scholarly journals ESTIMATIVA DO COEFICIENTE DE COBERTURA EM UMA CULTURA DE MELÃO

Irriga ◽  
2004 ◽  
Vol 9 (1) ◽  
pp. 89-93 ◽  
Author(s):  
José Wilson Tavares Bezerra ◽  
Benito Moreira de Azevedo ◽  
Thales Vinícius de Araújo Viana ◽  
Francisco De Queiroz Porto Filho
Keyword(s):  
Irrigation Water ◽  
Drip Irrigation ◽  
Root Zone ◽  
Ground Cover ◽  
Reduction Factor ◽  
Water Saving ◽  
The Other ◽  
Vegetative Development ◽  
Development Stages ◽  
Partial Wetting

ESTIMATIVA DO COEFICIENTE DE COBERTURA EM UMA CULTURA DE MELÃO  José Wilson Tavares Bezerra1;  Benito Moreira de Azevedo1; Thales Vinícius de Araújo Viana1; Francisco de Queiroz  Porto Filho21Departamento de Engenharia Agrícola, Universidade Federal do Ceará, UFC. Curso de Mestrado em Irrigação e 2Drenagem,  [email protected] Superior de Agricultura de Mossoró-ESAM. Mossoró-RN  1 RESUMO  Na irrigação localizada a economia de água se tornou uma grande vantagem em relação aos outros métodos.  Esta economia de água deve-se, principalmente, ao fato deste método de irrigação umedecer somente parte do solo no qual se encontram as raízes da planta.  O cálculo da quantidade de água necessária a cultura, pode ser obtido indiretamente a partir do coeficiente de cobertura do solo, utilizando o coeficiente de redução.  O objetivo deste trabalho foi de estimar o coeficiente de cobertura para a cultura do melão para as condições do município de Mossoró – RN.  Na pesquisa, o ciclo da cultura foi subdividido em cinco fases, sendo o, coeficiente de cobertura estimado no final e no ponto médio de cada fase. Os resultados mostraram que o coeficiente de cobertura variou entre os valores de 2,40 e 80,50 % nos finais das fases inicial e de floração, respectivamente.  Aos 52 dias após o plantio,  o coeficiente de cobertura atingiu 100%, este ponto coincidiu com o ponto médio da fase de frutificação.  UNITERMOS: Irrigação localizada, desenvolvimento vegetativo e ciclo da cultura.  BEZERRA, J. W. T.; AZEVEDO, B. M. de; VIANA, T. V. de A.; PORTO FILHO, F. de Q. ESTIMATE OF COVERING COEFFICIENT FOR  MELON CULTURE  2 ABSTRACT  In localized irrigation water saving has become a great advantage in comparison to the other methods.  This water saving occurs mainly because this system causes partial wetting of the soil in the root zone.  Calculating how much water is necessary for the crop can be done indirectly using the reduction factor based on the crop ground cover. This paper aimed to estimate the ground cover coefficient for melon in Mossoró – RN.  In this study the melon growing cycle was divided into five development stages and the ground cover coefficient was estimated at the average and finals point of each stage.  The results showed that the covering coefficient varied between 2.40 and 8.50% in the end of the initial and flowering phases, respectively.  At 52 days after the melon planting, the ground cover coefficient reached 100%, which was the same one as the fructification stage.  KEYWORDS: drip irrigation, vegetative development and cycle of the culture.

scholarly journals Effect of Drip Irrigation and Complementary Nutrition with Nitrogen on Potato Quality and Yield

2018 ◽  
Vol 66 (1) ◽  
pp. 149-153
Author(s):  
Petr Elzner ◽  
Miroslav Jůzl ◽  
Miroslav Jůzl
Keyword(s):  
Field Experiment ◽  
Irrigation Water ◽  
Drip Irrigation ◽  
Tuber Yield ◽  
Vegetation Period ◽  
The Other ◽  
Yield Increase ◽  
Water Capacity ◽  
Irrigation Intensity ◽  
Small Plot

