scholarly journals Productivity of Selected Cabbage Varieties under Varying Drip Irrigation Schedules in Humic Nitisols of Embu County, Kenya

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Stephen O. Onkoba ◽  
Charles N. Onyari ◽  
Bernard M. Gichimu
Keyword(s):  
Drip Irrigation ◽  
Block Design ◽  
Irrigation Schedule ◽  
Field Capacity ◽  
Vegetable Production ◽  
Irrigation Frequency ◽  
Crop Varieties ◽  
Input Use ◽  
Significant Difference ◽  
Net Revenue

Use of controlled irrigation in vegetable production is considered a viable option for optimizing input use and productivity. This study aimed at assessing the effects of different drip irrigation schedules on productivity and profitability of three cabbage varieties grown in humic nitisols of Embu County. The study was laid out in a split plot design arranged in Randomized Complete Block Design (RCBD). The drip irrigation schedules were allocated the main plots and crop varieties allocated the subplot treatments. Cabbage test varieties investigated were Riana F1 (V1), Gloria F1 (V2), and Triperio F1 (V3). Irrigation schedule one (S1) involved application of irrigation water twice a week, S2 once a week, and S3 once every two weeks. Soil water content was determined before irrigation and then replenished to field capacity using a known volume of water. The data were subjected to Analysis of Variance using SAS version 9.4. Mean separation was done using Fisher’s least significant difference at 95% level of confidence. The findings revealed that the yields and net revenue obtained from different cabbage varieties were not significantly different. However, the cabbage yields and subsequent revenue increased as irrigation frequency increased. The study recommends adoption of irrigation schedule S1 whose productivity remained high despite the high cost of production.

scholarly journals Performance of Aquaculture Effluent for Tomato Production in Outdoor Raised Beds

2020 ◽  
Vol 30 (5) ◽  
pp. 624-631
Author(s):  
D. Allen Pattillo ◽  
Wheeler G. Foshee ◽  
Eugene K. Blythe ◽  
Jeremy Pickens ◽  
Daniel Wells ◽  
...  
Keyword(s):  
Block Design ◽  
Tomato Fruit ◽  
Fruit Yield ◽  
Effluent Treatment ◽  
Vegetable Production ◽  
Nutrient Analysis ◽  
Tomato Production ◽  
Significant Difference ◽  
Foliar Nutrient ◽  
Aquaculture Effluent

Raised bed production trials were conducted to evaluate the effectiveness of effluent from a biofloc-style recirculating aquaculture system producing nile tilapia (Oreochromis niloticus) as nutrient-rich irrigation water for fall ‘Celebrity’ tomato (Solanum lycopersicum) production. The objective of this study was to provide baseline vegetable production data and justification for using aquaculture effluent as a water and nutrient resource. The experiment was a split-plot, randomized block design with three treatments: aquaculture effluent, granular fertilizer, and fertigation. Tomato seeds were sown in June, transplanted in August, and grown until Oct. 2019 in nine replicated raised beds. Conventional field tomato production practices were followed throughout the trial, and data were collected for tomato fruit yield, market quality, size, leaf greenness (SPAD), and foliar nutrient analysis. Fruit yield was similar between fertigated and aquaculture effluent treatments, with granular fertilizer resulting in yield that was significantly lower (P ≤ 0.033). SPAD measurements were similar among treatments. All nutrients met or exceeded sufficiency ranges. Foliar nutrient analysis revealed no significant difference for nitrogen, phosphorus, potassium, magnesium, calcium, boron, zinc, manganese, and iron among treatments. Sulfur and copper levels were significantly lower (P < 0.05) with aquaculture effluent treatment as compared with the granular and fertigated treatments. Overall, tomato production using aquaculture effluent as a water and nutrient supplement produced similar yields to commercial practices, making it potentially viable for producers.

