scholarly journals Evapotranspiration and crop coefficient of basil determined by weighing lysimeters

2019 ◽  
Vol 37 (4) ◽  
pp. 373-378
Author(s):  
Izabela P Martins ◽  
Rogério T de Faria ◽  
Luiz F Palaretti ◽  
Miquéias G dos Santos ◽  
João Alberto Fischer Filho
Keyword(s):  
Crop Coefficient ◽  
Human Consumption ◽  
Crop Evapotranspiration ◽  
Area Index ◽  
Reference Crop Evapotranspiration ◽  
Daily Evapotranspiration ◽  
Cover Ratio ◽  
Crop Coefficients ◽  
Reference Crop ◽  
Monteith Equation

ABSTRACT The basil (Ocimum basilicum) crop is of great importance for trading as fresh or dried condiment for human consumption and essential oil for pharmaceutical and cosmetic industries. Water excesses and deficits can affect biomass production of plants, making it necessary to use the correct amount of water for each crop. Considering that determinations of water consumption and cultivation coefficients for medicinal plants are scarce, the aim of this study was determining evapotranspiration and crop coefficients of basil using lysimeters. The crop evapotranspiration was determined by weighing lysimeters for the replacements of 100, 75 and 50% of the maximum daily evapotranspiration. The reference crop evapotranspiration was estimated by the Penman-Monteith equation. Crop evapotranspiration for the 49 day cycle was 471, 352 and 236 mm, and daily rates ranged from 4.8 to 9.4; 4 to 8.1 and 3.7 to 7.4 mm/day, for the replacements of 100, 75 and 50% of the maximum daily evapotranspiration. Crop coefficients varied from 1.5 to 2.8 and were related to the days after transplanting, leaf area index, cover ratio and cumulative degrees-day.

Study on Regional Analysis of Reference Crop Evapotranspiration Based on SPSS

2015 ◽  
Vol 733 ◽  
pp. 415-418
Author(s):  
Li Ying Cao ◽  
He Long Yu ◽  
Gui Fen Chen ◽  
Peng Sun
Keyword(s):  
Regression Analysis ◽  
Linear Regression ◽  
Linear Correlation ◽  
Meteorological Data ◽  
Linear Regression Analysis ◽  
Regional Analysis ◽  
Crop Evapotranspiration ◽  
Reference Crop Evapotranspiration ◽  
Reference Crop ◽  
Monteith Equation

Based on the meteorological data collected from 3 stations in recent 10 years in Fushun region, the reference crop evapotranspiration was calculated with the Penman-Monteith equation recommended by FAO in 1990. The evapotranspiration of the region was analyzed using linear regression analysis based on software of SPSS. The results showed that the linear correlation was evident between the evapotranspiration data of stations, but it is not significant for the linear correlation between the stations, neither between the stations. The result will be helpful to analysis of the space distributions of the reference crop evapotranspiration in the region.

scholarly journals Characterization of a “New Greenhouse Model”: with and without insect proof-screen

2017 ◽  
Vol 11 ◽  
Author(s):  
Luigi Santonicola ◽  
Antonietta Napolitano ◽  
Francesco Castelluccio ◽  
Barbara Greco ◽  
Michele De Maio ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Dry Matter ◽  
Natural Ventilation ◽  
Crop Evapotranspiration ◽  
Fresh Matter ◽  
Area Index ◽  
Reference Crop Evapotranspiration ◽  
Plant Parts ◽  
Reference Crop

In the " Natural ventilation greenhouse", patented new greenhouse model which maximizes the natural ventilation and allows stable installation of the anti-insect proof-screen. The effects of the presence or absence of the anti-insect proof-screen are compared on different parameters of the soil (moisture, pH, EC (Electrical Conductivity), nitrates), of greenhouse environment (irradiance, Hargreaves-Samani ETo (reference crop evapotranspiration)) and of plant (fresh matter, dry matter, Leaf Area Index (LAI)). The presence of the insect proofscreen reduces the water needs of tomato, in fact soil moisture, water delivered and ETo are significantly lower compared to the greenhouse without an insect proof-screen, also it reduces the EC and nitrates in the soil. It improves LAI, doubles the amount of fresh matter of plant parts and triples the fresh matter of the productive part with respect to the greenhouse without anti-insect proof-screen.