A small-plot field experiment started in 2016 studied effect of drip irrigation on potato tuber yield and starch levels in the tubers. Two potato varieties with different vegetation periods (Monika, Jolana) were exposed to four drip irrigation intensity levels. They were non-irrigated controls and irrigated tubers with 60 %, 65 % and 70 % usable soil water capacity levels. The other studied parameter was represented by the effect of nitrogen fertilisation with the nitrogen nutrient added to the irrigation water (fertigation) in the course of the vegetation period in contrast to one-off application of the whole nitrogen dose before the potato planting. All irrigated variants in comparison to the non‑irrigated controls showed 30–60 % yield increase. The effect of fertigation on yields was statistically insignificant. Starch levels in the tubers were mostly affected by the variety. The irrigated variants in comparison to the non-irrigated controls showed higher starch levels in the harvested tubers but the differences were statistically insignificant.

scholarly journals Water Saving and Yield of Potatoes under Partial Root-Zone Drying Drip Irrigation Technique: Field and Modelling Study Using SALTMED Model in Saudi Arabia

Agronomy ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1997
Author(s):  
Abdulrasoul Al-Omran ◽  
Ibrahim Louki ◽  
Arafat Alkhasha ◽  
Mohamed Hassan Abd El-Wahed ◽  
Abdullah Obadi
Keyword(s):  
Soil Moisture ◽  
Irrigation Water ◽  
Root Zone ◽  
Irrigation System ◽  
Potato Crop ◽  
Water Saving ◽  
Moisture Distribution ◽  
Use Efficiency ◽  
Potato Crops ◽  
Irrigation Levels

This study aims to evaluate the Partial Root Zone Drying Irrigation System (PRD) as one of the modern technologies that provide irrigation water and increase the efficiency of its use on potato crop. The effect of applying the PRD conventional deficit irrigation (CDI) on the efficiency and water saving in potato crops using the drip surface (S) and subsurface (SS) irrigation methods were investigated. SALTMED model used to predict soil moisture and salinity distribution, soil nitrogen dynamics, and yield of potato crop using the different irrigation levels (150%, 100%, and 50% of Crop evapotranspiration (ETc)). The study showed that the water use efficiency (WUE) decreases with increasing levels of irrigation water, as it ranged between 2.96 and 8.38 kgm−3, 2.77 and 7.01 kgm−3 for surface irrigation PRD and CDI, respectively, when the amounts of irrigation water varied from 308 mm to 1174 mm, respectively. The study showed that the irrigation efficiencies were the highest when using PRD system in all treatments when irrigating the potato crop during the spring season, and it was more efficient in the case of using subsurface irrigation method. The results show that the soil moisture (SM) was high in 25–45 cm at 150% of ETc was 0.166 and 0.263 m3m−3 for the first and last stages of growth, respectively. 100% of ETc, (SM) was 0.296 m3m−3 at 0–25 cm, 0.195 m3m−3 at 25–45 cm, 0.179 m3m−3 at 45–62 cm, depths, respectively. whereas 50% of ETc, (SM) was 0.162 m3m−3 at 0–25 cm, 0.195 m3m−3 at 25–85 cm, depths. At 100% of ETc, soil salinity was 5.15, 4.37, 3.3, and 4.5 dSm−1, whereas at 50%, ETc, these values were 5.64, 9.6, 3.3, and 4.2 dSm−1. Statistical indicators showed that the model underestimated yield, for 150%, 100%, and 50% of ETc. Therefore, it can be concluded that yield and WUE using PRD systems were the highest in the potato crop compare to CDI surface and sub-surface, and SALTMED model can predict the moisture distribution, salinity, and yield of potatoes after accurate adjustment.

scholarly journals TRANSITION FROM SURFACE TO DRIP IRRIGATION IN MOROCCO: ANALYSIS THROUGH THE MULTI-LEVEL PERSPECTIVE

AGROFOR ◽  
2019 ◽  
Vol 3 (3) ◽  
Author(s):  
Oumaima ASSOULI ◽  
Hamid EL BILALI ◽  
Aziz ABOUABDILLAH ◽  
Rachid HARBOUZE ◽  
Nabil El JAOUHARI ◽  
...  
Keyword(s):  
Water Use ◽  
Land Tenure ◽  
Irrigation Water ◽  
Drip Irrigation ◽  
Water Productivity ◽  
Irrigation Scheduling ◽  
Water Saving ◽  
Surface Irrigation ◽  
Irrigation Water Use ◽  
Multi Level