scholarly journals APLICAÇÃO DE FUNGICIDA NA CULTURA DO TOMATEIRO VIA ÁGUA DE IRRIGAÇÃO EM CULTIVO PROTEGIDO

Irriga ◽  
2002 ◽  
Vol 7 (2) ◽  
pp. 81-90
Author(s):  
João Paulo Braga Araújo ◽  
Edson Luiz Furtado ◽  
Hélio Grassi Filho ◽  
Ana Paula Zimbardi Lombardi
Keyword(s):  
Disease Control ◽  
Drip Irrigation ◽  
Block Design ◽  
Control Plant ◽  
Recommended Dose ◽  
Tomato Crop ◽  
Fresh Matter ◽  
Randomized Block Design ◽  
Significant Difference ◽  
Septoria Lycopersici

APLICAÇÃO DE FUNGICIDA NA CULTURA DO TOMATEIRO VIA ÁGUA DE IRRIGAÇÃO EM CULTIVO PROTEGIDO   João Paulo Braga Araújo Departamento de Engenharia Rural,Faculdade de Ciências Agronômicas,Universidade Estadual Paulista, CP 237, CEP 18603-970, Botucatu – SP, Fone (0xx14)6802-7194Edson Luiz FurtadoHélio Grassi FilhoDepartamento de Recursos Naturais, Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, CP 237, CEP 18603-970, Botucatu – SP, Fone (0xx14)6802-7143, E-mail: [email protected] Paula Zimbardi LombardiDepartamento de Proteção de Plantas, Faculdade de Ciências Agronômicas,Universidade Estadual Paulista, CP 237, CEP 18603-970, Botucatu – SP, Fone (0xx14)6802-7167   1 RESUMO  O presente trabalho objetivou estudar os efeitos de uma nova técnica de aplicação de fungicida, através da água de irrigação (gotejamento), na cultura do tomate híbrido “Débora Plus”, no controle da doença causada pelo fungo Septoria lycopersici Sepg. Além de estudar a comparação dos tipos de aplicação, foi estudado também 6 (seis) doses do fungicida benomyl na fungigação. As doses utilizadas foram:  75% (59,5 mg/vaso), 50%  (119,0 mg/vaso), 25% a menos da dose recomendada (178,5 mg/vaso), 100% da dose recomendada (238,0 mg/vaso), 25% (297,5 mg/vaso) e 50% superior à dose recomendada (357,0 mg/vaso). As doses utilizadas nas aplicações via pulverização foram de 100% da dose recomendada pelo fabricante (238,0 mg/vaso). Para efeito de comparação entre os tratamentos avaliaram-se o número e pesos das matérias fresca e seca dos frutos colhidos e a altura das plantas. Na instalação do experimento adotou-se o delineamento em blocos casualizados com oito tratamentos e cinco repetições. De acordo com os resultados obtidos verificou-se que a aplicação convencional do benomyl, para controle da septoriose do tomateiro, foi superior à fungigação. Não houve diferença significativa entre as diferentes dosagens do produto na fungigação, mas houve o controle da doença. O parâmetro altura das plantas foi semelhante para todos os tratamentos, evidenciando que  tanto a fungigação como a pulverização convencional não interferiu no crescimento das mesmas. O cultivo das plantas em casa de vegetação, utilizando vasos, proporcionou excelente resultado no controle de pragas e doenças, pois os tomateiros não apresentaram pragas tampouco outras doenças, além da  Septoria lycopersici, que foi inoculada. Mesmo nas plantas testemunhas não houve disseminação da septoriose e, a irrigação com garrafas individuais também indicou bons resultados, pois deste modo sabe-se a quantidade de exata de fertilizantes, defensivos e água aplicada na planta.  UNITERMOS: fungigação; benomyl; septoriose; gotejamento.     ARAÚJO, J.P.B., GRASSI FILHO, H., FURTADO, E.L., LOMBARDI, A.P.Z.  FUNGICIDE APLICATION ON TOMATO CROP BY DRIP IRRIGATION UNDER GREEN HOUSE CONDITIONS   2 ABSTRACT  This research aimed to study the effects of a new fungicide application technique  using irrigation water (drip irrigation) in “Debora Plus” hybrid tomato crop on the disease control caused by Septoria lycopersici Sepg mushroom.  Besides comparing the application types, six doses of  benomyl fungicide on the fungigation have also been studied.  The doses were applied as follows: 75% (59.5 mg/pot), 50% (119.0 mg/pot), 25% under the recommended dose (178.5 mg/pot), 100% recommended dose (238.0 mg/pot), 25% (297.5 mg/pot) and 50% over the recommended dose (357.0 mg/pot). The spraying application doses  were 100%  the recommended dose (238.0 mg/pot). For comparative effect among treatments, fruit number, dry and fresh matter weight and height have been evaluated. The experiment was laid out in randomized block design with 8 treatments and 5 replications. . The results showed that the benomyl conventional application  for tomato septoriosis control  was better than  the fungigation.  There was no significant difference among  different dosages of the product in the fungigation although  there was  the disease control. Plant height was similar for all treatments showing that both fungigation and conventional spraying had no influence on plant growth. Plant growing using pots under greenhouse condition provided excellent results on disease and pest control, as the tomato plants did not present neither pests nor other diseases unless Septoria lycopersici which was inoculated. There was no Septoria dissemination even on the control plants.  The irrigation using single bottles has also presented good results since the exact amount of applied fertilizer, pesticide and water is known through this procedure.  KEYWORDS: fungigation; benomyl; septoriosis; drip irrigation. 