Comparative evaluation of actual evapotranspiration of capsicum inside and outside of naturally ventilated polyhouse

2020 ◽  
Vol 44 (04) ◽  
pp. 14-21
Keyword(s):  
Soil Moisture ◽  
Comparative Evaluation ◽  
Meteorological Parameters ◽  
Reference Evapotranspiration ◽  
Crop Coefficient ◽  
Weather Data ◽  
Crop Evapotranspiration ◽  
Reference Crop Evapotranspiration ◽  
The Relationship ◽  
Reference Crop

This study was conducted to study the relationship between capsicum crop evapotranspiration inside (ETCin) and crop evapotranspiration outside (ETCout) the naturally ventilated polyhouse (NVPH) using meteorological parameters. Polyhouse has a straightway impact on air temperature and relative humidity while it indirectly influences soil temperature and soil moisture inside the structure. Under this study, crop evapotranspiration was estimated by conventional method i.e., obtaining reference evapotranspiration from weather data recorded inside the polyhouse and multiplying it with crop coefficient values of capsicum crop. Reference crop evapotranspiration inside and outside the polyhouse found as 745.19 mm and 590.22 mm, respectively whereas capsicum crop evapotranspiration inside and outside the polyhouse was 868.40 mm and 694.16 mm, respectively. The results of the study revealed that the relationship between weekly ETCin and ETCout can be expressed mathematically as ETCin = 0.84 ETCout. This implies that, there was approximately 15 % lower crop evapotranspiration requirement for the capsicum crop inside the naturally ventilated polyhouse as compared to outside the polyhouse.

scholarly journals An assessment of the water requirements of a mountain pasture sward in the Polish Western Carpathians

2011 ◽  
Vol 15 (1) ◽  
pp. 193-208 ◽  
Author(s):  
Antoni Kuźniar ◽  
Stanisław Twardy ◽  
Agnieszka Kowalczyk ◽  
Marek Kostuch
Keyword(s):  
Surface Resistance ◽  
Meteorological Data ◽  
Crop Coefficient ◽  
Western Carpathians ◽  
Crop Evapotranspiration ◽  
Water Requirements ◽  
Reference Crop Evapotranspiration ◽  
Mountain Pasture ◽  
Weather Stations ◽  
Reference Crop

An assessment of the water requirements of a mountain pasture sward in the Polish Western Carpathians The water requirements of the pasture sward using the Penman-Monteith method (FAO-56), which is seldom applied in Poland, was assessed. The reference crop evapotranspiration ETo from a hypothetical grass crop with an assumed crop height of 0.12 m, a fixed surface resistance of 70 s·m-1 and an albedo of 0.23, was used. These assumptions are similar under conditions of ruminant grazing. ETo was computed by using meteorological data from 43 weather stations. The crop evapotranspiration ETc is the product of ETo, and single crop coefficient Kc. The differences between precipitation and ETo and ETc (climatic water balances) were determined for mountain pastures. The results were summarised form of a table and maps of isohyets and isolines elaborated by applying the Geographic Information System techniques (Arc View 9) with the data interpolated by the geostatic method (Kriging).

scholarly journals Necesidades hídricas de estevia calculadas con el coeficiente del cultivo

2017 ◽  
Vol 28 (2) ◽  
pp. 509
Author(s):  
Martha Constanza Daza Torres ◽  
Hugo Stiven Meneses Carvajal ◽  
Aldemar Reyes Trujillo ◽  
Norberto Urrutia Cobo
Keyword(s):  
Growth Stage ◽  
Stevia Rebaudiana ◽  
Crop Coefficient ◽  
Field Capacity ◽  
Drainage Water ◽  
Mature Stage ◽  
Crop Evapotranspiration ◽  
Stevia Rebaudiana Bertoni ◽  
Valle Del Cauca ◽  
Monteith Equation

This study aimed to determine the crop coefficient (Kc) curve for stevia (Stevia rebaudiana Bertoni) in Candelaria, Valle del Cauca, Colombia. The experiment was conducted during the first half of 2015. In a plot planted with stevia, were located three drainage lysimeters arranged randomly and a portable weather station to determine climatic variables necessary for calculating an evapotranspiration reference (ETo), using the Penman Monteith equation. Soil eld capacity moisture was determined and regular monitoring of both, soil moisture and drainage water depth were performed. Irrigation was applied using an exhaustion coefficient of 10% to bring it back to field capacity moisture. Statistical analyzes were performed and Kc was calculated from the ratio of crop evapotranspiration (ETc) to ETo, for each plant in phenological phase. With condidence of 95% Kc for stevia were: growth stage (54 days after transplantation, ddt) 0.86 ± 0.12, mature stage (55-72 ddt) 1.24 ± 0.10 and senescence stage (72-96 ddt) 0.85 ± 0.14. Water consumption of Stevia rebaudiana B., was 4753 m3/ha during its growing cycle of 96 days after transplantation. 

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