Agriculture uses more than 80% of water resources in Morocco. The sector isinefficient in terms of water use due to the dominance of surface irrigation. Toaddress this issue, there have been efforts in Moroccan strategies to convert surfaceirrigation to localized one. This paper analyses the dynamics of conversion fromsurface irrigation to drip irrigation in Fez-Meknes region (north-eastern Morocco)through the lens of the Multi-Level Perspective (MLP) on socio-technicaltransitions. MLP framework suggests that transitions are the results of dialecticinteractions among a niche (cf. novelty of drip irrigation), a regime (cf. traditionalsystem of surface irrigation) and the socio-technical landscape (e.g. policies). MLPwas complemented with a multi-capital approach to better assess transitionimpacts. Results show that the area equipped with drip irrigation in Fez-Meknesregion increased from 2174 ha in 2008 to 39290 ha in 2016. Different programshave been implemented in the framework of the Green Morocco Plan to fosterirrigation transition e.g. the National Irrigation Water Saving Program (PNEEI),launched in 2007, aims to convert 550,000 ha to localized irrigation (e.g. dripirrigation) in 15 years. Thanks to these programs, financial and technical supporthas been provided to farmers to promote the adoption of water-saving irrigationtechniques and practices. Farm-level results show that transition to localizedirrigation decreases irrigation water use, increases yields and profitability (cf. grossmargin per ha), and improves water productivity. Despite an enabling policylandscape and positive transition impacts, surface irrigation is still maintained inthe region and farmers are reluctant to change for many reasons (e.g. age andeducation level, unclear land tenure, financial and administrative difficulties).Efforts are still needed to train farmers on irrigation scheduling and on the use ofsmart irrigation techniques to save water. Further research is required to betterunderstand current bottlenecks in the irrigation transition process and designappropriate and context-specific transition governance strategies.

scholarly journals Penerapan Irigasi Tetes Emiter Tali Dengan Bebagai Selang Waktu Irigasi Pada Tanaman Semangka

2020 ◽  
Vol 19 (2) ◽  
pp. 128
Author(s):  
Muhammad Idrus Idrus ◽  
Surya Surya
Keyword(s):  
Soil Moisture ◽  
Irrigation Water ◽  
Drip Irrigation ◽  
Root Zone ◽  
Block Design ◽  
Water Productivity ◽  
Good Time ◽  
Time Interval ◽  
Irrigation Interval ◽  
Irrigation Water Productivity

The objectives of the research were (1) To know watermelon yield and irrigation water productivity of watermelon by used drip irrigation with nylon rope emitter on various time irrigation intervals, (2) To determined the good time irrigation interval for watermelon production by using the drip irrigation with nylon rope emitter. The research was conducted at the research field with four-time irrigation intervals were 1,2,3, and 4 days of time irrigation interval. The research was arranged in Completely Randomized Block Design. The result of the research showed that the time irrigation interval was not significantly affected yield and irrigation water productivity of watermelon. The soil moisture in the root zone at 30 cm depth of 23,23—23,88% before irrigation still in range of the available soil moisture content for plants. The average of watermelon yield and irrigation water productivity of watermelon were 5,07—5,45 kg/plant and 115,15—123,79 kg/m3. The good time interval of irrigation for watermelon production by using drip irrigation with rope emitter was 4 days time interval of irrigation.

scholarly journals Irrigation Management Affects Soil Solution NO3-N Concentration

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 755E-755
Author(s):  
Denise Neilsen ◽  
Gerry H. Neilsen ◽  
Peter Parchomchuk ◽  
Eugene J. Hogue
Keyword(s):  
Soil Solution ◽  
Irrigation Water ◽  
Drip Irrigation ◽  
Root Zone ◽  
Sprinkler Irrigation ◽  
Loamy Sand ◽  
Silt Loam ◽  
Silt Loam Soil ◽  
N Concentration ◽  
Loam Soil

