scholarly journals Water supply intensity during drip irrigation of vegetable crops

2021 ◽  
Vol 282 ◽  
pp. 05008
Author(s):  
S.A. Kurbanov ◽  
M.M. Dzhambulatov ◽  
V.V. Borodychev ◽  
D.S. Magomedova
Keyword(s):  
Flow Rate ◽  
Drip Irrigation ◽  
Sandy Loam ◽  
Soil Layer ◽  
Field Research ◽  
Moisture Regime ◽  
Vegetable Crops ◽  
Irrigation Rate ◽  
Chestnut Soils ◽  
Irrigation Water Use

The paper presents the materials of field research on the study of the regularities of the development of moisture outlines on light soils during drip irrigation of vegetable crops. The correlation is found between the depth of the moistened layer and the area of the moistening outlines on the pre-irrigation threshold of the moisture content of the active soil layer, irrigation standards and the flow rate of drippers, which gives an opportunity to decline the unproductive water consumption for filtration. It is found that in light loamy and sandy loam light chestnut soils, for guaranteed rule of the moisture regime, on onion crops, it is essential to maintain the pre-irrigation threshold of 80% HB with the irrigation rate of 200 m3 / ha with the flow rate of drip water outlets of 2.8 l / h, and the depth of irrigation of 120 m3/ha with the flow rate of discharge outlets of 1.7 l/h, correspondingly. In irrigation of tomatoes grown on light-loamy light-chestnut soils, it is appropriate to apply the irrigation rate of 180 m3 / ha, which provides the level of pre-irrigation humidity in the layer of 0.6 m not lower than 80% HB, the formation of the required characteristics of the moisture contour (depth of 0.62 m and diameter of 0.37 m), as well as an enhance in the efficiency of irrigation water use by 11.1%. The results can be applied in the design of drip irrigation systems for vegetable crops.

scholarly journals The efficiency of different moisture and nutrition conditions in early potato growing under drip irrigation in southern Ukraine

2021 ◽  
Vol 66 (1) ◽  
pp. 1-16
Author(s):  
Raisa Vozhehova ◽  
Galina Balashova ◽  
Liubov Boiarkina ◽  
Olesya Yuzyuk ◽  
Sergey Yuzyuk ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Field Research ◽  
Early Potato ◽  
Average Yield ◽  
Irrigation Rate ◽  
The Third ◽  
Additional Control ◽  
Moisture Conditions ◽  
Tuber Treatment ◽  
Southern Ukraine

The article presents field research results on the effectiveness of different moisture and nutrition conditions at the cultivation of early potato under drip irrigation in southern Ukraine. The scheme of the experiment included the treatment with the complex Mochevyn K as an additional control and different methods and correlation of fertilizers Plantafol (treatment of tubers before planting, fertilizing, at budding and their combination), as well as different soil moisture conditions (irrigation rates of 100 and 200 m?/ha). Studies have shown that the average yield of early potato without irrigation was 10.44 t/ha. Moisture conditions significantly affected the yield of young tubers - irrigation at a rate of 200 m?/ha provided 21.61 t/ha, whereas reducing the irrigation rate to 100 m?/ha led to a decrease in yield - 19.86 t/ha. The first treatment of planting tubers, treatment of plants at sprouting and during budding provided almost the same yield. The second and the third treatments of plants and tubers did not lead to a significant increase in yield. The highest productivity of potato was provided by Plantafol treatment of tubers and combination of tuber treatment with foliar feeding at mass sprouting phase with a 200 m?/ha irrigation rate for two years: 24.16 and 23.22 t/ha.

scholarly journals The Effect of Variations in Drainage on Infiltration Rates in Pore Cylindrical Drainage

2021 ◽  
Vol 2 (3) ◽  
pp. 33-39
Author(s):  
Nhi Thrinch ◽  
Honh Thung
Keyword(s):  
Flow Rate ◽  
Sandy Loam ◽  
Soil Layer ◽  
Drainage System ◽  
Laboratory Studies ◽  
Infiltration Rates ◽  
Catchment Areas ◽  
Subsurface Soil ◽  
The Impact