scholarly journals Water requirement and yield of fig trees under different drip irrigation management

2014 ◽  
Vol 34 (1) ◽  
pp. 17-27 ◽  
Author(s):  
Irineu P. de S. Andrade ◽  
Daniel F. de Carvalho ◽  
Wilk S. de Almeida ◽  
Jonathas B. Gonçalves Silva ◽  
Leonardo D. B. da Silva
Keyword(s):  
Drip Irrigation ◽  
Rio De Janeiro ◽  
Irrigation Management ◽  
Water Requirement ◽  
Growth And Yield ◽  
Soil Conditions ◽  
Irrigation Frequency ◽  
Experimental Area ◽  
Significant Difference ◽  
Fig Trees

This work aimed to study the effect of drip irrigation management on growth and yield of the 'Roxo de Valinhos' fig tree (Ficus carica L.), at three years old, and to determine crop coefficients (Kc) and its water requirement (ETc) under Baixada Fluminense climate and soil conditions, state of Rio de Janeiro, Brazil. The study was carried out in the experimental area of SIPA (Sistema Integrado de Produção Agroecológica) in Seropédica, Rio de Janeiro State, from July 2011 to May 2012. The experimental area was divided in two blocks, named B1 (sandy clay loam texture) and B2 (loamy sand texture). In each block, irrigation frequencies (IF) of two (T1) and four days (T2) were evaluated, as well as the irrigation absence (T3). Irrigation management and water consumption determination were performed through the soil water balance, using the TDR technique. Plant growth was not affected by IF, differing only in the number of produced internodes. For both soil textures, the mean Kc was 0.60, with a significant difference (p<0.05) only for IF. The estimated mean yield showed no significant differences between both textural classes, ranging from 6,612 kg ha-1 (T3) to 8,554 kg ha-1 (T1). This study indicates the importance of irrigation frequency in the irrigation management of fig trees cultivated in soils with different physical characteristics.