Direct application of fertilizers in irrigation water (fertigation) has been advocated as an efficient method of fertilizing fruit trees. However, more information is needed on the relationship between irrigation and N inputs in order to target fertigation to meet plant demands. Soil solution NO3-N concentration was measured at three sites in response to the method of fertilizer application in which 25 g N/tree per year was either spring-broadcast with sprinkler irrigation or fertigated at 8 weekly intervals through drip irrigation; the amount of irrigation water in which 50 g N/tree per year was given in 63 daily fertigations with either 4 or 8 liters of water/day for two soil types and the concentration of fertigated N in which either 75 or 150 ppm NO3-N was given in 63 daily fertigations. Soil solution NO3-N concentration decreased rapidly for broadcast fertilizer with sprinkler irrigation and was lower than for weekly fertigation with drip irrigation. Doubling the amount of irrigation water effectively halved the soil solution NO3-N concentration in both the silt loam and loamy sand soils, although concentrations were higher in the silt loam soil. Movement of applied N below the root zone was halted for the silt loam soil by mid-summer with the lower amount of irrigation water, but was only delayed in the loamy sand soil. Doubling the average concentration of N in the irrigation water resulted in a doubling of the concentration of NO3-N in the root zone. A simple model was devised to predict the soil solution NO3-N concentration based on N and water inputs and fitted to measured values for daily and weekly fertigation.

scholarly journals Water smart technologies for irrigation water management of elephant foot yam in tropical zones of India

2019 ◽  
Vol 11 (4) ◽  
pp. 1495-1504
Author(s):  
S. Sunitha ◽  
James George ◽  
G. Suja ◽  
A. N. Jyothi ◽  
A. Rajalekshmi
Keyword(s):  
Irrigation Water ◽  
Root Zone ◽  
Foliar Application ◽  
Water Productivity ◽  
Ground Cover ◽  
Super Absorbent Polymer ◽  
Elephant Foot Yam ◽  
Tuber Crop ◽  
Smart Technologies ◽  
Absorbent Polymer

Abstract Water is the most crucial input in agriculture and declared to become the most scarce input in the near future, hence, judicious management of irrigation water is the need of the hour in tropical countries. In this study, a comparison of different water smart technologies, namely, porous ground cover mat, super absorbent polymer, partial root zone drying technique, bio mulching and foliar application of antitranspirant was made for enhancing water productivity in tuber crops using elephant foot yam as the test crop. Elephant foot yam (Amorphophallus paeoniifolius) is an important tropical tuber crop in India, and has attained commercial status in many states under assured irrigation. Mulching with ground cover mat and soil application of cassava starch-based super absorbent polymer recorded higher water productivity, reduced irrigation water requirement to 50% and enhanced the corm yield of elephant foot yam by 8–12% and energy use efficiency by 24–28% as compared to 100% irrigation. In the context of expected climate change and water scarcity, water smart technologies such as ground cover mats and super absorbent polymers would help in the cultivation of the tuber crop elephant foot yam with less irrigation, without adversely affecting the corm yield under humid tropical situations.

scholarly journals Improving Yield and Quality of Processing Tomato (Lycopersicon esculentum Miller) Using Alternate Partial Root-Zone Drip Irrigation in Arid Northwest China

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1503 ◽  
Author(s):  
Di Zhao ◽  
Zhenhua Wang ◽  
Jinzhu Zhang ◽  
Wenhao Li ◽  
Bo Zhou
Keyword(s):  
Fruit Quality ◽  
Irrigation Water ◽  
Drip Irrigation ◽  
Root Zone ◽  
Northwest China ◽  
Yield Reduction ◽  
Processing Tomato ◽  
Irrigation Water Use ◽  
Arid Northwest China