Inundation and floods are caused by a combination of factors including lower rain catchment areas, decreasing infiltration rates, and an uneven distribution of rainfall throughout the year, which all combine to create flooding and inundation issues. The alternative option is to install an efficient drainage system that is ecologically friendly, since in addition to its role of accommodating and draining water, it also has the additional purpose of absorbing water into the subsurface soil layer. A pore hole is created at the bottom of the drainage channel in order for the water to be absorbed. There was a desire to investigate the impact of soil texture on the rate of infiltration, therefore this research was conducted. Three kinds of soil were utilized as infiltration medium, namely sandy loam, loam, and clayey loam, all of which were found in the surrounding area. In addition, there are three variants of hole spacing, namely 16 cm, 32 cm, and 48 cm, as well as three variations of flow rate, namely 400 cm3/s, 1500 cm3/s, and 2500 cm3/s, among others. As a consequence of laboratory studies, it has been shown that the impact of changes in flow rate on infiltration discharge is inversely proportional to the flow rate, i.e., the higher the flow rate, the smaller the infiltration discharge that occurs. The reason for this is because it is influenced by the flow velocity

scholarly journals Evaluation of Shallow Subsurface Drip Irrigation for the Production of Acorn Squash

2016 ◽  
Vol 26 (4) ◽  
pp. 436-443 ◽  
Author(s):  
Timothy Coolong
Keyword(s):  
Water Use ◽  
Drip Irrigation ◽  
Block Design ◽  
Irrigation Treatment ◽  
Subsurface Drip Irrigation ◽  
Vegetable Crops ◽  
Set Point ◽  
Irrigation Water Use ◽  
Subsurface Drip ◽  
The Impact

Subsurface drip irrigation (SDI) has been increasingly used for the production of numerous agronomic crops and a limited number of vegetable crops. To determine the impact of SDI compared with surface drip irrigation (SUR), a study was conducted in 2011 and 2012 with ‘Table Queen’ acorn squash (Cucurbita pepo var. turbinata) with irrigation initiated at 75% and 50% plant available water (PAW). The study was arranged as a factorial randomized complete block design and plants were grown with two irrigation types (SUR or SDI) and two tensiometer-controlled irrigation regimes. Results from 2011 suggested that SDI used less water compared with SUR at each irrigation set point. However, in 2012, significantly more water was used in all treatments due to warmer temperatures and less rainfall. In 2012, SDI used more water than SUR treatments at the same irrigation set point. In 2012, yield was affected by irrigation treatment. Plants grown using SUR irrigating at 75% PAW had greater numbers of fruit compared with other treatments. Furthermore, the highest yielding treatment had more than twice the number of irrigation events than the other treatments though the average lengths of irrigation events were shorter. Although overall yields were greater in 2012, irrigation water use efficiency (iWUE) was lower than in 2011 due to increased water use. These results suggest that while SDI may have some advantages over traditional SUR, environmental factors during growth can significantly impact the efficiency and productivity of each system.

scholarly journals Irrigation scheduling strategies for pepper based on evaporation and reference evapotranspiration

2021 ◽  
Vol 26 (51) ◽  
pp. 69-76
Author(s):  
Borivoj Pejić ◽  
Ivana Bajić ◽  
Ksenija Mačkić ◽  
Dušanka Bugarski ◽  
Slobodan Vlajić ◽  
...  
Keyword(s):  
Reference Evapotranspiration ◽  
Soil Layer ◽  
Open Water ◽  
Irrigation Scheduling ◽  
Climatic Conditions ◽  
Vegetable Crops ◽  
Irrigation Water Use ◽  
Evapotranspiration Rate ◽  
Crop Coefficients ◽  
Novi Sad

