scholarly journals Influence of different protected cultivation structures on performance of cucumber (Cucumis sativus L.) in Indian hot arid region

2021 ◽  
Vol 23 (3) ◽  
pp. 265-271
Author(s):  
P.S. KHAPTE ◽  
H.M. MEENA ◽  
PRADEEP KUMAR ◽  
UDAY BURMAN ◽  
ANURAG SAXENA ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Plant Growth ◽  
Air Temperature ◽  
Arid Region ◽  
Arid Regions ◽  
Physiological Activity ◽  
Cucumis Sativus L ◽  
Active Radiation ◽  
Protected Cultivation ◽  
Greenhouse Cucumber

The performance of gynoecious cucumber (cv. Terminator) was evaluated under three protected structures viz., naturally ventilated polyhouse (NVP), insect proof net house (INH) and shade net house (SNH) at Jodhpur, Rajasthan in hot arid region of India. The photosynthetically active radiation (PAR) inside these structures during cropping period ranged from 154-842 μmol m-2 s-1 which was much lower than the outside. Among structures, air temperature was 1.2°C and 0.7°C lower while relative humidity (RH) was 17 and 4 per cent higher in NVP and SNH respectively as compared to INH. Relatively low air as well as soil temperature, coupled with high RH and optimal radiation in NVP led to better plant growth and physiological activity which resulted in 42 and 142per cent higher yield than INH and SNH, respectively. Hence, it can be recommended that NVP is the best low-tech protected structure which modifies the microclimate favouring successful cultivation of greenhouse cucumber in Indian hot arid regions.

scholarly journals Microclimate Condition in the Natural Ventilated Greenhouse

2020 ◽  
Vol 44 (1) ◽  
pp. 31
Author(s):  
Vita Ayu Kusuma Dewi ◽  
Budi Indra Setiawan ◽  
Roh Santoso Budi Waspodo ◽  
Liyantono Liyantono
Keyword(s):  
Relative Humidity ◽  
Solar Radiation ◽  
Plant Growth ◽  
Air Temperature ◽  
Environmental Engineering ◽  
Primary Data ◽  
Climate Factors ◽  
Second Stage ◽  
Two Stages ◽  
Determining Factor

A Greenhouse has a different microclimate compared to the outside field. Climate parameters such as solar radiation and air temperature are important parameters that affect plant growth and productivity. This research aims to understand the relation of climate factors in the inside and outside Greenhouse, the effect of microclimate on evapotranspiration and to predict the amount og evapotranspiration inside the Greenhouse. Microclimate analysis was held in two stages, the firststage was from February 5 to March 21, 2018 and the second stage from March 19 to April 29, 2019 at the Department of Civil and Environmental Engineering, IPB University. Primary data was measured by the Decagon sensor. Solar radiation was collected using the Decagon PYR Pyranometer sensor and air temperature using the Decagon VP-4 sensor. Based on the result, the daily air temperature inside the Greenhouse was higher than that of the outside. The inside solar radiation was lower than that of outside the Greenhouse. The relative humidity fluctuated, and the air pressure was higher inside the Greenhouse. Evapotranspiration inside the Greenhouse was lower than outside and solar radiation was the most determining factor of evapotranspiration.

scholarly journals Microclimate under different shading screens in greenhouses cultivated with bromeliads

2012 ◽  
Vol 16 (8) ◽  
pp. 858-863 ◽  
Author(s):  
Ester Holcman ◽  
Paulo C. Sentelhas
Keyword(s):  
Relative Humidity ◽  
Solar Radiation ◽  
Air Temperature ◽  
Photosynthetically Active Radiation ◽  
External Condition ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Net Radiation ◽  
Active Radiation ◽  
Incoming Solar Radiation

This study had as its objective the evaluation of the influence of shading screens of different colors on the different microclimate variables in a greenhouse covered with transparent low-density polyethylene (LDPE). The experiment was conducted with five treatments: thermo-reflective screen (T1); a control - without screen (T2); red screen (T3); blue screen (T4); and black screen (T5), all of them with 70% of shading. An automatic micrometeorological station was installed in each treatment, measuring air temperature (T), relative humidity (RH), incoming solar radiation (Rg), photosynthetically active radiation (PAR) and net radiation (Rn) continuously. The control (T2) and red screen (T3) treatments promoted the highest solar radiation transmissivity, respectively 56.3 and 27%. The black screen (T5) had the lowest solar radiation transmissivity (10.4%). For PAR and Rn the same tendency was observed. The highest temperature was observed under blue screen (T4) treatment, which was 1.3 °C higher than external condition. Blue screen (T4) treatment also presented the highest relative humidity difference between inside and outside conditions.