Processing tomato is one of the most important economic crops in Xinjiang, China, which was constrained with severe water shortage and extreme arid climate. Alternate partial root-zone irrigation (APRI) may provide an effective way to increase irrigation water use efficiency (iWUE) without yield reduction. However, limited studies concerned about applying APRI in processing tomato plantation have been done, especially combined with drip irrigation to further control the irrigation and improve iWUE. Therefore, the two-year pot experiments were conducted to study the effects of different irrigation treatments, including three APRI treatments (irrigation quota of 67.5, 51.6, and 43.7 mm, respectively), fixed partial root-zoon drip irrigation (FPRI, 67.5 mm) and conventional drip irrigation (CDI, 67.5 mm). The results indicated that APRI was an appropriate irrigation method in processing tomato plantation in arid desert area such as Xinjiang, as high irrigation quota of APRI (APRIH) significantly improved its yield without fruit quality reduction in comparison with those of CDI. However, the yield without fruit quality of FPRI significantly decreased. Even if the irrigation quota of APRI decreased to the medium level (APRIM, 51.6 mm), iWUE by increased 31.8–32.7% on the contrary, as irrigation water was saved by 23.6%; while keeping the yield and fruit quality. Therefore, APRIM is recommended for processing tomato plantation in arid northwest China, to increase plant growth, fruit quality, yield, and iWUE synergistically.

scholarly journals The corps’ growth with different water-saving irrigation conditions in new reclamation areas along the coast of Jiangsu

2019 ◽  
Vol 118 ◽  
pp. 03044
Author(s):  
Jun Wang ◽  
Songgan Weng ◽  
Tongshun Wang ◽  
Xing Yang ◽  
Miao Hou ◽  
...  
Keyword(s):  
Water Resources ◽  
Fresh Water ◽  
Quantitative Evaluation ◽  
Irrigation Water ◽  
Drip Irrigation ◽  
Water Saving ◽  
Green Pepper ◽  
Spray Irrigation ◽  
Important Means ◽  
The Impact

This study performed a quantitative evaluation of the impact of the corps’ growth with different water-saving irrigation conditions in new reclamation areas along the coast of Jiangsu. In this work, the yield and the amount of irrigation water of corps’ (watermelon, green pepper, and rice) with different water-saving irrigation modes were investigated. The results indicate that the drip-irrigation and micro-spray irrigation can observably reduce the amount of irrigation-water. With respect to normal irrigation, the rate of water-saving is 39.2%. At the same time, there’s been some improvement in the yield of corps. Water-saving irrigation can been accepted as an important means for alleviating the shortage of fresh water resources in the new reclamation.

scholarly journals Evaluation of Irrigation Methods for Highbush Blueberry—I. Growth and Water Requirements of Young Plants

HortScience ◽  
2011 ◽  
Vol 46 (1) ◽  
pp. 95-101 ◽  
Author(s):  
David R. Bryla ◽  
Jim L. Gartung ◽  
Bernadine C. Strik
Keyword(s):  
Water Use ◽  
Irrigation Water ◽  
Drip Irrigation ◽  
Dry Weight ◽  
Vaccinium Corymbosum ◽  
The Other ◽  
Highbush Blueberry ◽  
Water Requirements ◽  
Irrigation Methods ◽  
Irrigation Water Use

A study was conducted in a new field of northern highbush blueberry (Vaccinium corymbosum L. ‘Elliott’) to determine the effects of different irrigation methods on growth and water requirements of uncropped plants during the first 2 years after planting. The plants were grown on mulched, raised beds and irrigated by sprinklers, microsprays, or drip at a rate of 50%, 100%, and 150% of the estimated crop evapotranspiration (ETc) requirement. After 2 years, drip irrigation at 100% ETc produced the most growth among the irrigation methods with at least 42% less water than needed for maximum growth with microsprays and 56% less water than needed with sprinklers. Drip irrigation also maintained higher soil water content in the vicinity of the roots than the other methods but reduced growth when plants were over-irrigated at 150% ETc. Only 570 mm of irrigation water, or the equivalent of 1320 L per plant, was required over two seasons to reach maximum total plant dry weight with drip, whereas 980 mm or more water was needed with sprinklers and microsprays. Consequently, irrigation water use efficiency (defined as the difference in plant biomass produced under irrigated and rain-fed conditions divided by the total amount of irrigation water applied) was significantly higher with drip than with the other irrigation methods, averaging 0.41 g of total dry weight per liter of drip irrigation. In terms of both growth and water use, drip irrigation was the best and most efficient method to establish the plants.

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