The experiment with drip irrigated pepper was conducted at the Rimski Šančevi experimental field of the Institute of Field and Vegetable Crops in Novi Sad in 2019. The irrigation was scheduled on the basis of the water balance method. Two methods were used to compute the daily evapotranspiration of pepper (ETd): reference evapotranspiration (ETo) and evaporation from an open water surface (Eo). Crop coefficients (kc) and corrective coefficients (k) were used to convert ETo and Eo values into ETd. Kc and k were 0.3-0.4, 0.6-0.7, 0.9-1.1, 0.8-0.9 and 0.4, 0.7, 1.0 and 0.8 for initial stage, crop development, mid season, and late season, respectively. ETo was calculated by the Hargreaves equation. Eo values were measured by a Class-A pan located at a meteorological station near the experimental plot. Irrigation started when readily available water (RAW) in the 0.3 m soil layer was completely absorbed by plants. Differences in crop yield (Y) and irrigation water use efficiency (IWUE) obtained using Eo (42.58 t ha-1, 15.20 kg m-3) and ETo (40.78 t ha-1, 14.56 kg m-3) were not statistically different. Evapotranspiration rate was 364.2 mm and 337.3 mm in Eo and ETo variant, respectively. The fact that the differences in Y and IWUE between different calculations of ETd were not statistically significant indicates that both methods can be recommended for irrigation scheduling programs for pepper in the climatic conditions of the Vojvodina region. However, priority should be given to ETo due to the easy accessibility and reliability of data.

scholarly journals OBSTRUÇÃO DE GOTEJADORES AUTOCOMPENSANTES ENTERRADOS NA IRRIGAÇÃO DE CITROS CAUSADA POR INTRUSÃO RADICULAR

Irriga ◽  
2007 ◽  
Vol 12 (3) ◽  
pp. 393-408
Author(s):  
Rubens Duarte Coelho ◽  
Luis Fernando Faria ◽  
Ralini Ferreira de Melo
Keyword(s):  
Flow Rate ◽  
Drip Irrigation ◽  
Soil Layer ◽  
Root Penetration ◽  
Rate Variation ◽  
Rate Reduction ◽  
Irrigation Level ◽  
Potted Plants ◽  
Irrigation Flow ◽  
Subsurface Drip

OBSTRUÇÃO DE GOTEJADORES AUTOCOMPENSANTES ENTERRADOS NA IRRIGAÇÃO DE CITROS CAUSADA POR INTRUSÃO RADICULAR  Rubens Duarte Coelho; Luis Fernando Faria; Ralini Ferreira de MéloDepartamento de Engenharia Rural, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Piracicaba, SP,  [email protected]  1 RESUMO Este trabalho teve como objetivo obter informações sobre o desempenho de gotejadores enterrados (irrigação subsuperficial), quanto à susceptibilidade dos modelos autocompensantes a intrusão radicular baseado na variação de vazão para a cultura do Citros. As mudas de Citros foram irrigadas por sete modelos diferentes de gotejadores de fluxo autocompensante, instalados a duas profundidades (15 e30 cmda superfície do solo) e em dois níveis de depleção de água no solo (tratamentos úmido e seco). O trabalho foi conduzido em vasos e sob ambiente controlado, utilizando mudas de laranjeira Pêra com enxerto de tangerina Cleópatra em estágio inicial de desenvolvimento. Observaram-se até os 120 dias no início do experimento diferenças de desempenho entre os modelos de emissores ensaiados quanto à penetração de raízes e maior instabilidade de vazão, na presença de raízes e partículas de solo, podendo-se agrupar os modelos avaliados em função do grau de redução de vazão observado. Os tratamentos com diferentes níveis de depleção de água no solo (úmido e seco) não diferiram estatisticamente até 120 dias do início do experimento, porém, notou-se que o sistema radicular do Citros foi mais agressivo na profundidade de solo de30 cm  para o tratamento com maior umidade no solo (úmido). UNITERMOS: gotejamento, variação de vazão, profundidade  COELHO, R. D.; FARIA, L. F.; MELO, R.F. de. OBSTRUCTION OF SELF-COMPENSATED EMITTERS IN SUBSURFACE DRIP CITRUS  IRRIGATION (ROOT INTRUSION - SDI)  2 ABSTRACT This work aimed to quantify dripper performance under subsurface drip irrigation (SDI), regarding flow rate variation due to the intrusion of citros roots.  Potted plants were irrigated by seven different models of self-compensated commercial drippers, at two depths (15 and 30 cm) and two soil water depletion levels (wet and dry treatments). After 120 days from the beginning of the experiment it was possible to identify different performances among studied models, related to the root penetration. It was possible to classify dripper models in relation to the degree of flow rate reduction; the irrigation level treatments did not present conclusive results until 120 days of the beginning of the experiment; however, considering the whole period of the experiment evidences, it was observed that the root system was more aggressive in the deepest soil layer (30 cm) and for the wet treatment.   KEYWORDS: drip irrigation, flow variation, depths

