a commercial mango (Mangifera indica L.) orchard in the coast of Ceará State. The study was developed from July of 2005 to July of 2007, in the municipality of Beberibe (CE). The capture of the fruit flies was performed using McPhail traps with 5% corn protein hydrolyzed solution as attractant. Weekly, the captured insects were sorted, the fruit flies were maintained in 70% alcohol solution and subsequently identified. The population fluctuation was estimated using the FTD (Fly/Trap/Day) index. During the research, six fruit flies species were captured: Anastrepha obliqua (Macquart) (63%), A. zenildae Zucchi (7%), A. sororcula Zucchi (5%), A. fraterculus (Wied.) (2%), A. distincta Greene (2%) and Ceratitis capitata (Wied.) (21%). The Anastrepha spp. and C. capitata population peaked was between April and July, in both years of study.

A field experiment was developed in the period of April of 2000 to May of 2002, at the Experimental Station of Jiqui pertaining to the Empresa de Pesquisa Agropecuária do Rio Grande do Norte - EMPARN, Parnamirim city, state of Rio Grande do Norte. The work had as objective to evaluate the effects of nitrogen and potassium applied through irrigation water on the vegetative behavior and productive of green dwarf coconut tree (Cocos nucifera L). The treatments had consisted of the combination through the experimental matrix of Pan Puebla III, 5 doses of N and 5 doses of K2O both oscillating of 135 the 2565g plant -1 year -1 derived of the urea and potassium chloride. The used experimental design was of blocks at random with 4 repetitions and 5 plants for plots totalizing 40 experimental units. The plantation was made in the triangular spacing of 7.5 m between plants and 7.5 m between lines. During the 5th year of culture, from April of 2001 to May of 2002 was quantified the number of fruits in the 13 harvest carried out. The referring variables to the vegetative development, height and circumference of stem, diameter of the top and leaf number, had been measured in May of 2002, in the end of the experiment. The stem circumference increased linearly with the increase of the doses of N and of quadratic form with the doses of K with the biggest value for the dose of 1350 g plants -1 year-1. The leaf number answered only the nitrogen applications. The growth in stem height had influence of N and K, however, data did not adjust to no mathematical model. The diameter of the top of the green dwarfed coconut palm did not suffer significant interference of no applied fertilizer through irrigation water. The number of fruits increased quadratically with the N and K doses. The maximum physical efficiency of the production, 154.75 fruits plants -1 year -1, it was reached with the doses of 1437 g plants -1 year -1 of N and 1553 g plants -1 year -1 of K.