The Combined Effects of Salinity and Water Stress on the Growth and Yield Quality of Tomato

2013 ◽  
Vol 295-298 ◽  
pp. 2265-2273 ◽  
Author(s):  
Xiang Ping Guo ◽  
Murava Raphinos Tackmore ◽  
Kargbo Obai ◽  
Mohamed Khaled Salahou
Keyword(s):  
Salt Stress ◽  
Water Stress ◽  
Growth Parameters ◽  
Block Design ◽  
Field Capacity ◽  
Growth And Yield ◽  
Marketable Yield ◽  
Significant Difference ◽  
Stress Levels ◽  
Yield Quality

The effects of two soil salinities (1g/kg and 6g/kg) and two water stress levels (60% and 80% of the field capacity) on growth and yield parameters of Meiguo903 tomato were investigated under greenhouse conditions. A randomized complete block design experiment with three treatments and four replications was conducted. The treatments were defined as: CK (no water stress and no salt stress), T1 (no water stress but salt stress) and T2 (water stress and salt stress). The results show that more water was applied in CK than the other treatments, but T2 saved water by about 10%. Measured growth parameters showed that water stress and salinity affected the height and stem diameter of the plants. In general, T2 had short plants with thin stems, T1 had a little taller and thin stems while CK had tall plants with thick stems. It was found that both salinity and water stress has a significant effect on total marketable yield. T1 reduced the yield by 37% while T2 conditions reduced the yield by about 43%. Comparing T1 and T2 which were subjected to the same saline conditions (but different water stress levels), there is a significant difference on the amount of water used, where T1 is the highest, but there is no significant difference on their yield. These results give the conclusion that, in a saline environment, water stress can save water and produce a yield close to that when full irrigation is applied. Nearly optimum yields can be achieved by proper water stress management in such an environment.

scholarly journals The Effect of Some Primary Tillage Equipment on Performance Efficiency Under Two Level of Soil Moisture Content and Different Machinery Unit Speeds

2018 ◽  
Vol 7 (2) ◽  
pp. 206-218
Author(s):  
Yasir A. Alsayyah ◽  
Hussein A. Jebur
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Fuel Consumption ◽  
Soil Moisture Content ◽  
Block Design ◽  
Field Capacity ◽  
Significant Difference ◽  
Primary Tillage ◽  
Loam Soil ◽  
Drawbar Pull

A field experiment was conducted in the experiment fields of the college of agriculture - University of Baghdad – Abu Ghraib , 2016 in a silt clay loam soil , to Evaluate the effect of some primary tillage equipment and two of levels of soil moisture content in some of performance efficiency indicator for different forward speed , ArmaTrac 845e and ITM 285 New tractor with moldboard and chisel and sweep plow as a machinery unit have been used in this study . Two levels of soil Moisture content include (18 – 20 % ) and (14 – 16%) represented main plot , three types of plow ( moldboard , chisel and sweep) represent sub plot , five machinery speeds included ( 1.5 , 2.53 , 3.75 , 5.3 and 6.71 km.hr-1 ) represent sub plot , Slippage percentage (%) , fuel consumption (L.hr-1) , drawbar pull (KN) , Field capacity (he.hr-1) are have beenbeen measured in this study  . And the results have been analyzed by using the order of the spilt - spilt - plot with randomize complete block design with three replicates and tested by the way averages less significant difference and the level of probability of 0.05 . The results show that : the soil  moisture content ( 14 – 16 % ) has got a less value of slippage percentage % , fuel consumption L.hr-1 , drawbar pull Kn and higher field capacity ha.hr-1 , and sweep plow has got a less value of slippage percentage , fuel consumption and drawbar pull , and the chisel plow has got a higher field capacity , and when the tractor speed is increased it leads to aincrease in the slippage and fuel consumption and drawbar pull and field capacity will be anincrease .

Scheduling drip irrigation for ginseng (Panax quinquefolius L.) grown under straw and bark mulch

2007 ◽  
Vol 87 (2) ◽  
pp. 373-381 ◽  
Author(s):  
R. C. Roy ◽  
B. R. Ball Coelho ◽  
A. J. Bruin ◽  
R. Reeleder ◽  
B. Capell
Keyword(s):  
Soil Water ◽  
Water Use ◽  
Drip Irrigation ◽  
Field Capacity ◽  
Growing Season ◽  
Yield Response ◽  
Root Yield ◽  
Irrigation Frequency ◽  
Straw Mulch ◽  
Horticultural Crops