TOMATO YIELD AS RELATED TO DRIP LATERAL SPACING AND FERTILIZER APPLICATION ON TOTAL AND WETTED AREA BASIS

1989 ◽  
Vol 69 (3) ◽  
pp. 991-999 ◽  
Author(s):  
S. D. SINGH ◽  
Y. V. SINGH ◽  
R. C. BHANDARI
Keyword(s):  
Root Growth ◽  
Surface Area ◽  
Drip Irrigation ◽  
Soil Layer ◽  
High Water Content ◽  
Root Weight ◽  
Moisture Regime ◽  
Area Basis ◽  
Wetted Area ◽  
Wetted Surface Area

With drip irrigation systems, a part of the area is wetted at the soil surface. This raises the question of whether to program fertilizer rates on the total or wetted area of the plot. The objective of this investigation was to study the response of unstaked tomato plants (Lycopersicon lycopersicum L. Karst.) to drip application of fertilizers on the basis of total versus wetted surface area. Apart from the conventional broadcast and drip application of NPK fertilizers in liquid form, four other treatments were applied consisting of two rates of NPK, i.e., 224, 88 and 168 kg ha−1 on total plot area basis, and 56, 22 and 42 kg ha−1 on wetted surface area basis, factorially combined with 1.2- and-2.4-m lateral spacings, with N through drip, P and K banded. The study also included drip irrigation at 1.0 and 0.5 times the daily evapotranspiration (ET) rate factorially combined with drip application of NPK at 1.0, 0.75 and 0.5 times and broadcast application at 1.0 times the NPK rate. The NPK were, respectively, at 224, 88 and 168 kg ha−1. At the full grown stage, available water in the plant root zone was 60–100%. Root growth, soil temperature, and thermal conductivity were positively influenced by canopy cover and soil moisture regime. The development pattern indicated that 74% of the total root weight was confined to the top 15-cm soil layer. At the time of fruiting, the root weight declined in the soil layer with high water content. Drip irrigation equal to 0.5 ET required 25% less fertilizer than irrigation equal to ET, but irrigation at the latter rate and application of fertilizers to supply 224, 88 and 168 kg ha−1 of NPK, respectively, gave the highest yield of 90 t ha−1.Key words: Drip irrigation, root growth, spacing, multiple rows, fertilizer

Study of the wet bulb in drip irrigation in stratified soils using HYDRUS

2020 ◽  
Author(s):  
José Roldán Cañas ◽  
Antonio Jesús Zapata Sierra ◽  
Rafael Reyes Requena ◽  
María Fátima Moreno Pérez
Keyword(s):  
Drip Irrigation ◽  
Sandy Loam ◽  
Soil Layer ◽  
Small Variation ◽  
Original Material ◽  
Se Spain ◽  
Horticultural Crops ◽  
Greenhouse Soils ◽  
Irrigation Control ◽  
Definition Of