ENVIRONMENTAL CONDITIONS WITHIN A NORTHERN ONTARIO MINE CONVERTED FOR VEGETABLE PRODUCTION

1982 ◽  
Vol 62 (1) ◽  
pp. 203-210
Author(s):  
M. D. SERBANESCU ◽  
J. D. SHORTHOUSE ◽  
T. H. PETERS
Keyword(s):  
High Pressure ◽  
Relative Humidity ◽  
Plant Growth ◽  
Air Temperature ◽  
Environmental Conditions ◽  
Mercury Vapor ◽  
Adiabatic Compression ◽  
Vegetable Production ◽  
Geothermal Heat ◽  
Northern Ontario

Conditions available for growing vegetables within operating drifts (tunnels) at various levels of the Creighton Mine Number 9 shaft of INCO Metals Company near Sudbury, Ontario are reported. Heat due to adiabatic compression and geothermal heat within drifts 1706.9 m (5600 ft) underground provided an air temperature of 23–29 °C and 15–18 °C at 1219.2 m (4000 ft). Relative humidity, CO2, air quality, and air flow were satisfactory for plant growth. Light was provided by high intensity discharge lamps (metal halide, high pressure sodium, and mercury vapor). Preliminary results indicated that environmental conditions in the drifts were adequate for growth of certain plants.

scholarly journals Microclimate and radiant energy measurements using a novel device for natural resource monitoring

2016 ◽  
Author(s):  
Taylor Thomas ◽  
Adam Wolf
Keyword(s):  
Relative Humidity ◽  
Air Temperature ◽  
Radiant Energy ◽  
Barometric Pressure ◽  
Net Radiation ◽  
Resource Monitoring ◽  
Energy Monitoring ◽  
Active Radiation ◽  
Novel Device ◽  
Natural Resource Monitoring

ABSTRACTA novel device for microclimate and radiant energy monitoring of natural resources was compared to known reference instruments and sensors to gauge relative performance under field conditions in Nebraska and New Jersey, USA during summer 2016. For all measurements tested, including air temperature, relative humidity, barometric pressure, four component net radiation, and photosynthetically active radiation, the device reported values near or within the accuracy limits as stated by the reference instrument / sensor manufacturer.

scholarly journals A New Index Assessing the Viability of PAR Application Projects Used to Validate PAR Models

Agronomy ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 470
Author(s):  
Francisco Ferrera-Cobos ◽  
Jose M. Vindel ◽  
Rita X. Valenzuela
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Relative Humidity ◽  
Air Temperature ◽  
Satellite Data ◽  
Solar Zenith Angle ◽  
The Other ◽  
Clearness Index ◽  
Active Radiation ◽  
Climatic Regions

Photosynthetically active radiation (PAR) is a useful variable to estimate the growth of biomass or microalgae. However, it is not always feasible to access PAR measurements; in this work, two sets of nine hourly PAR models were developed. These models were estimated for mainland Spain from satellite data, using multilinear regressions and artificial neural networks. The variables utilized were combinations of global horizontal irradiance, clearness index, solar zenith angle cosine, relative humidity, and air temperature. The study territory was divided into regions with similar features regarding PAR through clustering of the PAR clearness index (kPAR). This methodology allowed PAR modeling for the two main climatic regions in mainland Spain (Oceanic and Mediterranean). MODIS 3 h data were employed to train the models, and PAR data registered in seven stations across Spain were used for validation. Usual validation indices assess the extent to which the models reproduce the observed data. However, none of those indices considers the exceedance probabilities, which allow the assessment of the viability of projects based on the data to be modeled. In this work, a new validation index based on these probabilities is presented. Hence, its use, along with the other indices, provides a double and thus more complete validation.

scholarly journals Effect of shelterbelt on the microclimate of the gram (Cicer arietinum) crop

MAUSAM ◽  
2021 ◽  
Vol 47 (2) ◽  
pp. 173-178
Author(s):  
RAJ SINGH ◽  
O. P. BISHNOI ◽  
V. U. M. RAO ◽  
DIWAN SINGH
Keyword(s):  
Wind Speed ◽  
Relative Humidity ◽  
Cicer Arietinum ◽  
Air Temperature ◽  
Photosynthetically Active Radiation ◽  
Minimum Temperature ◽  
Radiation Absorption ◽  
Active Radiation ◽  
Maximum Reduction