Responses of ginseng to drip irrigation regimes and organic mulches were determined in two experiments beginning in 1998 and 1999. Treatments were four soil water content thresholds for irrigation: 0, 0.08, 0.12 and 0.16 m3 m-3 (θ0, θ8, θ12, and θ16, respectively); combined with either straw or bark mulch. In its first growing season, ginseng did not require irrigation in 1999 or 2000. In subsequent years, irrigation was generally more frequent when applied at higher moisture threshold levels, but precipitation affected irrigation frequency under all treatments. Water use increased with crop age to 3yr, to about 65% of the requirement of unshaded horticultural crops. Seed yield from 3-yr-old plants under straw mulch in 2001 was greater in response to θ12 and θ16 than to θ8 or θ0. Root yield response to irrigation threshold was linear for 2- and 3-yr- old plants under straw mulch in 2001, and quadratic for 3-yr-old plants under bark mulch in 2002. The optimal threshold to initiate drip irrigation was approximately 65% of field capacity. Key words: Root, soil water, water use

scholarly journals Effect of Drip Irrigation Frequency, N-Fertilization, and Mulching on Yield, Nitrogen, and Water Use Efficiencies of Cucumber (Cucumis sativus L.) in Ikole-Ekiti, Nigeria

2021 ◽  
Vol 11 (2) ◽  
pp. 184-191
Author(s):  
Abayomi Sunday Fasina ◽  
Olubunmi Samuel Shittu ◽  
Kayode Samuel Ogunleye ◽  
Augustus Oludotun Akinmayowa Ilori ◽  
Temitope Seun Babalola
Keyword(s):  
Water Use ◽  
Nitrogen Fertilization ◽  
Drip Irrigation ◽  
Block Design ◽  
Nutrient Use Efficiency ◽  
Irrigation Scheduling ◽  
Irrigation Frequency ◽  
Cucumis Sativus L ◽  
Use Efficiency ◽  
Cucumber Yield

Soil moisture conservation, proper irrigation scheduling and nutrient management are crucial for sustainable cucumber production. A field experiment was set up over two years (2018 and 2019) to investigate the effects of irrigation frequency, black polyethylene mulching, and nitrogen fertilization on cucumber yield, water use efficiency (WUE) and nutrient use efficiency (NUE) at Ikole-Ekiti, Nigeria. The experiment was a 3 x 2 x 2 factorial in a randomized complete block design (RCBD) with a split-plot arrangement and the main plot as drip irrigation frequency: twice per week (I4), three times per week (I5), and four times per week (I6), while the sub-plots were nitrogen fertilization; (no fertilizer, N0 and 180 kg/ha urea, N180) and mulching (no mulch, NM and mulch, M). The highest yield (8.39 and 8.51 t/ha) with the best WUE was obtained from treatment I4MF (F, fertilization), while the lowest (5.81 and 5.79 t/ha) was obtained from I6MF for the respective years. The combination of variables significantly (P<0.05) influenced cucumber yield, WUE, and NUE, and significant correlations were obtained (r=0.87** and 0.85**) between WUE and fruit yield for the study years. The treatment I4MF therefore, could successfully be adopted to reduce water and fertilizer application for improved cucumber yield in the field.

scholarly journals Effect of Water Stress on Crop Yield and Water Productivity of Drip-irrigated Pepper (Capsicum Spp.) in Southwest Nigeria

2020 ◽  
pp. 131-143
Author(s):  
Samuel D. Oluwagbayide ◽  
Muyiwa A. Okusanya ◽  
Anthony A. Amori ◽  
Joshua O. Akintade
Keyword(s):  
Water Stress ◽  
Crop Yield ◽  
Drip Irrigation ◽  
Growth Parameters ◽  
Block Design ◽  
Water Productivity ◽  
Irrigation Regimes ◽  
Significant Difference ◽  
Southwest Nigeria ◽  
Capsicum Spp