<p>The “enarenado” (sand-covering soil) is a technique used in greenhouses located in the southeast of Spain that consists of placing a layer of soil between 20 and 40 cm above the original material, a thin layer of organic matter and above it a layer of sand of about 5 to 10 cm.</p><p>It is necessary to know the shape of the wet bulb produced by the emitters for a correct design and management of the drip irrigation systems. In stratified soils, as in the case of “enarenado” soils, the distribution of water can change substantially with respect to the case of homogeneous soils. The objective of this work is to present the methodology of data acquisition and the actions carried out so far to obtain a model that precisely defines the evolution of humidity in wet bulbs generated in “enarenado” soils characteristic of intensive horticultural crops.</p><p>The tests have been carried out at the facilities of the IFAPA Center La Mojonera, Almería, SE Spain. The textures of the added soils are sandy loam and clay loam, representative of the horticultural crops of Almeria. The crop was pepper , Mazo variety, planted on September 15, 2018 in the two selected greenhouses. The irrigation is automatic, with drippers of nominal flow Qn = 3 l / h, self-compensating, anti-drainage of Netafim. Irrigation control is carried out using classic tensiometers with built-in pressure transducer.</p><p>The humidity has been measured at 10 points distributed around a dripper, 7 probes at 5 cm deep in the added soil layer and 3 probes at 18 cm depth, near the original soil layer. The sensor used is TE5 Decagon. The plantation frame coincides with that of the drippers, Sg = 50 cm and Sr = 120 cm, for this reason the probes were placed up to half of the plantation frame.</p><p>The data collected show a small variation in humidity over time. That is, the added soil, with a clayey texture, quickly redistributes moisture and the probes register very small variations.</p><p>Once the values specified in the methodology have been measured, the theoretical humidity retention curves of greenhouse soils have been calibrated. With the data collected, the system has been simulated by completing the fields that the Hydrus model needs. This operation has been specified in the definition of a simple, multi-layered 3D model. In general, the model predicts moisture behavior well in the conditions set.</p>

scholarly journals Assessment of Seasonal Variability in Soil Nutrients and Its Impact on Soil Quality under Different Land Use Systems of Lower Shiwalik Foothills of Himalaya, India

2021 ◽  
Vol 13 (3) ◽  
pp. 1398
Author(s):  
Tavjot Kaur ◽  
Simerpreet Kaur Sehgal ◽  
Satnam Singh ◽  
Sandeep Sharma ◽  
Salwinder Singh Dhaliwal ◽  
...  
Keyword(s):  
Land Use ◽  
Soil Quality ◽  
Surface Soil ◽  
Sandy Loam ◽  
Monsoon Season ◽  
Soil Layer ◽  
Seasonal Effects ◽  
Land Use Systems ◽  
Post Monsoon ◽  
Significant Difference

The present study was conducted to investigate the seasonal effects of five land use systems (LUSs), i.e., wheat–rice (Triticum aestivum—Oryza sativa) system, sugarcane (Saccharum officinarum), orange (Citrus sinensis) orchard, safeda (Eucalyptus globules) forest, and grassland, on soil quality and nutrient status in the lower Satluj basin of the Shiwalik foothills Himalaya, India. Samples were analyzed for assessment of physico-chemical properties at four soil depths, viz., 0–15, 15–30, 30–45, and 45–60 cm. A total of 120 soil samples were collected in both the seasons. Soil texture was found to be sandy loam and slightly alkaline in nature. The relative trend of soil organic carbon (SOC), macro- and micro-nutrient content for the five LUSs was forest > orchard > grassland > wheat–rice > sugarcane, in the pre- and post-monsoon seasons. SOC was highly correlated with macronutrients and micronutrients, whereas SOC was negatively correlated with soil pH (r = −0.818). The surface soil layer (0–15 cm) had a significantly higher content of SOC, and macro- and micro-nutrients compared to the sub-surface soil layers, due to the presence of more organic content in the soil surface layer. Tukey’s multiple comparison test was applied to assess significant difference (p < 0.05) among the five LUSs at four soil depths in both the seasons. Principle component analysis (PCA) identified that SOC and electrical conductivity (EC) were the most contributing soil indicators among the different land use systems, and that the post-monsoon season had better soil quality compared to the pre-monsoon season. These indicators helped in the assessment of soil health and fertility, and to monitor degraded agroecosystems for future soil conservation.

Sign in / Sign up

Export Citation Format

Share Document