The shelterbelt influence on the microclimate of gram crop in different intercropping systems comprising of four treatment, viz., pure gram, 1 : 1, 2 : 1 and 4 : 1 gram and raya, was quantified. Albedo varied from 14.8 to 22.6 percent in various treatments with highest value fo 18.3 percent in pure gram treatment, whereas, photosynthetically active radiation absorption was highest in  2 : 1 gram treatment (76%). Maximum reduction (69.2 per cent) in wind speed was observed in  1 : 1 intercropping system at 4h distance from the edge of the shelterbelt in comparison to pure gram field. Relative humidity was 8 to 15 percent less in the sheltered gram as compare to the pure gram, whereas, the average air temperature increased by 1 to 2 C in the sheltered crop over that of the pure gram and this increase was in the range of  9.9 to 12.2 per cent at 4h distance from the edge of shelterbelt. The grass minimum temperature was higher by 0.7degree cent grate in 2 : 1 treatment over that of pure gram during the months of January and February.  

scholarly journals Development of Suitable Microclimate Using Low˗tech Greenhouse for Off-Season Production of High Value Crops in Bangladesh

2021 ◽  
Vol 3 (6) ◽  
pp. 95-103
Author(s):  
M. A. Awal ◽  
P. C. Dhar ◽  
M. H. R. Pramanik
Keyword(s):  
Relative Humidity ◽  
Film Thickness ◽  
Air Temperature ◽  
Photosynthetically Active Radiation ◽  
Crop Production ◽  
Active Radiation ◽  
Horticultural Crops ◽  
Season Extension ◽  
Soil Temperatures ◽  
Solar Noon

Low˗tech greenhouses (low˗techs) have been used globally to cultivate horticultural crops since many years, but their utilization in Bangladesh is a recent phenomenon. Moreover, information on altered microclimate inside the low˗tech is hardly reported. An investigation has been conducted in the Crop Botany Field Laboratory, Bangladesh Agricultural University (24o72´N, 90o43´E and 18 masl), Mymensingh during the late autumn to winter seasons from mid-October to mid-February of 2015/16, 2016/17 and 2017/18 years to find out the variation in microclimatic parameters between inside and outside of low˗techs and to evaluate the suitability of altered microclimate inside the low˗techs for off˗season production of high value crops in Bangladesh. Three low˗techs were erected in each year using bamboo frame covered with single inflated polyethylene film (thickness = 0.2 mm). Major microclimatic parameters inside and aside outside the low˗techs were measured with standard devices or techniques. Around 30 percent incoming photosynthetically active radiation (PAR) was cut˗off by low˗tech cover during solar noon when the sun’s zenith gets minimum value (around 0o). However, this cut˗off portion of PAR was gradually increased with the sunrise and sunset when zenith is around 90o. During the daytime, low˗tech retains higher air temperature than that found at outside and the differences in air temperature between inside and outside of low˗techs was gradually increased after sunrise with a peak difference of 7 to 9 oC following the solar noon (i.e., 13:00-14:00 hour). No distinct variation in relative humidity was recorded between inside and outside of the low˗tech. Low˗tech cover retains higher soil temperature than that was recorded in outside. The variation of both air and soil temperatures between inside and outside of low˗techs was higher during the daytime but lower at nighttime or even at daytime when the sky remained overcast. The variation in microclimatic parameters under low˗techs not only protect the growing crops from climate vagaries during autumn, winter and spring seasons but also provide suitable warmer environment for growing many high value crops during that seasons and thus crop production in off˗season and/or season extension benefits can easily be achieved by low˗techs.

scholarly journals Phenology and vegetative growth of the fig tree cv “Roxo de Valinhos” under a drastic pruning system

2019 ◽  
pp. 426
Author(s):  
T.Y.L. Evangelista, A.C. Miranda, F.A.C.M. Junior ◽  
E.S. Cavalcante ◽  
C.D. Aguiar ◽  
G.A. Pereira
Keyword(s):  
Relative Humidity ◽  
Air Temperature ◽  
Vegetative Growth ◽  
Arid Region ◽  
Climatic Conditions ◽  
Ficus Carica ◽  
Fig Tree ◽  
Semi Arid Region ◽  
Meteorological Elements ◽  
Semi Arid

The phenological adaptability and growth of the fig tree (Ficus carica L.) was observed periodically in the Brazilian semi-arid, State of Piauí, Brazil. The study was done using in 46 plants of the fig tree cv “Roxo de Valinhos”, in Bom Jesus, Piauí in the period from April to August of 2018. The meteorological elements associated with phenology were: air temperature, relative humidity, precipitation, and photoperiod. The results revealed significant relations between the phenology, growth, and climatic conditions showing promising answers for the cultivation of the fig tree cv “Roxo de Valinhos”, in the semi-arid region of Piauí.

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