This research presents the effects of water stress on crop yield and water productivity of two local varieties of pepper (Capsicum spp.) under various drip irrigation regimes in Southwest Nigeria. Study Design: The study was conducted during the 2018 and 2019 cropping seasons at the Teaching and Research Farm of Agricultural and Bio-Environmental Engineering of Federal Polytechnic, Ilaro, Nigeria. The experiment was a 2 x 4 factorial experiments arranged in a randomized complete block design (RCBD) with two varieties of pepper (Capsicum chinense and Capsicum frutescens) and four drip irrigation regimes: 100%, 75%, 50% and 25% of actual crop evapotranspiration (ET100, 75, 50, 25) and replicated four times. The experiment was repeated in the second year late season. Water was applied from 3 weeks after transplanting (WAT) after which growth parameters, crop water productivity and crop yield were monitored and subjected to statistical analyses. The water productivity, crop yield and other crop growth parameters such as plant height, number of leaves, fruit length and weight were higher during the two seasons for the two pepper varieties under ET100 and ET75 irrigation regimes compared with ET50 and ET25 respectively. A significant difference (p<0.05) was observed in the growth parameters in all the treatments. However, there was no significant difference (p>0.05) in the water productivity components for ET100 and ET75 irrigation regimes. The best water productivity was observed for the ET75 drip irrigation regime. Therefore, the ET75 regime was recommended for the two pepper varieties to ensure sustainable cultivation and production of the two varieties in the study area.

scholarly journals Nutrient Expert Impact on Yield and Economic In Maize and Wheat

2018 ◽  
Vol 6 (1) ◽  
pp. 45-52
Author(s):  
Sahara Dahal ◽  
Abhisek Shrestha ◽  
Sabina Dahal ◽  
Lal Prasad Amgain
Keyword(s):  
Field Experiment ◽  
Block Design ◽  
Wheat Yield ◽  
Maize Yield ◽  
Yield Attributes ◽  
Expert Recommendation ◽  
Lower Productivity ◽  
Significant Difference ◽  
Net Revenue ◽  
Yield Gaps

The lower productivity and higher yield gaps in major cereals are the dominant problems of agriculture in eastern-terai of Nepal. Hence, field experiment was conducted to evaluate Nutrient Expert® wheat and maize model on farmer’s field at two sites each for maize and wheat in Morang and Jhapa district. The experiment was conducted in Randomized Completely Block Design replicated among twenty farmers in each district. Two treatments executed were NE (Nutrient Expert Recommendation) and FFP (Farmer Fertilizer Practices).The result revealed significant difference in terms of morphology, yield attributes and yield of wheat and maize. The highest wheat yield (4.71 ton ha-1) was obtained from NE followed by FFP (3.00 ton ha-1) in Jhapa and in Morang, was (4.01 ton ha-1) in NE followed by (2.05 ton ha-1) in FFP. In contrary, the higher maize yield (9.22 ton ha-1) was obtained from NE followed by FFP (4.94 ton ha-1) in Jhapa and (8.059 t ha-1)in Morang NE followed by FFP (4.52 ton ha-1). The net revenue of NE wheat in Morang was found to be increased by 344.799% while in maize the increment in net revenue of NE was only by 131.158% in Jhapa than in Morang. NE based practices produced significantly higher productivity and profitability in comparison with FFP.Int. J. Appl. Sci. Biotechnol. Vol 6(1): 45-52

scholarly journals INTRUSÃO DE RAIZES DE EUCALIPTO EM GOTEJADORES ENTERRADOS

Irriga ◽  
2010 ◽  
Vol 15 (3) ◽  
pp. 282-300 ◽  
Author(s):  
Ralini Ferreira de Melo ◽  
Marconi Batista Teixeira ◽  
Yanê Borges Garcia Grube ◽  
Rubens Duarte Coelho
Keyword(s):  
Drip Irrigation ◽  
Irrigation System ◽  
Eucalyptus Grandis ◽  
Field Capacity ◽  
Eucalyptus Urophylla ◽  
Irrigation Flow ◽  
Significant Difference ◽  
Lateral Lines ◽  
Protective Environment ◽  
Subsurface Drip

Com o propósito de avaliar o potencial de intrusão radicular do eucalipto nas linhas de irrigação em diversos modelos de gotejadores, quando utilizados em irrigação subsuperficial, foi realizado um experimento utilizando caixas d’água de amianto de 100 L em condição de ambiente protegido. Os tratamentos consistiram de 14 modelos de gotejadores de diferentes marcas comerciais, dos quais sete do tipo não compensante e sete do tipo autocompensante de pressão. Os modelos foram instalados em duas profundidades, de 0,15 m e 0,30 m (P15 e P30, respectivamente), e conduzidos em solo mantido à capacidade de campo. Foram realizadas cinco leituras de vazão em intervalos que oscilaram de 32 a 131 dias, totalizando 235 dias. Os resultados mostraram diferenças marcantes no comportamento dos gotejadores do tipo não compensante de pressão daqueles do tipo autocompensante e, dentro de cada tipo, diferenças significativas quanto à suscetibilidade à intrusão das raízes do eucalipto. Quanto ao efeito da intrusão e enterrio, os modelos autocompensantes apresentaram maior magnitude de variação da vazão em relação aos gotejadores não compensantes, no experimento conduzido. Nos modelos mais susceptíveis, observou-se maior nível de intrusão na condição de enraizamento, porém não foi observada diferença significativa no nível de intrusão das raízes em relação à profundidade de instalação dos gotejadores. As raízes do eucalipto se mostraram agressivas na penetração nos gotejadores, chegando a ocorrer o estrangulamento nos modelos Acqua-Traxx, Carbodrip, Hydrogol e Hydro Drip II. A penetração das raízes, também ocorreu no interior das linhas laterais, ampliando o efeito da intrusão na malha hidráulica da parcela de irrigação. Recomendam-se adequações em parâmetros da arquitetura ou no processo de montagem destes tubos gotejadores com a finalidade de minimizar as intrusões radiculares quando usados para a cultura do eucalipto.   UNITERMOS: gotejamento, variação de vazão, Eucalyptus grandis vs. Eucalyptus urophylla     MELO, R. F. DE, TEIXEIRA, M. B., GRUBER, Y. B. G., COELHO, R. D., ROOT INTRUSION OF THE EUCALYPTUS IN SUBSURFACE DRIP IRRIGATION   2 ABSTRACT   This experiment was performed aiming to evaluate the potential of eucalyptus root intrusion in irrigation rows using various emitter models when applied in subsurface irrigation; asbestos water tanks of 100L were utilized in protective environment (a greenhouse). The treatments consisted of 14 emitter models from different brands, seven non-pressure and seven pressure compensating types. The models were installed at two depths 0.15 m and 0.30 m (P15 and P30 respectively) and conducted in soil kept at field capacity. Five flow readings at intervals that ranged from 32 to 131 days were performed, totaling 235 days. The results showed striking differences in pressure and non-pressure compensating emitters behavior and within each type significant differences in susceptibility towards the intrusion of eucalyptus roots. Regarding the intrusion and burial effect, self-compensating models had higher magnitude of flow variations in relation to non-compensating emitter. In the most susceptible models there was a higher level of intrusion on rooting condition, but no significant difference was observed in the roots intrusion levels in relation to the emitter installation depth. Eucalyptus roots proved aggressive in penetrating the emitters, coming to strangling models Acqua-Traxx, Carbodrip, Hydrogol, and Hydro Drip II. Roots attack also occurred within the lateral lines extending the effect of intrusion to the network pressure plot irrigation. This study recommends adjustments on the architecture parameters or on the drip irrigation system assembling process in order to minimize root intrusion when used for eucalyptus cultivation.   KEYWORDS: drip irrigation, flow variation, Eucalyptus grandis vs. Eucalyptus urophylla  

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